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POForms for file upload in nested model in rails
 

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  1. POForms for file upload in nested model in rails
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    <p>I'm aiming to implement a one-to-many -> one-to-many structure like the one described in the <a href="http://guides.rubyonrails.org/association_basics.html" rel="nofollow noreferrer">rails api here</a>:</p> <pre><code>class Document &lt; ActiveRecord::Base has_many :sections has_many :paragraphs, :through =&gt; :sections end class Section &lt; ActiveRecord::Base belongs_to :document has_many :paragraphs end class Paragraph &lt; ActiveRecord::Base belongs_to :section end </code></pre> <p>I'm trying to let the paragraphs class have a file upload through carrierwave, as described in <a href="http://railscasts.com/episodes/253-carrierwave-file-uploads" rel="nofollow noreferrer">the railscast</a> on the topic, <a href="http://railscasts.com/episodes/196-nested-model-form-revised" rel="nofollow noreferrer">within a nested AJAX form that lets me add and remove sections and paragraphs</a>.</p> <p>Since I will be viewing the pictures only within the full document, I'm trying to keep the code within my Document controller. So, right now, the controller there is:</p> <pre><code> def show @document = Document.find_by_username(params[:documentname]) @section = @document.sections # @paragraph = @section.paragraphs #DONT UNDERSTAND WHY UNCOMMENTING THIS DOESNT WORK. end </code></pre> <p>Both my document and section models have the <code>accepts_nested_attributes_for</code> set up. However, when I load a document view, if I uncomment the <code>@paragraph</code> above, I get an error that suggests section assignment was successful, but paragraph assignment was unsuccessful for lack of a method:</p> <pre><code>NoMethodError in DocumentController#show undefined method `paragraph' for #&lt;ActiveRecord::Relation:0x007f9b6409c340&gt; </code></pre> <p>If I comment it out, it appears to load the section assignment fine. Currently, my sections and paragraph tables are completely blank because I can't set up the forms, so maybe that is part of the problem. But I think nil would give me a different error than no method, right? So, I suspect something is wrong under the hood already.</p> <p><em>So, my main bits of confusion here: How and where do I construct a form controlled by my document controller to accept any data, and then especially to work with the carrierwave file upload?</em></p> <p>If you have any other suggestions on how to structure this better, I'd appreciate it.</p> <p>Also, what would be a good way to go about debugging this? I seem to be missing a method, which one, where?</p> <p>I've referenced these, but wasn't able to find a solution:</p> <ul> <li><a href="http://railscasts.com/episodes/196-nested-model-form-revised" rel="nofollow noreferrer">http://railscasts.com/episodes/196-nested-model-form-revised</a></li> <li><a href="http://railscasts.com/episodes/253-carrierwave-file-uploads" rel="nofollow noreferrer">http://railscasts.com/episodes/253-carrierwave-file-uploads</a></li> <li><a href="https://stackoverflow.com/questions/5009550/carrierwave-upload-with-nested-forms">Carrierwave upload with nested forms?</a></li> <li><a href="https://stackoverflow.com/questions/9357607/rails-3-jquery-file-upload-nested-model">Rails 3 + JQuery-File-Upload + Nested Model</a></li> <li><a href="https://stackoverflow.com/questions/5533879/rails-3-and-a-nested-jquery-file-upload-model">Rails 3 and a Nested jQuery File Upload Model</a></li> </ul> <h1>Update 1</h1> <p>I suspect the problem is coming from my bad show commands? It can't multi-index the right sections to the right paragraphs? So,</p> <pre><code> def show @document = Document.find_by_username(params[:documentname]) @section = @document.sections # @paragraph = @section.paragraphs #DONT UNDERSTAND WHY UNCOMMENTING THIS DOESNT WORK. end </code></pre> <p>should be more like:</p> <pre><code> def show @document = Document.find_by_username(params[:documentname]) @section = @document.sections @paragraph = @section.find(params[:section_id]).paragraphs end </code></pre> <p>This doesn't work, but something like that? There's a way it doesn't seem to be linking the sections to the individual paragraphs. The error I get with the above is:</p> <pre><code>ActiveRecord::RecordNotFound in DocumentController#show Couldn't find Section without an ID </code></pre> <h1>Update 2</h1> <p>Maybe that means I should telescope all of the show commands? ie, that getting the right paragraphs for the right section would be covered more like so:</p> <p>in the document controller:</p> <pre><code>def show @document = Document.find_by_username(params[:documentname]) @section = @document.sections end </code></pre> <p>in the section controller:</p> <pre><code>def show @section = Section.find(params[:id]) @paragraph = @section.pictures end </code></pre> <p><em>So, if that is the case, how do I set up my nested form? To jointly create (1) sections, (2) paragraphs, and (3) images in the railcasts-style ajax interface from within document#show page?</em></p>
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