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PORails 3 polymorphic dissociation "NoMethodError: undefined method `name' for nil:NilClass: INSERT INTO"
 

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  1. PORails 3 polymorphic dissociation "NoMethodError: undefined method `name' for nil:NilClass: INSERT INTO"
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    <p>I've two models with a polymorphic association (hopefully set up well). When I try to upload a file I run in an error witch tells me something like: <code>NoMethodError: undefined method `name' for nil:NilClass: INSERT INTO "uploads"</code> I have absolut no glue where the name attribute comes from and why the model saves if I left the file attribute empty. </p> <pre><code>class Event &lt; ActiveRecord::Base attr_accessible :title, :uploads_attributes has_many :uploads, :as =&gt; :uploadable accepts_nested_attributes_for :uploads end class Upload &lt; ActiveRecord::Base attr_accessible :filename, :path, :title belongs_to :uploadable, :polymorphic =&gt; true end </code></pre> <p>Here the form views for adding new events with uploads</p> <pre><code>&lt;%= form_for(@event) do |f| %&gt; &lt;div class="field"&gt; &lt;%= f.text_area :title, :rows =&gt; 4 %&gt; &lt;/div&gt; &lt;div&gt; &lt;%= f.fields_for :uploads do |builder| %&gt; &lt;div&gt;&lt;%= builder.text_field :title %&gt;&lt;/div&gt; &lt;div&gt;&lt;%= builder.file_field :filename %&gt;&lt;/div&gt; &lt;% end %&gt; &lt;/div&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>The controller is straight forward like shown in Railscast episodes #196 and #197</p> <pre><code>def new @event = Event.new @event.uploads.build respond_to do |format| format.html # new.html.erb format.json { render json: @event } end end </code></pre> <p><strong>update:</strong> The create action is plain vanilla scaffolding code...</p> <pre><code>def create @event = Event.new(params[:event]) respond_to do |format| if @event.save format.html { redirect_to @event, notice: 'Event was successfully created.' } format.json { render json: @event, status: :created, location: @event } else format.html { render action: "new" } format.json { render json: @event.errors, status: :unprocessable_entity } end end end </code></pre> <p>If I just insert a title to the Upload form all things running well. But if I select a file as well I run in this error on saving.</p> <pre><code>NoMethodError: undefined method `name' for nil:NilClass: INSERT INTO "uploads" ("created_at", "filename", "path", "title", "updated_at", "uploadable_id", "uploadable_type") VALUES (?, ?, ?, ?, ?, ?, ?) </code></pre> <p>The parameters looking fine for me ...</p> <pre><code>{"utf8"=&gt;"✓", "authenticity_token"=&gt;"ppPQnkqXPSbNzRU4KGW11EpzktONZC2DS+hkRQAOnlM=", "event"=&gt;{"title"=&gt;"Erstes", "uploads_attributes"=&gt;{"0"=&gt;{"title"=&gt;"foo", "filename"=&gt;#&lt;ActionDispatch::Http::UploadedFile:0x00000003a2d548 @original_filename="Hazard_E.svg", @content_type="image/svg+xml", @headers="Content-Disposition: form-data; name=\"event[uploads_attributes][0][filename]\"; filename=\"Hazard_E.svg\"\r\nContent-Type: image/svg+xml\r\n", @tempfile=#&lt;File:/tmp/RackMultipart20120721-25352-1ioiss9&gt;&gt;}}}, "commit"=&gt;"Create Event"} </code></pre> <p>This is a Rails 3.2.6 app. I've create a new one with the same error as in my development project.</p>
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    1. USzzeroo
    1. USzzeroo
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    1. COCould you place here `create` action?
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    2. COQuestion updated, create action is shown at the controller part of her.
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      1. USzzeroo
    3. COJust a while shot in the dark: What if you changed it to `<div><%= builder.file_field :uploadable %></div>` This might be a similar issue to http://stackoverflow.com/questions/7055074/adding-multipart-true-throws-undefined-method-name-error
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      1. USBenjamin Tan Wei Hao
 

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