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PORails : JSON serialization circular reference error with Mongoid:Geospatial objects
 

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  1. PORails : JSON serialization circular reference error with Mongoid:Geospatial objects
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    <p>I have an array of Mongo objects returned by a geolocation query such as :</p> <pre><code>@data = Record.geo_near([lng,lat], :max_distance =&gt; dist, :unit =&gt; :m, :spherical =&gt; true) </code></pre> <p>I'm then trying to serialize the response based on the expected format :</p> <pre><code>respond_to do |format| format.html format.json { render json: @data, :status =&gt; 200 } # Not working format.xml { render xml: @data, :status =&gt; 200 } # Working ! end </code></pre> <p>The weird thing is that everything go smoothly with XML, but I get this error with JSON :</p> <pre><code>ActiveSupport::JSON::Encoding::CircularReferenceError in BouncesController#populars object references itself </code></pre> <p>I found <a href="https://stackoverflow.com/questions/867491/geokit-rails-plugin-cant-call-to-json-on-returned-geoloc-object-gives-circul">this post</a> relating to the same kind of error, but the validated answer did not work for me.</p> <p>Any ideas?</p> <p><strong>EDIT</strong></p> <p>Here is my model for which the issue is happening :</p> <pre><code>class MyModel include Mongoid::Document include Mongoid::Timestamps include Mongoid::Spacial::Document spacial_index :loc, :min =&gt; -180, :max =&gt; 180 belongs_to :user field :text, :type =&gt; String field :loc, :type =&gt; Array, spacial: true field :accuracy, :type =&gt; Float def as_json(options={}) { "id" =&gt; self.id, "text" =&gt; self.text, "loc" =&gt; self.loc, "accuracy" =&gt; self.accuracy, "user" =&gt; { "id" =&gt; self.user['_id'], "login" =&gt; self.user['login'], "role" =&gt; self.user['role'] }, "created_at" =&gt; self.created_at, "updated_at" =&gt; self.updated_at } end end </code></pre>
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    1. COI do have a temporary fix which is pretty nasty but works for the time being : `format.json { render json: Hash.from_xml(@data.to_xml).to_json, :status => 200 }`
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    2. COCan you post an example of `@data` which causes the circular reference error in JSON?
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    3. COI updated my question to provide the model. Anyway it could be linked to a compatibility issue with mongoid as I downgraded to **gem 'mongo', '1.4.0' | gem "mongoid", "~> 2.4"| gem "bson_ext", "~> 1.5"** and everything is working without hacks for now.
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