Hi Ken K., It is called name convention in rails. If your class is CreateVendors, your migration file should be xxx_create_vendors.rb ... ________________________________ From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Ken K. Sent: Tuesday, May 16, 2006 2:04 PM To: firstname.lastname@example.org Subject: RE: [Rails] rake aborted when adding a column I fixed it by changing the name of the migration from 002_ssn.rb to 002_add_ssn.rb. I have no idea why that worked, but it did the trick. Ken K. -- Kenneth A. Kousen, Ph.D. President Kousen IT, Inc. http://www.kousenit.com <http://www.kousenit.com/> email@example.com -------- Original Message -------- Subject: [Rails] rake aborted when adding a column From: Ken K. <firstname.lastname@example.org> Date: Tue, May 16, 2006 1:23 pm To: email@example.com I'm having a silly little problem with migrations. All I'm trying to do is to add an SSN column to my Employees table. I generated a migration which looks like: class AddSsn < ActiveRecord::Migration def self.up add_column :employees, :ssn, :string end def self.down remove_column :employees, :ssn end end When I run this, however, I get: >rake db:migrate (in C:/workspace/hr) rake aborted! uninitialized constant Ssn I tried running with --trace but I don't see how that helped. I did have the migration syntax wrong a couple of times, but now even though I think it's fine, it still doesn't work. Any suggestions would be appreciated. I'm running Ruby 1.8.4 with Rails 1.1.2 on Windows, btw. Ken K. -- Kenneth A. Kousen, Ph.D. President Kousen IT, Inc. http://www.kousenit.com <http://www.kousenit.com/> firstname.lastname@example.org ________________________________ _______________________________________________ Rails mailing list email@example.com http://lists.rubyonrails.org/mailman/listinfo/rails
on 2006-05-16 22:10
on 2006-05-16 22:13
I haven't had a problem using semi-arbitrary naming for my migrations. Examples include xxx_add_yyy, xxx_create_yyy, xxx_change_yyy, xxx_make_yyy. And the yyy in my examples is frequently NOT just the table name, so I am pretty sure that whatever naming conventions exist for migrations they are not strictly enforced by rake.
on 2006-05-16 22:29
Whoops, missed the nuance of what you were saying. Yes, the file name and migration class name must be the same. But the name for the migration doesn't have to match what you are doing (e.g. 002_add_vendors_column).