DS.Errors Class packages/ember-data/lib/system/model/errors.js:13

Holds validation errors for a given record organized by attribute names.

Every DS.Model has an errors property that is an instance of DS.Errors. This can be used to display validation error messages returned from the server when a record.save() rejects. This works automatically with DS.ActiveModelAdapter, but you can implement ajaxError in other adapters as well.

For Example, if you had an User model that looked like this:

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App.User = DS.Model.extend({
  username: attr('string'),
  email: attr('string')
});

And you attempted to save a record that did not validate on the backend.

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var user = store.createRecord('user', {
  username: 'tomster',
  email: 'invalidEmail'
});
user.save();

Your backend data store might return a response that looks like this. This response will be used to populate the error object.

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{
  "errors": {
    "username": ["This username is already taken!"],
    "email": ["Doesn't look like a valid email."]
  }
}

Errors can be displayed to the user by accessing their property name or using the messages property to get an array of all errors.

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{{#each errors.messages}}
  <div class="error">
    {{message}}
  </div>
{{/each}}

<label>Username: {{input value=username}} </label>
{{#each errors.username}}
  <div class="error">
    {{message}}
  </div>
{{/each}}

<label>Email: {{input value=email}} </label>
{{#each errors.email}}
  <div class="error">
    {{message}}
  </div>
{{/each}}
Show:

_findOrCreateMessages

private

_scheduledDestroy

private

Invoked by the run loop to actually destroy the object. This is scheduled for execution by the destroy method.

add

(attribute, messages)

Adds error messages to a given attribute and sends becameInvalid event to the record.

Example:

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if (!user.get('username') {
  user.get('errors').add('username', 'This field is required');
}

Parameters:

attribute String
messages Array|String

addEnumerableObserver

(target, opts)

Registers an enumerable observer. Must implement Ember.EnumerableObserver mixin.

Parameters:

target Object
opts Hash

Returns:

this

addObserver

(key, target, method)

Adds an observer on a property.

This is the core method used to register an observer for a property.

Once you call this method, any time the key's value is set, your observer will be notified. Note that the observers are triggered any time the value is set, regardless of whether it has actually changed. Your observer should be prepared to handle that.

You can also pass an optional context parameter to this method. The context will be passed to your observer method whenever it is triggered. Note that if you add the same target/method pair on a key multiple times with different context parameters, your observer will only be called once with the last context you passed.

Observer Methods

Observer methods you pass should generally have the following signature if you do not pass a context parameter:

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fooDidChange: function(sender, key, value, rev) { };

The sender is the object that changed. The key is the property that changes. The value property is currently reserved and unused. The rev is the last property revision of the object when it changed, which you can use to detect if the key value has really changed or not.

If you pass a context parameter, the context will be passed before the revision like so:

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fooDidChange: function(sender, key, value, context, rev) { };

Usually you will not need the value, context or revision parameters at the end. In this case, it is common to write observer methods that take only a sender and key value as parameters or, if you aren't interested in any of these values, to write an observer that has no parameters at all.

Parameters:

key String
The key to observer
target Object
The target object to invoke
method String|Function
The method to invoke.

any

(callback, target) Boolean

Returns true if the passed function returns true for any item in the enumeration. This corresponds with the some() method in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return the true to include the item in the results, false otherwise.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Usage Example:

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if (people.any(isManager)) { Paychecks.addBiggerBonus(); }

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Boolean
`true` if the passed function returns `true` for any item

anyBy

(key, value) Boolean deprecated

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean
`true` if the passed function returns `true` for any item

beginPropertyChanges

Ember.Observable

Begins a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call this method at the beginning of the changes to begin deferring change notifications. When you are done making changes, call endPropertyChanges() to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

cacheFor

(keyName) Object

Returns the cached value of a computed property, if it exists. This allows you to inspect the value of a computed property without accidentally invoking it if it is intended to be generated lazily.

Parameters:

keyName String

Returns:

Object
The cached value of the computed property, if any

clear

Removes all error messages and sends becameValid event to the record.

Example:

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App.UserEditRoute = Ember.Route.extend({
  actions: {
    retrySave: function(user) {
       user.get('errors').clear();
       user.save();
     }
  }
});

compact

Array

Returns a copy of the array with all null and undefined elements removed.

