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:

Answer 1

This is my way: run:

$rails generate migration AddNetworkIdToUsers

then config migration file:

class AddNetworkIdToUsers < ActiveRecord::Migration[5.1]

  def up

    add_column :users, :network_id, :integer
    add_index  :users, :network_id
  end

  def down

    remove_index :users, :network_id
    remove_column :users, :network_id
  end

end