A list of types you can use in the Rails migration dsl

create_table_types.rb

def change
  create_table :table do |t|
    t.column # adds an ordinary column. Ex: t.column(:name, :string)
    t.index # adds a new index.
    t.timestamps
    t.change # changes the column definition. Ex: t.change(:name, :string, :limit => 80)
    t.change_default # changes the column default value.
    t.rename # changes the name of the column.
    t.references
    t.belongs_to #alias for references
    t.string
    t.text
    t.integer
    t.float
    t.decimal
    t.datetime
    t.text
    t.timestamp
    t.time
    t.date
    t.binary
    t.boolean
    t.remove
    t.remove_references
    t.remove_belongs_to
    t.remove_index
    t.remove_timestamps
  end
end