How to generate scaffold for data type with "extra description" in Rails 3?

Question

From Ruby on Rails: best method of handling currency / money, how do you generate a scaffold for the folowing:

add_column :items, :price, :decimal, :precision => 8, :scale => 2

Such as:

rails generate scaffold LineItem name:string \
                                 price:decimal {:precision => 8, :scale => 2}

Also, what is the correct term for "extra description" for the decimal type?

Working in Rails 3.07, Ruby 1.92

Answer 1

In Rails 3.1 and below, the syntax is

rails generate scaffold LineItem name:string price:decimal

and then manually add the decimal properties to the migration file

t.decimal :price, :precision => 8, :scale => 2

In Rails 3.2, one can specify the decimal properties

rails generate scaffold LineItem name price:decimal{8,2}

NOTE: If you are running ZSH, the syntax requires a hyphen instead of a comma.

rails generate scaffold LineItem name price:decimal{8-2}

ANOTHER NOTE: If you are using bash under Mac OS X 10.9 try a dot instead of the comma

rails generate scaffold LineItem name price:decimal{8.2}