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PONested forms fields_for :prices, repeat forms few time
 

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    <p>i have many to many throught asociation and then i do this</p> <pre><code>fields_for :device </code></pre> <p>this displaying in good way, but i cannot save it i get unknown attribute :price <img src="https://i.stack.imgur.com/a7vUe.png" alt="fields_for :device"></p> <p>And <code>fields_for :devices</code></p> <p><img src="https://i.stack.imgur.com/swauG.png" alt="field_for :devices"></p> <p>And so on, one device makes one more repeat, if i write f<code>.fields_for :price</code> it gives good text field count, but it write </p> <pre><code>unknown attribute: price Rails.root: C:/Users/Ignas/mildai/baze4 Application Trace | Framework Trace | Full Trace app/controllers/commercial_offers_controller.rb:74:in `block in update' app/controllers/commercial_offers_controller.rb:73:in `update' </code></pre> <p>thank you</p> <p>additional information:</p> <p>controller </p> <pre><code> def edit_prices @commercial_offer = CommercialOffer.find(params[:id]) end </code></pre> <p>link to edit prices</p> <pre><code> &lt;%= link_to "Edit prices", :controller =&gt; "CommercialOffers", :action =&gt; "edit_prices", :id =&gt; @commercial_offer %&gt; </code></pre> <p>_edit_price.html.erb </p> <pre><code>&lt;%= form_for @commercial_offer do |f| %&gt; &lt;% CommercialOffer.find(params[:id]).devices.each do |device| %&gt; &lt;%= check_box_tag "commercial_offer[device_ids][]", device.id, @commercial_offer.devices.include?(device) %&gt; &lt;%= device.name %&gt; &lt;%= f.fields_for :prices do |builder| %&gt; &lt;%= render 'prices/new_price', :f =&gt; builder, :commercial_offer =&gt; @commercial_offer, :device =&gt; device %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;div class="actions"&gt; &lt;%= f.submit "Save"%&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>for one device it have render only one time, but it rendering for one device such times how many devices is with same commercial_offer_id</p> <pre><code>_new_price.html.erb Price: &lt;%= f.text_field :price %&gt;&lt;/br&gt; Quantity: &lt;%= f.text_field :quantity %&gt;&lt;/br&gt; Device id: &lt;%= f.text_field :device_id, :value =&gt; device.id %&gt;&lt;/br&gt; class CommercialOffer &lt; ActiveRecord::Base has_many :prices has_many :devices, :through =&gt; :prices accepts_nested_attributes_for :prices accepts_nested_attributes_for :devices end class Device &lt; ActiveRecord::Base has_many :prices accepts_nested_attributes_for :prices has_many :commercial_offer, :through =&gt; :prices class Price &lt; ActiveRecord::Base belongs_to :device belongs_to :commercial_offer end </code></pre>
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