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var arr = ["a", null, "c", undefined];
arr.compact();  // ["a", "c"]

Returns:

Array
the array without null and undefined elements.

contains

(obj) Boolean

Returns true if the passed object can be found in the receiver. The default version will iterate through the enumerable until the object is found. You may want to override this with a more efficient version.

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var arr = ["a", "b", "c"];
arr.contains("a"); // true
arr.contains("z"); // false

Parameters:

obj Object
The object to search for.

Returns:

Boolean
`true` if object is found in enumerable.

create

(arguments) static

Creates an instance of a class. Accepts either no arguments, or an object containing values to initialize the newly instantiated object with.

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App.Person = Ember.Object.extend({
  helloWorld: function() {
    alert("Hi, my name is " + this.get('name'));
  }
});

var tom = App.Person.create({
  name: 'Tom Dale'
});

tom.helloWorld(); // alerts "Hi, my name is Tom Dale".

create will call the init function if defined during Ember.AnyObject.extend

If no arguments are passed to create, it will not set values to the new instance during initialization:

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var noName = App.Person.create();
noName.helloWorld(); // alerts undefined

NOTE: For performance reasons, you cannot declare methods or computed properties during create. You should instead declare methods and computed properties when using extend or use the createWithMixins shorthand.

Parameters:

arguments

createWithMixins

(arguments) static

Equivalent to doing extend(arguments).create(). If possible use the normal create method instead.

Parameters:

arguments

decrementProperty

(keyName, decrement) Number

Set the value of a property to the current value minus some amount.

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player.decrementProperty('lives');
orc.decrementProperty('health', 5);

Parameters:

keyName String
The name of the property to decrement
decrement Number
The amount to decrement by. Defaults to 1

Returns:

Number
The new property value

destroy

Ember.Object

Destroys an object by setting the isDestroyed flag and removing its metadata, which effectively destroys observers and bindings.

If you try to set a property on a destroyed object, an exception will be raised.

Note that destruction is scheduled for the end of the run loop and does not happen immediately. It will set an isDestroying flag immediately.

Returns:

Ember.Object
receiver

eachComputedProperty

(callback, binding)

Iterate over each computed property for the class, passing its name and any associated metadata (see metaForProperty) to the callback.

Parameters:

callback Function
binding Object

endPropertyChanges

Ember.Observable

Ends a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call beginPropertyChanges() at the beginning of the changes to defer change notifications. When you are done making changes, call this method to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

enumerableContentDidChange

(removing, adding)

Invoke this method when the contents of your enumerable has changed. This will notify any observers watching for content changes. If you are implementing an ordered enumerable (such as an array), also pass the start and end values where the content changed so that it can be used to notify range observers.

Parameters:

removing Ember.Enumerable|Number
An enumerable of the objects to be removed or the number of items to be removed.
adding Ember.Enumerable|Number
An enumerable of the objects to be added or the number of items to be added.

enumerableContentWillChange

(removing, adding)

Invoke this method just before the contents of your enumerable will change. You can either omit the parameters completely or pass the objects to be removed or added if available or just a count.

Parameters:

removing Ember.Enumerable|Number
An enumerable of the objects to be removed or the number of items to be removed.
adding Ember.Enumerable|Number
An enumerable of the objects to be added or the number of items to be added.

errorsFor

(attribute) Array

Returns errors for a given attribute

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var user = store.createRecord('user', {
  username: 'tomster',
  email: 'invalidEmail'
});
user.save().catch(function(){
  user.get('errors').errorsFor('email'); // ["Doesn't look like a valid email."]
});

Parameters:

attribute String

Returns:

Array

every

(callback, target) Boolean

Returns true if the passed function returns true for every item in the enumeration. This corresponds with the every() method in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return the true or false.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Example Usage:

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if (people.every(isEngineer)) { Paychecks.addBigBonus(); }

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Boolean

everyBy

(key, value) Boolean deprecated

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean

everyProperty

(key, value) Boolean deprecated

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean

extend

(mixins, arguments) static

Creates a new subclass.

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App.Person = Ember.Object.extend({
  say: function(thing) {
    alert(thing);
   }
});

This defines a new subclass of Ember.Object: App.Person. It contains one method: say().

