Creating Join Tables for has_many & belongs_to Associations

Question

Rails 3 newbie here... I'm working to create a devise auth system that like (yammer) has instances where users belong. I have two tables

Users (email, password...) belongs_to :instance

Instance (domain name, active....) has_many :users

I added the belongs_to and has_many to the models but the schema hasn't been updated to add the join, which I believe would be an instance_id column to the User's table. How does this get accomplished in Rails 3? Thoughts, suggestions?

Answer 1

You have to add these columns to the schema by migrations.

http://guides.rubyonrails.org/migrations.html

Try:

script/rails generate migration AddInstanceToUsers

then go to your db/migrations folder look for the new file and make it look like:

class AddInstanceToUsers < ActiveRecord::Migration 

  def self.up 

    add_column :users, :instance_id, :integer  

  end 

  def self.down 

    remove_column :users, :instance_id

  end

end

then run

rake db:migrate

in your console.