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

Question

I'm trying to generate a new model and forget the syntax for referencing another model's ID. I'd look it up myself, but I haven't figured out, among all my Ruby on Rails documentation links, how to find the definitive source.

$ rails g model Item name:string description:text (and here either reference:product or references:product). But the better question is where or how can I look for this kind of silliness easily in the future?

Note: I've learned the hard way that if I mistype one of these options and run my migration then Ruby on Rails will totally screw up my database... and rake db:rollback is powerless against such screwups. I'm sure I'm just not understanding something, but until I do... the "detailed" information returned by rails g model still leaves me scratching...

Answer 1

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

See the table definitions section.

Answer 2

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 :car end 

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   end end 

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

$ rake db:migrate  create_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.