You can also create a subclass from any existing class by calling its extend() method. For example, you might want to create a subclass of Ember's built-in Ember.View class:

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App.PersonView = Ember.View.extend({
  tagName: 'li',
  classNameBindings: ['isAdministrator']
});

When defining a subclass, you can override methods but still access the implementation of your parent class by calling the special _super() method:

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App.Person = Ember.Object.extend({
  say: function(thing) {
    var name = this.get('name');
    alert(name + ' says: ' + thing);
  }
});

App.Soldier = App.Person.extend({
  say: function(thing) {
    this._super(thing + ", sir!");
  },
  march: function(numberOfHours) {
    alert(this.get('name') + ' marches for ' + numberOfHours + ' hours.')
  }
});

var yehuda = App.Soldier.create({
  name: "Yehuda Katz"
});

yehuda.say("Yes");  // alerts "Yehuda Katz says: Yes, sir!"

The create() on line #17 creates an instance of the App.Soldier class. The extend() on line #8 creates a subclass of App.Person. Any instance of the App.Person class will not have the march() method.

You can also pass Mixin classes to add additional properties to the subclass.

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App.Person = Ember.Object.extend({
  say: function(thing) {
    alert(this.get('name') + ' says: ' + thing);
  }
});

App.SingingMixin = Mixin.create({
  sing: function(thing){
    alert(this.get('name') + ' sings: la la la ' + thing);
  }
});

App.BroadwayStar = App.Person.extend(App.SingingMixin, {
  dance: function() {
    alert(this.get('name') + ' dances: tap tap tap tap ');
  }
});

The App.BroadwayStar class contains three methods: say(), sing(), and dance().

Parameters:

mixins Mixin
One or more Mixin classes
arguments Object
Object containing values to use within the new class

filter

(callback, target) Array

Returns an array with all of the items in the enumeration that the passed function returns true for. This method corresponds to filter() defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return true to include the item in the results, false otherwise.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Array
A filtered array.

filterBy

(key, value) Array

Returns an array with just the items with the matched property. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

Parameters:

key String
the property to test
value *
optional value to test against.

Returns:

Array
filtered array

filterProperty

(key, value) Array deprecated

Returns an array with just the items with the matched property. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Array
filtered array

find

(callback, target) Object

Returns the first item in the array for which the callback returns true. This method works similar to the filter() method defined in JavaScript 1.6 except that it will stop working on the array once a match is found.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return the true to include the item in the results, false otherwise.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Object
Found item or `undefined`.

findBy

(key, value) Object

Returns the first item with a property matching the passed value. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

This method works much like the more generic find() method.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Object
found item or `undefined`

findProperty

(key, value) Object deprecated

Returns the first item with a property matching the passed value. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

This method works much like the more generic find() method.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Object
found item or `undefined`

forEach

(callback, target) Object

Iterates through the enumerable, calling the passed function on each item. This method corresponds to the forEach() method defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Object
receiver

get

(keyName) Object

Retrieves the value of a property from the object.

This method is usually similar to using object[keyName] or object.keyName, however it supports both computed properties and the unknownProperty handler.

Because get unifies the syntax for accessing all these kinds of properties, it can make many refactorings easier, such as replacing a simple property with a computed property, or vice versa.

Computed Properties

Computed properties are methods defined with the property modifier declared at the end, such as:

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fullName: function() {
  return this.get('firstName') + ' ' + this.get('lastName');
}.property('firstName', 'lastName')

When you call get on a computed property, the function will be called and the return value will be returned instead of the function itself.

Unknown Properties

Likewise, if you try to call get on a property whose value is undefined, the unknownProperty() method will be called on the object. If this method returns any value other than undefined, it will be returned instead. This allows you to implement "virtual" properties that are not defined upfront.

Parameters:

keyName String
The property to retrieve

Returns:

Object
The property value or undefined.

getEach

(key) Array

Alias for mapBy

Parameters:

key String
name of the property

Returns:

Array
The mapped array.

getProperties

(list) Hash

To get the values of multiple properties at once, call getProperties with a list of strings or an array:

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record.getProperties('firstName', 'lastName', 'zipCode');
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }

is equivalent to:

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record.getProperties(['firstName', 'lastName', 'zipCode']);
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }

Parameters:

list String...|Array
of keys to get

Returns:

Hash

getWithDefault

(keyName, defaultValue) Object

Retrieves the value of a property, or a default value in the case that the property returns undefined.

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person.getWithDefault('lastName', 'Doe');

Parameters:

keyName String
The name of the property to retrieve
defaultValue Object
The value to return if the property value is undefined

Returns:

Object
The property value or the defaultValue.

has

(attribute) Boolean

Checks if there is error messages for the given attribute.

