提交表单时，Rails 4参数不嵌套

Question

I am using Rails 4 and nested forms. I want to associate the models so the model named Lead is the parent and associated with the model named QuoteMetal. I want someone to submit the forms and have rails write the information from the forms into tables of the database. Here are my models:

class Lead < ActiveRecord::Base
    has_many :quote_metals
    accepts_nested_attributes_for :quote_metals
end
class QuoteMetal < ActiveRecord::Base
  belongs_to :lead
end

Here is the form:

  <%= form_for @lead, class: 'form-horizontal' do |f| %>
      <%= f.label :name %>
      <%= f.text_field :name, class: "form-control" %>

      <%= f.label :notes %>
      <%= f.text_area :note, class: "form-control" %>

    <%= fields_for @quote_metal do |ff| %>       
            <%= ff.label :weight %><br>
            <%= ff.number_field :weight, class: "form-control" %>
                 ....
    <% end %>

    <%= f.submit "Submit" %>

  <% end %>

And my controller:

class LeadsController < ApplicationController

  def index
    @lead = Lead.new
    @quote_metal = @lead.quote_metal.build
  end

  def create
    raise params.inspect
  end

  def show
  end

private

    def lead_params
        params.require(:lead).permit([:name, ..., 
            quote_metal: [:weight....])
    end

end

The output params I get is not nested. It looks like:

{"utf8"=>"✓",
 "authenticity_token"=>"JYO/Yt/QBlytHsQaRe9+stzZvZn6xCI7ukeypMZZjpgnowktFcllLhhb2qXK/+45V5l+qJFg/5b4/yZdWLPvGg==",
 "lead"=>{"name"=>"Dick",...,"note"=>"asdf"},
 "quote_metal"=>{"weight"=>"65.20",....},
 "commit"=>"Submit"}

How do I get the params to be nested and then write those nested params to a the tables that correspond to the models - one table for the lead and one table for the metal.

Answer 1

Change

    <%= fields_for @quote_metal do |ff| %>

To

    <%= f.fields_for @quote_metal do |ff| %>

Prefixing fields_for with the form builder for the parent will scope this properly for you.

Separately, you might also consider refactoring your quote_metal nested view into a partial.