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    copied!<p>I've done a nested has_many :through and you have to basically pass the attributes to the :companies_users model and then to the :users model </p> <hr> <h1>My Code (Rails 4.0)</h1> <p><strong>Form</strong></p> <pre><code>#views/admin/posts/new &lt;%= form_for [:admin, resource], :html =&gt; { :multipart =&gt; true } do |f| %&gt; &lt;table class="resource_table"&gt; &lt;thead&gt; &lt;th colspan="2"&gt;&lt;%= params[:action].capitalize %&gt; &lt;%= resource_class %&gt;&lt;/th&gt; &lt;/thead&gt; &lt;tbody class="form"&gt; &lt;% attributes.each do |attr| %&gt; &lt;tr class="&lt;%= cycle('odd', '')%&gt;"&gt; &lt;td&gt;&lt;%= resource_class.human_attribute_name(attr) %&gt;&lt;/td&gt; &lt;td&gt; &lt;% if attr == "body" %&gt; &lt;%= f.text_area attr, :rows =&gt; 60, :cols =&gt; 80, :class =&gt; "redactor" %&gt; &lt;% else %&gt; &lt;%= f.text_field attr, :value =&gt; resource.public_send(attr).to_s %&gt; &lt;% end %&gt; &lt;/td&gt; &lt;/tr&gt; &lt;% end %&gt; &lt;%= f.fields_for :images_posts do |images_posts| %&gt; &lt;%= images_posts.fields_for :image do |images| %&gt; &lt;tr&gt; &lt;td&gt;Image&lt;/td&gt; &lt;td&gt;&lt;%= images.file_field :image %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;% end %&gt; &lt;tr&gt; &lt;td&gt;Caption&lt;/td&gt; &lt;td&gt;&lt;%= images_posts.text_field :caption %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;% end %&gt; &lt;tr class="dull"&gt; &lt;td colspan="2"&gt;&lt;%= f.submit "Go" %&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; &lt;% end %&gt; </code></pre> <p><strong>Models</strong></p> <pre><code>#models/image_post.rb (the join model) class ImagePost &lt; ActiveRecord::Base #Associations belongs_to :post, :class_name =&gt; 'Post' belongs_to :image, :class_name =&gt; 'Image' #Validations validates_uniqueness_of :post_id, :scope =&gt; :image_id #Nested Association (Can upload &amp; add images from form) accepts_nested_attributes_for :image, :allow_destroy =&gt; true end #models/image.rb class Image &lt; ActiveRecord::Base #Associations has_many :products, :class_name =&gt; 'Product', :through =&gt; :images_products, dependent: :destroy has_many :images_products, :class_name =&gt; 'ImageProduct' has_many :posts, :class_name =&gt; 'Post', :through =&gt; :images_posts, dependent: :destroy has_many :images_posts, :class_name =&gt; 'ImagePost' has_many :brands, :class_name =&gt; 'Brand', :through =&gt; :brands_images, dependent: :destroy has_many :brands_images, :class_name =&gt; 'BrandImages' #Image Upload Paperclip.options[:command_path] = 'C:\RailsInstaller\ImageMagick' has_attached_file :image, :styles =&gt; { :medium =&gt; "x300", :thumb =&gt; "x100" }, :default_url =&gt; "", :storage =&gt; :s3, :bucket =&gt; '' :s3_credentials =&gt; S3_CREDENTIALS #Validations validates_presence_of :image, :message =&gt; "No Image Present!" end #models/post.rb class Post &lt; ActiveRecord::Base #Images has_many :images, -&gt; { uniq }, :class_name =&gt; 'Image', :through =&gt; :images_posts, dependent: :destroy has_many :images_posts, :class_name =&gt; 'ImagePost' #Nested Association (Can upload &amp; add images from form) accepts_nested_attributes_for :images_posts, :allow_destroy =&gt; true end </code></pre> <p>This was a BIG help for me: <strong><a href="https://stackoverflow.com/questions/2182428/rails-nested-form-with-has-many-through-how-to-edit-attributes-of-join-model">Rails nested form with has_many :through, how to edit attributes of join model?</a></strong></p> <hr> <p><strong>Diagnosing Your Issue</strong></p> <p>I posted my code to give you a working example of what you can do (mine still needs refinement, but it works)</p> <p>Looking at your code, you should add "accepts_nested_attributes_for" into your companies_users.rb model like this:</p> <pre><code>accepts_nested_attributes_for :user </code></pre> <p>In your companies model, change your accepts_nested_attributes_for to:</p> <pre><code>accepts_nested_attributes_for :companies_users </code></pre>
 

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