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App.UserEditRoute = Ember.Route.extend({
  actions: {
    save: function(user) {
       if (user.get('errors').has('email')) {
         return alert('Please update your email before attempting to save.');
       }
       user.save();
     }
  }
});

Parameters:

attribute String

Returns:

Boolean
true if there some errors on given attribute

hasObserverFor

(key) Boolean

Returns true if the object currently has observers registered for a particular key. You can use this method to potentially defer performing an expensive action until someone begins observing a particular property on the object.

Parameters:

key String
Key to check

Returns:

Boolean

incrementProperty

(keyName, increment) Number

Set the value of a property to the current value plus some amount.

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person.incrementProperty('age');
team.incrementProperty('score', 2);

Parameters:

keyName String
The name of the property to increment
increment Number
The amount to increment by. Defaults to 1

Returns:

Number
The new property value

init

An overridable method called when objects are instantiated. By default, does nothing unless it is overridden during class definition.

Example:

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App.Person = Ember.Object.extend({
  init: function() {
    alert('Name is ' + this.get('name'));
  }
});

var steve = App.Person.create({
  name: "Steve"
});

// alerts 'Name is Steve'.

NOTE: If you do override init for a framework class like Ember.View or Ember.ArrayController, be sure to call this._super() in your init declaration! If you don't, Ember may not have an opportunity to do important setup work, and you'll see strange behavior in your application.

invoke

(methodName, args) Array

Invokes the named method on every object in the receiver that implements it. This method corresponds to the implementation in Prototype 1.6.

Parameters:

methodName String
the name of the method
args Object...
optional arguments to pass as well.

Returns:

Array
return values from calling invoke.

isAny

(key, value) Boolean

Returns true if the passed property resolves to true for any item in the enumerable. This method is often simpler/faster than using a callback.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean
`true` if the passed function returns `true` for any item

isEvery

(key, value) Boolean

Returns true if the passed property resolves to true for all items in the enumerable. This method is often simpler/faster than using a callback.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean

map

(callback, target) Array

Maps all of the items in the enumeration to another value, returning a new array. This method corresponds to map() defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return the mapped value.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Array
The mapped array.

mapBy

(key) Array

Similar to map, this specialized function returns the value of the named property on all items in the enumeration.

Parameters:

key String
name of the property

Returns:

Array
The mapped array.

mapProperty

(key) Array deprecated

Similar to map, this specialized function returns the value of the named property on all items in the enumeration.

Parameters:

key String
name of the property

Returns:

Array
The mapped array.

metaForProperty

(key)

In some cases, you may want to annotate computed properties with additional metadata about how they function or what values they operate on. For example, computed property functions may close over variables that are then no longer available for introspection.

You can pass a hash of these values to a computed property like this:

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person: function() {
  var personId = this.get('personId');
  return App.Person.create({ id: personId });
}.property().meta({ type: App.Person })

Once you've done this, you can retrieve the values saved to the computed property from your class like this:

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MyClass.metaForProperty('person');

This will return the original hash that was passed to meta().

Parameters:

key String
property name

nextObject

private

notifyPropertyChange

(keyName) Ember.Observable

Convenience method to call propertyWillChange and propertyDidChange in succession.

Parameters:

keyName String
The property key to be notified about.

Returns:

Ember.Observable

off

(name, target, method)

Cancels subscription for given name, target, and method.

Parameters:

name String
The name of the event
target Object
The target of the subscription
method Function
The function of the subscription

Returns:

this

on

(name, target, method)

Subscribes to a named event with given function.

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person.on('didLoad', function() {
  // fired once the person has loaded
});

An optional target can be passed in as the 2nd argument that will be set as the "this" for the callback. This is a good way to give your function access to the object triggering the event. When the target parameter is used the callback becomes the third argument.

Parameters:

name String
The name of the event
target Object
The "this" binding for the callback
method Function
The callback to execute

Returns:

this

one

(name, target, method)

Subscribes a function to a named event and then cancels the subscription after the first time the event is triggered. It is good to use one when you only care about the first time an event has taken place.

This function takes an optional 2nd argument that will become the "this" value for the callback. If this argument is passed then the 3rd argument becomes the function.

Parameters:

name String
The name of the event
target Object
The "this" binding for the callback
method Function
The callback to execute

Returns:

this

propertyDidChange

(keyName) Ember.Observable

Notify the observer system that a property has just changed.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyWillChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that has just changed.

