Reference

You can get all of this information on the command line.

rails generate with no generator name will output a list of all available generators and some information about global options. rails generate GENERATOR --help will list the options that can be passed to the specified generator.

rails generate scaffold Post name:string title:string content:text

rails generate model Post title:string body:text published:boolean

rails generate migration AddFieldToModel field:type

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

rails generate scaffold Post name:string title:string content:text slug:string:uniq

rails generate scaffold Post name:string title:string content:text slug:string:uniq

Modifiers are inserted through curly braces and they allow you to include things such as null and limit.

Add an age to a Friend with a limit

rails g model friend age:integer{2}  

Add a price to a product with 2 decimals

rails g model product 'price:decimal{10,2}'  	

Would result in a migration with a scale of 2 and percision of 10

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      ...
      t.decimal :price, precision: 10, scale: 2
      ...
      t.timestamps null: false
    end
  end
end

rails g model Supplier name:string
rails g model Product name:string:index sku:string{10}:uniq count:integer description:text supplier:references popularity:float 'price:decimal{10,2}' available:boolean availableSince:datetime image:binary	

Resulting migrations:

class CreateSuppliers < ActiveRecord::Migration
  def change
    create_table :suppliers do |t|
      t.string :name

      t.timestamps null: false
    end
  end
end

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :name
      t.string :sku, limit: 10
      t.integer :count
      t.text :description
      t.references :supplier, index: true, foreign_key: true
      t.float :popularity
      t.decimal :price, precision: 10, scale: 2
      t.boolean :available
      t.datetime :availableSince
      t.binary :image

      t.timestamps null: false
    end
    add_index :products, :name
    add_index :products, :sku, unique: true
  end
end

Documentation

rails generate rspec:model widget

will create a new spec file in spec/models/widget_spec.rb

The same generator pattern is available for all specs:

scaffold
model
controller
helper
view
mailer
observer
integration
feature
job

Generating specific views

rails g rspec:view widget index edit new show
      create  spec/views/widget
      create  spec/views/widget/index.html.erb_spec.rb
      create  spec/views/widget/edit.html.erb_spec.rb
      create  spec/views/widget/new.html.erb_spec.rb
      create  spec/views/widget/show.html.erb_spec.rb