Question

I am trying to achieve a subsequent form submission. To clarify things –

• I submit a form for @post
• then once that @post is created I would immediately (under the hood) like to submit the form for @associations.
• The catch is, this second form submission would require the post_id field from the newly created @post.

What would be the best way to achieve this? Would nested forms help me pull the newly created @post.id? Kindly help me with this.

Answer 1

If this is something that should happen whenever you create a Post, then you should use active callbacks to achieve that :

class Post < ActiveRecord::Base

  after_create do |post|
    # create your association using post.id
  end

end

or, you can write it like that also :

class Post < ActiveRecord::Base

  after_create :after_create_post

  def after_create_post
    # create your association using self.id
  end

end

Otherwise, if this is something specific to a controller action, you should simple do something like this :

class PostsController < ApplicationController

  def create
    @post = current_user.posts.build(params[:post])
    # then use the @post.id to build your association. something like
    @post.associations.build(:prop1 => 'value1', :prop2 => 'value2')
  end

end

Hope this helps!