Returns:

Ember.Observable

propertyWillChange

(keyName) Ember.Observable

Notify the observer system that a property is about to change.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyDidChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that is about to change.

Returns:

Ember.Observable

reduce

(callback, initialValue, reducerProperty) Object

This will combine the values of the enumerator into a single value. It is a useful way to collect a summary value from an enumeration. This corresponds to the reduce() method defined in JavaScript 1.8.

The callback method you provide should have the following signature (all parameters are optional):

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function(previousValue, item, index, enumerable);
  • previousValue is the value returned by the last call to the iterator.
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

Return the new cumulative value.

In addition to the callback you can also pass an initialValue. An error will be raised if you do not pass an initial value and the enumerator is empty.

Note that unlike the other methods, this method does not allow you to pass a target object to set as this for the callback. It's part of the spec. Sorry.

Parameters:

callback Function
The callback to execute
initialValue Object
Initial value for the reduce
reducerProperty String
internal use only.

Returns:

Object
The reduced value.

registerHandlers

(target, becameInvalid, becameValid)

Register with target handler

Parameters:

target Object
becameInvalid Function
becameValid Function

reject

(callback, target) Array

Returns an array with all of the items in the enumeration where the passed function returns false for. This method is the inverse of filter().

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration
  • enumerable is the enumerable object itself.

It should return the a falsey value to include the item in the results.

Note that in addition to a callback, you can also pass an optional target object that will be set as "this" on the context. This is a good way to give your iterator function access to the current object.

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Array
A rejected array.

rejectBy

(key, value) Array

Returns an array with the items that do not have truthy values for key. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to false.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Array
rejected array

rejectProperty

(key, value) Array deprecated

Returns an array with the items that do not have truthy values for key. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to false.

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Array
rejected array

remove

(attribute)

Removes all error messages from the given attribute and sends becameValid event to the record if there no more errors left.

Example:

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App.User = DS.Model.extend({
  email: DS.attr('string'),
  twoFactorAuth: DS.attr('boolean'),
  phone: DS.attr('string')
});

App.UserEditRoute = Ember.Route.extend({
  actions: {
    save: function(user) {
       if (!user.get('twoFactorAuth')) {
         user.get('errors').remove('phone');
       }
       user.save();
     }
  }
});

Parameters:

attribute String

removeEnumerableObserver

(target, opts)

Removes a registered enumerable observer.

Parameters:

target Object
opts Hash

Returns:

this

removeObserver

(key, target, method)

Remove an observer you have previously registered on this object. Pass the same key, target, and method you passed to addObserver() and your target will no longer receive notifications.

Parameters:

key String
The key to observer
target Object
The target object to invoke
method String|Function
The method to invoke.

reopen

Augments a constructor's prototype with additional properties and functions:

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MyObject = Ember.Object.extend({
  name: 'an object'
});

o = MyObject.create();
o.get('name'); // 'an object'

MyObject.reopen({
  say: function(msg){
    console.log(msg);
  }
})

o2 = MyObject.create();
o2.say("hello"); // logs "hello"

o.say("goodbye"); // logs "goodbye"

To add functions and properties to the constructor itself, see reopenClass

reopenClass

Augments a constructor's own properties and functions:

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MyObject = Ember.Object.extend({
  name: 'an object'
});

MyObject.reopenClass({
  canBuild: false
});

MyObject.canBuild; // false
o = MyObject.create();

In other words, this creates static properties and functions for the class. These are only available on the class and not on any instance of that class.

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App.Person = Ember.Object.extend({
  name : "",
  sayHello : function(){
    alert("Hello. My name is " + this.get('name'));
  }
});

App.Person.reopenClass({
  species : "Homo sapiens",
  createPerson: function(newPersonsName){
    return App.Person.create({
      name:newPersonsName
    });
  }
});

var tom = App.Person.create({
  name : "Tom Dale"
});
var yehuda = App.Person.createPerson("Yehuda Katz");

tom.sayHello(); // "Hello. My name is Tom Dale"
yehuda.sayHello(); // "Hello. My name is Yehuda Katz"
alert(App.Person.species); // "Homo sapiens"

Note that species and createPerson are not valid on the tom and yehuda variables. They are only valid on App.Person.

