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POWhy is Paperclip giving me this "unknown attribute" error?
 

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  1. POWhy is Paperclip giving me this "unknown attribute" error?
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    <p>I have...</p> <p><strong>/config/routes.rb</strong>:</p> <pre><code>resources :surveys do resources :screenshots end </code></pre> <p><strong>/app/models/survey.rb</strong>:</p> <pre><code>has_many :screenshots </code></pre> <p><strong>/app/models/screenshot.rb</strong>:</p> <pre><code>attr_accessible :name, :shot, :screenshot, :result_ids belongs_to :survey has_many :results has_attached_file :shot, :default_url =&gt; ActionController::Base.helpers.asset_path('missing_:style.png') </code></pre> <p><strong>/db/schema.rb</strong>:</p> <pre><code>create_table "screenshots", :force =&gt; true do |t| t.integer "survey_id" t.boolean "resetting_cache", :default =&gt; false t.string "url" t.string "shot_file_name" t.string "shot_content_type" t.integer "shot_file_size" t.datetime "shot_updated_at" t.boolean "include", :default =&gt; false t.datetime "created_at", :null =&gt; false t.datetime "updated_at", :null =&gt; false t.string "name" end </code></pre> <p><strong>/app/controllers/screenshots_controller.rb</strong>:</p> <pre><code>def new @survey = Survey.find(params[:survey_id]) @competitor = @survey.competitor @screenshot = Screenshot.new end def create @survey = Survey.find(params[:survey_id]) @screenshot = Screenshot.new(params[:screenshot]) @competitor = @survey.competitor flash[:notice] = "Screenshot was successfully added." if @screenshot.save respond_with(@survey, @screenshot) end </code></pre> <p><strong>/app/views/screenshots/_form.html.haml</strong>:</p> <pre><code>= simple_form_for [@survey, @screenshot] do |f| = f.error_notification = f.file_field :shot = f.association :results, :collection =&gt; @survey.selected_results = f.button :submit, :label =&gt; "Save", :id =&gt; "submit_screenshot" </code></pre> <p>Does anyone know why <code>@screenshot = Screenshot.new(params[:screenshot])</code> is giving me an <code>unknown attribute: screenshot</code> error?</p> <p>Typical <code>params</code> at that point would be:</p> <pre><code>=&gt; {"utf8"=&gt;"✓", "authenticity_token"=&gt;"t33SO+/mpPlQY/+7+5iRTe6O2zL/MtqisYXyghzkLY8=", "screenshot"=&gt; {"screenshot"=&gt; #&lt;ActionDispatch::Http::UploadedFile:0x007fd5cca0ace0 @content_type="image/png", @headers= "Content-Disposition: form-data; name=\"screenshot[screenshot]\"; filename=\"youtube.png\"\r\nContent-Type: image/png\r\n", @original_filename="youtube.png", @tempfile= #&lt;File:/var/folders/k9/vnpft_6d7qs6xmdb9_4svvmw0000gn/T/RackMultipart20131125-3030-1gmx1sy&gt;&gt;, "result_ids"=&gt;["", "29857"]}, "commit"=&gt;"Create Screenshot", "action"=&gt;"create", "controller"=&gt;"screenshots", "survey_id"=&gt;"14564"} </code></pre>
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