StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POHow to observe embedded arrays in Ember objects?
primarykey
Id
10699181
data
AcceptedAnswerId
10699488
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-05-22T09:20:59.267
FavoriteCount
1
LastActivityDate
2012-05-22T19:52:21.737
LastEditDate
2012-05-22T09:37:48.997
LastEditorUserId
65542
OwnerUserId
987185
ParentId
0
PostTypeId
1
Score
1
ViewCount
2280
LastEditorDisplayName
text
Body
In Ember.js, creating a observer which reacts to changes in sub-properties which is an array leads to non intuitive behavior. If the observer directly observes the array property, it fails to fire while if it observes a binding to the same property, it works as expected. A simple example: Handlebars: <pre class="lang-html prettyprint-override"><code><script type="text/x-handlebars"> App.View1.name: {{App.View1.name}} App.View2.name: {{App.View2.name}} </script> </code></pre> Javascript: <pre class="lang-js prettyprint-override"><code>App = Em.Application.create(); // A common dependency for two views var dependency = Em.Object.create({ prop: [] }); // Directly observes dependency.prop App.View1 = Em.View.create({ dependency: dependency, name: "Foo", changeName: function () { this.set("name", "Bar"); }.observes("dependency.prop") }); // Indirectly observes dependency.prop via a binding App.View2 = Em.View.create({ dependency: dependency, name: "Foo", changeName: function () { this.set("name", "Bar"); }.observes("prop"), propBinding: "dependency.prop" }); // Updating the 'prop' property of dependency with an element. dependency.get("prop").pushObject("An object."); </code></pre> I have put it up on JSFiddle here: <a href="http://jsfiddle.net/kbaXG/50/" rel="nofollow">http://jsfiddle.net/kbaXG/50/</a> Here, <code>App.View1.name</code> is NOT updated (stays "Foo") while <code>App.View2.name</code> is updated (to "Bar"). Is this expected behavior and is creating a binding an acceptable workaround?
Tags
<ember.js>
Title
How to observe embedded arrays in Ember objects?
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USpangratz
UserOwnerUserId
1. USmusically_ut
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POHow to observe embedded arrays in Ember objects?
 UserUserId
 USAlexandros K
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.