ruby - Rails update before save the model -

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following section of controller methods:

class productattachmentscontroller < applicationcontroller  def create     @product_attachment = productattachment.new(product_attachment_params)     session[:product_id] --> return product_id     respond_to |format|       if @product_attachment.save          format.html { redirect_to @product_attachment, notice: 'product attachment created.' }         # format.json { render :show, status: :created, location: @product_attachment }         format.json {render :json => @product_attachment}       else         format.html { render :new }         format.json { render json: @product_attachment.errors, status: :unprocessable_entity }       end     end   end  end

model relationships:

class product < activerecord::base has_many :product_attachments, dependent: :destroy  end  class productattachment < activerecord::base      mount_uploader :attachment, attachmentuploader     belongs_to :product end

once user upload picture, product_attachments insert new row in table, how can include product_id along attachment?

enter image description here

thanks!!

edit

view form:

<section class="photos-section <%= 'hide' unless @show_section == 'photo' %>">     <%= form_for(@product) |f| %>         <div class="row">             <div class="col-xs-12 col-sm-12 col-lg-12">                 <hr>                 <div class="form-group">                     <div class="fileupload btn btn-large btn-upload">                         <span><i class="fa fa-upload" aria-hidden="true" id="file_upload"></i> add photos</span>                         <input name="file_attachment" type="file" id="file_upload" class="upload">                      </div>                 </div>                 <hr>              </div>         </div>         <div class="row attachments-container">         <div class="row">   <div class="col-4 row-space-2 h5 invisible" id="js-first-photo-text">     first photo appears in search results!   </div> </div>             <% if !@product.new_record? %>                 <% @product.product_attachments.each |attachment| %>                     <div class="col-xs-6 col-md-4 form-group grayscale">                         <img src="<%= attachment.attachment.small.url %>" class="upload-photo-image">                         <input type="hidden" name="product_attachment[id][]" value="<%= attachment.id %>">                         <button class="delete-photo-btn overlay-btn js-delete-photo-btn delete-attachment" data-toggle="tooltip" data-placement="top" title="delete" data-photo-id="143275119">                             <i class="fa fa-trash-o"></i>                          </button>                          <button class="cover-photo-btn cover-overlay-btn js-delete-photo-btn cover-attachment" data-toggle="tooltip" data-placement="top" title="set cover photo" data-photo-id="143275119">                             <i class="fa fa-picture-o"></i>                          </button>                     </div>                 <% end %>             <% end %>              <div class="col-xs-6 col-md-4 form-group">                 <div class="thumbnail panel photo-item empty-photo-frame" name="empty-photo-frame">                     <img src="<%= asset_url('add-image-placeholder.png') %>">                 </div>             </div>          </div>         <hr>         <div class="row">             <div class="col-xs-12 next-bottom paddingzero">                 <div class="col-xs-6">                     <% if @product.new_record? %>                         <a href="#" class="btn-back">back</a>                     <% else %>                         <a href="/products/<%= @product.id %>/edit_location" class="btn-back">back</a>                     <% end %>                 </div>                 <div class="col-xs-6">                     <% if @product.new_record? %>                         <a href="" class="btn btn-next pull-right">see next</a>                         <a href="/products/<%= @product.id %>/edit_price" class="btn btn-next pull-right">see next</a>                     <% else %>                         <input type="hidden" name="step-param" value="photo">                         <%= f.submit 'see next', :class => 'btn btn-next pull-right photo-submit' %>                     <% end %>                 </div>             </div>         </div>     <% end %> </section>

you can check product_attachment_params think not have product_id field in parameter, because not see product_id field in form. can using 

@product.product_attachments.build(product_attachment_params)

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