Question

How can I create a database table with a column that has a string length = 8 and decimal(2,2) using a rails 3 migration?

Answer 1

You’re right, it isn’t in the guide so you have to check the docs. See the column method:

http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/TableDefinition.html

add_table :foo do |t|
  t.string :foobar, :length => 8
  t.decimal :foobat, :precision => 4, :scale => 2
end