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Ember Data cannot read async property from undefined

Using Ember v1.8 beta 3+ with Ember Data 1.0 beta 10 - you will get this error:

Error while processing route: index Cannot read property 'async' of undefined TypeError: Cannot read property 'async' of undefined at Relationship [as _super$constructor] (http://builds.emberjs.com/canary/ember-data.js:9523:46) at new BelongsToRelationship (http://builds.emberjs.com/canary/ember-data.js:9736:12) at createRelationshipFor (http://builds.emberjs.com/canary/ember-data.js:9840:16) at http://builds.emberjs.com/canary/ember-data.js:6366:41 at http://builds.emberjs.com/canary/ember-data.js:9307:20 at cb (http://builds.emberjs.com/ember-latest.js:15907:13) at OrderedSet.forEach (http://builds.emberjs.com/ember-latest.js:15703:13) at Map.forEach (http://builds.emberjs.com/ember-latest.js:15911:19) at Function.Model.reopenClass.eachRelationship (http://builds.emberjs.com/canary/ember-data.js:9306:42) at Ember.Object.extend._setup (http://builds.emberjs.com/canary/ember-data.js:6365:26)

Despite the fact that your models are configured correctly:

 App.Color = DS.Model.extend({ color: DS.attr(), foo: DS.belongsTo('foo', {async:true}) }); App.Foo = DS.Model.extend({ foo: DS.attr() });

Example: http://emberjs.jsbin.com/OxIDiVU/1111/edit

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1 answer

This is a bug with Ember / Ember-data versions. Ember changed its map implementation to Ember 1.8 beta 3, breaking any version of Ember Data less than 1.0 beta 10.

Here's the github issue: https://github.com/emberjs/data/issues/2323

Fixed in 1.0.0-beta.11 + canary.2997e47034 or higher.

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Source: https://habr.com/ru/post/1203563/

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