Add additional result to the result of getting the Collection Proxy association

I have two models,

class User < ActiveRecord::Base
  has_many :posts
end

class Post < ActiveRecord::Base
  belongs_to: user
end

      

        
        
        
      

    

I am using formtastic gem

, consider in edit

action users_controller

. All required attributes user

and associated posts

form attributes will be filled in with a formal form

code:

<%= semantic_form_for @user do |f| %>

  <%= f.input :name %>

  <%= f.inputs :posts do |p| %>
    <%= p.input :title %>
    <%= p.input :comment %>
  <% end %>

<% end %>

      

        
        
        
      

    

For example, I have @user

two posts

. by doing @user.posts

, the result will be similar.

 [
  [0] #<Post:0x0000000aa53a20> {
                   :id => 3,               
                :title => 'Hello World',
              :comment => 'Long text comes here'
  },
  [1] #<Post:0x0000000aa53a41> {
                   :id => 5,               
                :title => 'Hello World 2',
              :comment => 'Long text comes here too'
  }
] 

      

        
        
        
      

    

Thus, the form will contain two fields for editing.

Actually, I want another blank post form before these two posts.

This can be easily achieved by inserting a new empty object post

into the result @object.posts

at position 0.

So the result @object.posts

I want should look exactly like,

    [
      [0] #<Post:0x0000000aa53a50> {
                       :id => nil,               
                    :title => nil,
                  :comment => nil
      },
      [1] #<Post:0x0000000aa53a20> {
                       :id => 3,               
                    :title => 'Hello World',
                  :comment => 'Long text comes here'
      },
      [2] #<Post:0x0000000aa53a41> {
                       :id => 5,               
                    :title => 'Hello World 2',
                  :comment => 'Long text comes here too'
      }
    ] 

      

        
        
        
      

    

Any solutions to get this structure from @user.posts

?