Migration: 'unique' column constraint

I’m using a legacy sqlite3 database for an app I’m developing. I’m
trying to create a migration that creates a table containing a column
with a ‘unique’ constraint. Here’s my migration:

class CreateEvents < ActiveRecord::Migration
def self.up
create_table :events do |t|
#execute “name text NOT NULL UNIQUE”
t.column :name, :text, :null => false, :unique => true
t.column :cmd, :text, :null => false
t.column :valid, :integer, :null => false
t.column :arg1, :text
t.column :arg2, :text
t.column :arg3, :text
t.column :arg4, :text
t.column :arg5, :text
end
end

def self.down
drop_table :events
end
end

The :unique constraint was quietly ignored by the migration, so the name
column ended up looking like this: “name text NOT NULL”. I also tried
executing the equivalent sql in place of the “t.column :name” statement,
but received an invalid sql error: “SQLite3::SQLException: near “name”:
syntax error: name text NOT NULL UNIQUE”.

I can’t create the column after the table creation becaues sqlite3
doesn’t support the ‘unique’ constraint in an “ALTER TABLE” statement.

Any ideas on how I can make the ‘name’ column unique? This must be done
in the schema, not in the model, because other apps already use the
current schema.

Thanks,
Earle

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs