How to setup a one to many relationship?

Question

I have the following models:

User (id, name, network_id) Network(id, title) 

What kind of Rails model assoc do I need to add so that I can do:

@user.network.title @network.users 

Thanks

Answer 1

so network has_many users and a user belongs_to network.

Just add a network_id to users table if you still haven't and also since it's a foreign_key is worth indexing it.

rails generate migration AddNetworkIdToUsers

class AddNetworkIdToUsers < ActiveRecord::Migration   def change     add_column :users, :network_id, :integer     add_index  :users, :network_id   end end 

In the network model do:

class Network < ActiveRecord::Base   has_many :users end 

In the user model do:

class User < ActiveRecord::Base   belongs_to :network end 

Answer 2

According to your database-setup, you just have to add the following lines to your models:

class User < ActiveRecord::Base   belongs_to :network   # Rest of your code here end  class Network < ActiveRecord::Base   has_many :users   # Rest of your code here end 

In case you have a setup without network_id, you should go with daniels answer.