如何相互链接/添加模型

Question

I'm trying to add idea(s) to a user . So far I added has_many to my user and belongs_to to my idea. And I added a foreign key to User using:

rails g migration Add_User_id_To_Ideas user_id:integer

Now, how do I assign the idea to the specific user, when a user creates a new idea? I tried to work parallel to this example , but I'm a bit stuck.

user.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_many :ideas
end

idea.rb

class Idea < ActiveRecord::Base
  belongs_to :user
  has_many :comments

  mount_uploader :picture, PictureUploader
  # {attr_accessor :Status}
  enum status: [ :Draft, :Published]
end

Answer 1

Several ways to do this, but I think the most straight forward way would be to save the user_id in the ideas controller create action.

# def create inside ideas_controller
@idea.user_id = current_user.id

if @idea.save
  # etc

Couple other options are a hidden field or before_save callback. Here's an example of passing through a hidden field. In your @idea form:

<%= f.hidden_field :user_id, value: current_user.id %>

This will add user_id to the params being saved. Make sure that :user_id is whitelisted in the permitted params at the bottom of your ideas controller.

To permit user_id in idea_params :

def idea_params
  params.require(:idea).permit(:user_id, :also_add_other_params)
end