Ruby on Rails generates model field:type - what are the options for field:type?

:primary_key, :string, :text, :integer, :float, :decimal, :datetime, :timestamp,:time, :date, :binary, :boolean, :references

See the table definitions section.

To create a model that references another, use the Ruby on Rails model generator:

$ rails g model wheel car:references

That produces app/models/wheel.rb:

class Wheel < ActiveRecord::Base  belongs_to :carend

And adds the following migration:

class CreateWheels < ActiveRecord::Migration  def self.up    create_table :wheels do |t|      t.references :car      t.timestamps    end  end  def self.down    drop_table :wheels  endend

When you run the migration, the following will end up in your db/schema.rb:

$ rake db:migratecreate_table "wheels", :force => true do |t|  t.integer  "car_id"  t.datetime "created_at"  t.datetime "updated_at"end

As for documentation, a starting point for rails generators is Ruby on Rails: A Guide to The Rails Command Line which points you to API Documentation for more about available field types.

$ rails g model Item name:string description:text product:references

I too found the guides difficult to use. Easy to understand, but hard to find what I am looking for.

Also, I have temp projects that I run the rails generate commands on. Then once I get them working I run it on my real project.

Reference for the above code: http://guides.rubyonrails.org/getting_started.html#associating-models