## Command Line Generator Info

[Reference](https://stackoverflow.com/questions/12900170/is-there-a-reference-cheat-sheet-for-rails-generate-command)

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 Examples
#### Create a Resource
	rails generate scaffold Post name:string title:string content:text

#### Generate Models
	rails generate model Post title:string body:text published:boolean

#### Add Column to Existing Model
	rails generate migration AddFieldToModel field:type

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

#### Adding a Unique Property to a Field

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

#### Adding a Unique Property to a Field

	rails generate scaffold Post name:string title:string content:text slug:string:uniq
	
#### Adding Modifiers [Reference](http://www.chrisjmendez.com/2016/07/01/rails-cheatsheet/)

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
```


	
#### Create a new model with a reference to another model [Reference](https://www.ralfebert.de/snippets/ruby-rails/models-tables-migrations-cheat-sheet/) 

	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
```

## Rspec Generators
 [Documentation](https://relishapp.com/rspec/rspec-rails/docs/generators)
  
    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
```