Examples of new, create actions for has_many :through associations (nested)

Question

I found this code on http://guides.rubyonrails.org/association_basics.html#the-has_one-through-association:

class Document < ActiveRecord::Base
  has_many         


        

Answer 1

Hope this will help you:

Models:

class Document < ActiveRecord::Base
    has_many :sections
    has_many :paragraphs, :through => :sections
    accepts_nested_attributes_for :sections, :allow_destroy => true
    accepts_nested_attributes_for :paragraphs, :allow_destroy => true
end

class Section < ActiveRecord::Base
    belongs_to :document
    has_many :paragraphs
 end

class Paragraph < ActiveRecord::Base
    belongs_to :section
end

Controllers:

class DocumentsController < ApplicationController

    def new
        @document = Document.new
        @document.sections.build
        @document.paragraphs.build
    end
end

Views:

form_for @document do |f|

     ----document fields----------

     f.fields_for :sections do |s|
        ----sections fields----------
     end

     f.fields_for :paragraphs do |s|
          ----paragraphs fields----------
     end

end

Thanks