Unpermitted parameters in a simple rails application -

After the

I started my application using scaffolding:

  Rail G scaffolding Category titled G Scaffold Rail Product Category: Reference Title Rake db: Uninstalled  

I started the server and created a new category and then I used it to create a new product for this category id wanted to add 1 but when I checked the log:

  started POST "/ answer Adon "to make as HTML parameters 2014-08-01 09:28:16 + 0430 processing ProductsController # on 127.0.0.1: {" UTF8 "= & gt; "✓", "authenticity_token" = & gt; "Dd7tvD / DrXf1SiAnCR6ZUvtwQzVuy39HG4A9dmo7Gms =", "Product" = & gt; {"Category" = & gt; "1", "title" = & gt; "Rail"}, "committed" => "Create product"} unpermitted parameters: Category  

and in category_id is the product contorller allowed parameter:

  def product_params Params.require (: Products) .permit (: category_id, Title: End)  

EDIT :

Model:

  class products & lt; ActiveRecord :: Base is_to: category end class category & lt; ActiveRecord :: Base End  

Product form:

  & lt;% = form_for (@product). F | & Gt%; & Lt;% if @products.rors.ei? & Gt%; & Lt; Div id = "error_explanation" & gt; & Lt; H2 & gt; & Lt;% = Plural (@producer.rors coat, "error")%> Banned from saving this product: & lt; / H2 & gt; & Lt; Ul & gt; & Lt;% @ product.errors.full_messages.each do | Msg | | & Gt%; & Lt; Li & gt; & Lt;% = msg% & gt; & Lt; / Li & gt; & Lt;% end% & gt; & Lt; / Ul & gt; & Lt; / Div & gt; & Lt;% end% & gt; & Lt; Div class = "field" & gt; & Lt;% = f.label: catagory% & gt; & Lt; Br> & Lt;% = f.text_field: catagory% & gt; & Lt; / Div & gt; & Lt; Div class = "field" & gt; & Lt;% = f.label: Title% & gt; & Lt; Br> & Lt;% = f.text_field: Title% & gt; & Lt; / Div & gt; & Lt; Div class = "verb" & gt; & Lt;% = f.submit% & gt; & Lt; / Div & gt; & Lt;% end% & gt;  

Can you help me? Are you doing wrong

In your form_for tag, you have the category Instead of the field to category_id ask for)

  <% = f.label: catagory_id%> & Lt; Br> & Lt;% = f.text_field: catagory_id% & gt;  

In addition to the answer, the relationship between products and category is not appropriate. You are missing from has_many

Your category should look like this model:

  class category & lt; ActiveRecord :: Base is - Medium: End of Products