To add functions and properties to instances of a constructor by extending the constructor's prototype see reopen

set

(keyName, value) Ember.Observable

Sets the provided key or path to the value.

This method is generally very similar to calling object[key] = value or object.key = value, except that it provides support for computed properties, the setUnknownProperty() method and property observers.

Computed Properties

If you try to set a value on a key that has a computed property handler defined (see the get() method for an example), then set() will call that method, passing both the value and key instead of simply changing the value itself. This is useful for those times when you need to implement a property that is composed of one or more member properties.

Unknown Properties

If you try to set a value on a key that is undefined in the target object, then the setUnknownProperty() handler will be called instead. This gives you an opportunity to implement complex "virtual" properties that are not predefined on the object. If setUnknownProperty() returns undefined, then set() will simply set the value on the object.

Property Observers

In addition to changing the property, set() will also register a property change with the object. Unless you have placed this call inside of a beginPropertyChanges() and endPropertyChanges(), any "local" observers (i.e. observer methods declared on the same object), will be called immediately. Any "remote" observers (i.e. observer methods declared on another object) will be placed in a queue and called at a later time in a coalesced manner.

Chaining

In addition to property changes, set() returns the value of the object itself so you can do chaining like this:

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record.set('firstName', 'Charles').set('lastName', 'Jolley');

Parameters:

keyName String
The property to set
value Object
The value to set or `null`.

Returns:

Ember.Observable

setEach

(key, value) Object

Sets the value on the named property for each member. This is more efficient than using other methods defined on this helper. If the object implements Ember.Observable, the value will be changed to set(), otherwise it will be set directly. null objects are skipped.

Parameters:

key String
The key to set
value Object
The object to set

Returns:

Object
receiver

setProperties

(hash) Ember.Observable

Sets a list of properties at once. These properties are set inside a single beginPropertyChanges and endPropertyChanges batch, so observers will be buffered.

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record.setProperties({ firstName: 'Charles', lastName: 'Jolley' });

Parameters:

hash Hash
the hash of keys and values to set

Returns:

Ember.Observable

some

(callback, target) Boolean deprecated

Returns true if the passed function returns true for any item in the enumeration. This corresponds with the some() method in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

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function(item, index, enumerable);
  • item is the current item in the iteration.
  • index is the current index in the iteration.
  • enumerable is the enumerable object itself.

It should return the true to include the item in the results, false otherwise.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Usage Example:

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if (people.some(isManager)) { Paychecks.addBiggerBonus(); }

Parameters:

callback Function
The callback to execute
target Object
The target object to use

Returns:

Boolean
`true` if the passed function returns `true` for any item

someProperty

(key, value) Boolean deprecated

Parameters:

key String
the property to test
value String
optional value to test against.

Returns:

Boolean
`true` if the passed function returns `true` for any item

sortBy

(property) Array

Converts the enumerable into an array and sorts by the keys specified in the argument.

You may provide multiple arguments to sort by multiple properties.

Parameters:

property String
name(s) to sort on

Returns:

Array
The sorted array.

toArray

Array

Simply converts the enumerable into a genuine array. The order is not guaranteed. Corresponds to the method implemented by Prototype.

Returns:

Array
the enumerable as an array.

toString

String

Returns a string representation which attempts to provide more information than Javascript's toString typically does, in a generic way for all Ember objects.

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App.Person = Em.Object.extend()
person = App.Person.create()
person.toString() //=> "<App.Person:ember1024>"

If the object's class is not defined on an Ember namespace, it will indicate it is a subclass of the registered superclass:

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Student = App.Person.extend()
student = Student.create()
student.toString() //=> "<(subclass of App.Person):ember1025>"

If the method toStringExtension is defined, its return value will be included in the output.

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App.Teacher = App.Person.extend({
  toStringExtension: function() {
    return this.get('fullName');
  }
});
teacher = App.Teacher.create()
teacher.toString(); //=> "<App.Teacher:ember1026:Tom Dale>"

Returns:

String
string representation

toggleProperty

(keyName) Object

Set the value of a boolean property to the opposite of it's current value.

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starship.toggleProperty('warpDriveEngaged');

Parameters:

keyName String
The name of the property to toggle

Returns:

Object
The new property value

trigger

(name, args)

Triggers a named event for the object. Any additional arguments will be passed as parameters to the functions that are subscribed to the event.

