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POSide-loading objects with non-standard class names in EmberJS with Rails+active_model_serializers
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2013-03-12T14:01:08.390
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2013-03-12T15:15:49.427
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Body
I have a few models in Rails that look something like this: <pre><code>class Issue < ActiveRecord::Base belongs_to :reporter, class_name: 'User' belongs_to :assignee, class_name: 'User' has_many :comments end class User < ActiveRecord::Base end class Comment < ActiveRecord::Base end </code></pre> with serializers like so: <pre><code>class IssueSerializer < ActiveModel::Serializer attributes :id embed :ids, include: true has_one :reporter, :embed => :ids has_one :assignee, :embed => :ids end class UserSerializer < ActiveModel::Serializer attributes :id, :name end class CommentSerializer < ActiveModel::Serializer attributes :id, :body end </code></pre> This produces JSON that looks something like the following: <pre><code>{ "issues": [ { "id": 6, "reporter_id": 1, "assignee_id": 2, "comment_ids": [ 3 ] }, ], "comments": [ { "id": 3 "body": "Great comment" } ], "reporters": [ { "id": 1 "name": "Ben Burton" } ], "assignees": [ { "id": 2 "name": "Jono Mallanyk" } ] } </code></pre> The problem is that the side-loaded reporters and assignees JSON objects aren't recognized by Ember as User objects, and I see the following error: <pre><code>Uncaught Error: assertion failed: Your server returned a hash with the key reporters but you have no mapping for it </code></pre> I don't want to remove <pre><code>embed :ids, include: true </code></pre> from my IssueSerializer, because then the comments wouldn't be serialized. There are a few potential ways to solve this that I've considered: <ul> <li>If the embed method for ActiveModel::Serializer accepted a list of models in its include option, this could filter the JSON response to only include side-loaded comments.</li> <li>Ember data's model could be configured to side load users from "users", "reporters" and "assignees"... but as far as I can tell from the source it only appears to support one key for sideloadAs.</li> <li>Somehow ignore/disable side-loading errors for unknown keys (probably the least sane approach).</li> </ul> Is there another option I'm missing here? I think I may have to write a fix and submit a pull request to either rails-api/active_model_serializers, emberjs/data, or both. EDIT: My temporary workaround for this is to change the IssueSerializer to only serialize the ids for reporter and assignee: <pre><code>class IssueSerializer < ActiveModel::Serializer attributes :id, :reporter_id, :assignee_id embed :ids, include: true has_many :comments, :embed => :ids end </code></pre>
Tags
<ember.js><ember-data><active-model-serializers>
Title
Side-loading objects with non-standard class names in EmberJS with Rails+active_model_serializers
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