Libs directory

rubyonrails-talk
1

Hello,

I had an application on Rails 1.2 or 1.1 (don't remember). Now I have updated it to 2.1.

I had a migrations_helper.rb in the Libs directory which defined foreign_key and drop_foreign_key methods. But now migrate task doesn't find them. Have I to include this directory somewhere with Rails 2.1? Doesn't it work as always?

Could I use another thing to declare foreign keys without having a class made by myself?

2

Any suggestion?

3

Eduardo Yáñez Parareda wrote:

Hello,

I had an application on Rails 1.2 or 1.1 (don't remember). Now I have updated it to 2.1.

I had a migrations_helper.rb in the Libs directory which defined foreign_key and drop_foreign_key methods. But now migrate task doesn't find them. Have I to include this directory somewhere with Rails 2.1? Doesn't it work as always?

Could I use another thing to declare foreign keys without having a class made by myself?

Depends how your code works, but I imagine you're extending the existing rails migration classes.

so I'd suggest doing a "require 'migration_extensions'" at the top of the migration file.

4

Depends how your code works, but I imagine you're extending the existing rails migration classes.

so I'd suggest doing a "require 'migration_extensions'" at the top of the migration file.

Yes, I already do it!...

This is my helper:

module MigrationHelpers   def foreign_key(from_table, from_column, to_table)     constraint_name = "fk_#{from_table}_#{from_column}"     execute %{alter table #{from_table}               add constraint #{constraint_name}               foreign key (#{from_column})               references #{to_table} (id)}   end

  def drop_foreign_key(table, foreign_key)     execute %{alter table #{table} drop foreign key #{foreign_key}}   end end

and this is my migration class:

require 'migration_helpers'

class CreateProjectUserRoles < ActiveRecord::Migration   def self.up     create_table :project_user_roles do |t|       t.references :project       t.references :user       t.string :role, :null => false

      t.timestamps     end     foreign_key :project_user_roles, :user_id, :users     foreign_key :project_user_roles, :project_id, :projects   end

  def self.down

drop_foreign_key :project_user_roles, :fk_project_user_roles_user_id

drop_foreign_key :project_user_roles, :fk_project_user_roles_project_id     drop_table :project_user_roles   end end

Helper is into 'lib' directory, so I think it is loaded when server starts. Well Indeed it worked in RoR 1.2.

5

Well, I'm feeling stupid....

I forgot to extend the migration class in order to use the foreign key Module...