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person.on('didEat', function(food) {
  console.log('person ate some ' + food);
});

person.trigger('didEat', 'broccoli');

// outputs: person ate some broccoli

Parameters:

name String
The name of the event
args Object...
Optional arguments to pass on

uniq

Ember.Enumerable

Returns a new enumerable that contains only unique values. The default implementation returns an array regardless of the receiver type.

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var arr = ["a", "a", "b", "b"];
arr.uniq();  // ["a", "b"]

Returns:

Ember.Enumerable

unknownProperty

private

willDestroy

Override to implement teardown.

without

(value) Ember.Enumerable

Returns a new enumerable that excludes the passed value. The default implementation returns an array regardless of the receiver type unless the receiver does not contain the value.

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var arr = ["a", "b", "a", "c"];
arr.without("a");  // ["b", "c"]

Parameters:

value Object

Returns:

Ember.Enumerable
Show:

[]

Array

This property will trigger anytime the enumerable's content changes. You can observe this property to be notified of changes to the enumerables content.

For plain enumerables, this property is read only. Array overrides this method.

Returns:

this

concatenatedProperties

Array

Defines the properties that will be concatenated from the superclass (instead of overridden).

By default, when you extend an Ember class a property defined in the subclass overrides a property with the same name that is defined in the superclass. However, there are some cases where it is preferable to build up a property's value by combining the superclass' property value with the subclass' value. An example of this in use within Ember is the classNames property of Ember.View.

Here is some sample code showing the difference between a concatenated property and a normal one:

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App.BarView = Ember.View.extend({
  someNonConcatenatedProperty: ['bar'],
  classNames: ['bar']
});

App.FooBarView = App.BarView.extend({
  someNonConcatenatedProperty: ['foo'],
  classNames: ['foo']
});

var fooBarView = App.FooBarView.create();
fooBarView.get('someNonConcatenatedProperty'); // ['foo']
fooBarView.get('classNames'); // ['ember-view', 'bar', 'foo']

This behavior extends to object creation as well. Continuing the above example:

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var view = App.FooBarView.create({
  someNonConcatenatedProperty: ['baz'],
  classNames: ['baz']
})
view.get('someNonConcatenatedProperty'); // ['baz']
view.get('classNames'); // ['ember-view', 'bar', 'foo', 'baz']

Adding a single property that is not an array will just add it in the array:

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var view = App.FooBarView.create({
  classNames: 'baz'
})
view.get('classNames'); // ['ember-view', 'bar', 'foo', 'baz']

Using the concatenatedProperties property, we can tell to Ember that mix the content of the properties.

In Ember.View the classNameBindings and attributeBindings properties are also concatenated, in addition to classNames.

This feature is available for you to use throughout the Ember object model, although typical app developers are likely to use it infrequently. Since it changes expectations about behavior of properties, you should properly document its usage in each individual concatenated property (to not mislead your users to think they can override the property in a subclass).

Default: null

content

{Array} private

errorsByAttributeName

{Ember.MapWithDefault} private

firstObject

Object

Helper method returns the first object from a collection. This is usually used by bindings and other parts of the framework to extract a single object if the enumerable contains only one item.

If you override this method, you should implement it so that it will always return the same value each time it is called. If your enumerable contains only one object, this method should always return that object. If your enumerable is empty, this method should return undefined.

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var arr = ["a", "b", "c"];
arr.get('firstObject');  // "a"

var arr = [];
arr.get('firstObject');  // undefined

Returns:

Object
the object or undefined

hasEnumerableObservers

Boolean

Becomes true whenever the array currently has observers watching changes on the array.

isDestroyed

Destroyed object property flag.

if this property is true the observers and bindings were already removed by the effect of calling the destroy() method.

Default: false

isDestroying

Destruction scheduled flag. The destroy() method has been called.

The object stays intact until the end of the run loop at which point the isDestroyed flag is set.

Default: false

isEmpty

{Boolean}

lastObject

Object

Helper method returns the last object from a collection. If your enumerable contains only one object, this method should always return that object. If your enumerable is empty, this method should return undefined.

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var arr = ["a", "b", "c"];
arr.get('lastObject');  // "c"

var arr = [];
arr.get('lastObject');  // undefined

Returns:

Object
the last object or undefined

length

{Number}

Total number of errors.

messages

{Array}

An array containing all of the error messages for this record. This is useful for displaying all errors to the user.

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{{#each errors.messages}}
  <div class="error">
    {{message}}
  </div>
{{/each}}