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    <p>your User model not attached to photos so photos only are belongs to Product model so you need to change your User model to be </p> <pre><code> class User &lt; ActiveRecord::Base has_many :products has_many :photos,:through=&gt;:products end </code></pre> <p>then you can fetch User photos through </p> <pre><code> @photos =current_user.photos </code></pre> <p>or you can build a photo easily </p> <pre><code>@photo = current_user.photos.build(params[:photo]) </code></pre> <p>also in your views you need to do instead of = f.file_field :photo, multiple: 'multiple'</p> <p>use </p> <pre><code>= fields_for :photos do |f_i| =f_i.file_field :image </code></pre> <p>try it .</p> <p>these is the simple way for has many through association </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>you can check these guide for more info</p> <p><a href="http://guides.rubyonrails.org/association_basics.html" rel="nofollow">http://guides.rubyonrails.org/association_basics.html</a> also you need to put </p> <pre><code> accepts_nested_attributes_for :photos </code></pre> <p>inside your Product model</p> <p>for a complete tutorial about nested forms you can watch these screen cast </p> <p><a href="http://railscasts.com/episodes/196-nested-model-form-revised" rel="nofollow">http://railscasts.com/episodes/196-nested-model-form-revised</a></p> <p>its not free </p> <p>you can watch these free screen cast if your not subscribed to railscasts.com </p> <p><a href="http://railscasts.com/episodes/196-nested-model-form-part-1" rel="nofollow">http://railscasts.com/episodes/196-nested-model-form-part-1</a></p> <p><a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="nofollow">http://railscasts.com/episodes/197-nested-model-form-part-2</a></p>
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    1. PORuby on rails - paperclip not saving to database
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    1. USRemon Amin
    1. USRemon Amin
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      1. VTUpMod
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    1. COHmnn i did that change did bundle exec rake db:migrate then restarted the server but i still get the same error
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      1. USAlain Goldman
    2. COcheck my updated answer
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    3. COI updated it again to meet your question
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      1. USRemon Amin
 

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