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POCannot serialize an object of class ActionDispatch::Http::UploadedFile into BSON
 

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    <p>I'm following <a href="http://socialmemorycomplex.net/2010/06/02/gridfs-with-mongoid-and-carrierwave-on-rails-3/" rel="nofollow">GridFS with Mongoid and CarrierWave</a> to implement a simple has_many polymorphic relationship and when I attempt to create a new user, with an avatar, through nested attribute assignment, I get:</p> <pre class="lang-rb prettyprint-override"><code>Cannot serialize an object of class ActionDispatch::Http::UploadedFile into BSON </code></pre> <p>Has anyone else encountered this? I noticed a few individuals posted replies to the "GridFS with Mongoid and CarrierWave" article but I was unable to find anyone with an answer.</p> <pre class="lang-rb prettyprint-override"><code># app/models/asset.rb class Asset include Mongoid::Document include Mongoid::Timestamps mount_uploader :file, AssetUploader field :name, type: String referenced_in :attachable, polymorphic: true end </code></pre> <pre class="lang-rb prettyprint-override"><code># app/models/user.rb class User include Mongoid::Document include Mongoid::Timestamps references_one :avatar, as: :attachable accepts_nested_attributes :avatar end </code></pre> <pre class="lang-rb prettyprint-override"><code># config/initializers/carrierwave.rb CarrierWave.configure do |config| config.grid_fs_connection = Mongoid.database config.storage = :grid_fs config.grid_fs_access_url = "/images" end </code></pre> <pre class="lang-rb prettyprint-override"><code># app/uploaders/asset_uploader.rb class AssetUploader &lt; CarrierWave::Uploader::Base end </code></pre> <pre class="lang-rb prettyprint-override"><code># app/views/users/new.html.haml = semantic_form_for(@user, html: { multipart: true }) do |f| = f.inputs do = f.semantic_fields_for :avatar do |af| = af.input :file, as: :file = f.buttons do = f.commit_button "Upload" </code></pre>
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    1. COIf you run into this, make sure you've named your form fields correctly. The above code works just fine, assuming there are no mismatched input field names and association names.
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