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PORails carrierwave - can't mass-assign protected attributes error
 

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  1. PORails carrierwave - can't mass-assign protected attributes error
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    <p>I'm trying to build a sample application where users can upload two different types of images to a model named Article. One type of images are images used in the content of the article, and the other is used as a thumbnail. Both types of images are handled by separate polymorphic models named ArticleImage and ArticleThumb.</p> <p>The problem is, whenever I try to upload a thumbnail, it gives me the "<strong>can't mass-protect protected attributes: :article_thumb</strong>" error. This error <em>does not</em> occur for the other type of image uploads.</p> <p><strong>Article</strong></p> <pre><code>class Article &lt; ActiveRecord::Base attr_accessible :title, :article_images_attributes, :article_thumbs_attributes has_many :comments, as: :commentable has_many :article_images, as: :attachable, dependent: :destroy has_many :article_thumbs, as: :attachable, dependent: :destroy accepts_nested_attributes_for :article_images, reject_if: :all_blank, allow_destroy: true accepts_nested_attributes_for :article_thumbs, allow_destroy: true belongs_to :user validates :title, presence: true, length: {maximum: 60} validates :user_id, presence: true validates :article_images, presence: true end </code></pre> <p><strong>ArticleImage</strong></p> <pre><code>class ArticleImage &lt; ActiveRecord::Base belongs_to :attachable, polymorphic: true attr_accessible :article_image mount_uploader :article_image, ArticleImageUploader end </code></pre> <p><strong>ArticleThumb</strong></p> <pre><code>class ArticleThumb &lt; ActiveRecord::Base belongs_to :attachable, polymorphic: true attr_accessible :article_thumb mount_uploader :article_thumb, ArticleThumbUploader end </code></pre> <p><strong>new.html.erb</strong></p> <pre><code>&lt;%= simple_nested_form_for @article, html: {multipart: true}, defaults: {required: false} do |f| %&gt; &lt;%= render 'shared/error_messages', object: @article %&gt; &lt;%= f.input :title %&gt; &lt;div class = "control-label"&gt; Image file upload &lt;/div&gt; &lt;%= f.simple_fields_for :article_images do |p| %&gt; &lt;%= p.file_field :article_image %&gt; &lt;%= p.link_to_remove 'Remove' %&gt; &lt;% end %&gt; &lt;%= f.link_to_add 'Add image', :article_images %&gt; &lt;span class="hint_end"&gt;Acceptable file formats: JPG, JPEG, GIF, PNG&lt;/span&gt; &lt;div class = "control-label"&gt; Thumbnail upload &lt;/div&gt; &lt;%= f.file_field :article_thumb %&gt; &lt;span class="hint"&gt; Automatically resized to 90x90 px. &lt;/span&gt; &lt;span class="hint"&gt; Default thumbnail is used if no thumbnail gets uploaded. &lt;/span&gt; &lt;span class="hint_end"&gt; Acceptable file formats: JPG, JPEG, GIF, PNG &lt;/span&gt; &lt;%= f.submit "Upload article" %&gt; &lt;% end %&gt; </code></pre> <p>I have a feeling this error only requires a very simple fix, but I just can't seem to figure it out. Any help would be appreciated.</p> <p>As a side note, I was wondering if it'd be efficient to mount all the different uploaders in a single polymorphic model so you don't have to create a different model every time you want to upload a different type of image/file. If you don't have much time you certainly don't need to bother answering this but any words on the matter are welcome!</p>
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