Create_table with unique combo

I need to create a table replacing default integer id with a string id
and making a combo of (id and version) unique primary key. Here is
what I’ve got so far.

class CreateCatalogs < ActiveRecord::Migration
def self.up
create_table :catalogs, :id => false do |t|
t.string :id, :limit => 20, :null => false
t.string :version, :default => ‘01’



def self.down
drop_table :catalogs

alternatively if i leave default integer id as primary key I need to
make sure combo of name and version are unique.

create_table :catalogs do |t|
  t.string :name
  t.string :version, :default => '01'

On Thu, Apr 9, 2009 at 6:56 AM, slava [email protected] wrote:

To ensure uniqueness, you can add an index

add_index :catalogs, [:name, :version], :unique => true

Andrew T.

“I have never let my schooling interfere with my education” - Mark Twain

hi slave,you can do it use the connection method of migration
use it like ActiveRecord::Base.connection_pool.checkout

2009/4/9 slava [email protected]


on the same subject…
I need to ensure uniqness of name in a table. I tried setting collumn
to unique (see below) but that did not work. I still can create
records with same name field.

create_table :properties do |t|
t.string :name, :unique => true
t.string :description


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