Migration fails need to reload attributes from model?

rubyonrails-talk
1

Whenever you use a Model class in a migration, you should define it *within* the migration class. This avoids problems related to the state of the model.

For example:

class AddProductSource < ActiveRecord::Migration    class Product < ActiveRecord::Base    end

   def self.up      add_column :products, :source, :string      Product.reset_column_information      Product.update_all('source = "something"')      add_index :products, [ :source, :vendor, :code ], :name => 'products_source_index'    end

   def self.down      remove_index :products, :name => 'products_source_index'      remove_column :products, :source    end end

You also need to call the .reset_column_information to force ActiveRecord to notice the changes that the migration has made to the database.

Try putting a "class State < ActiveRecord::Base; end" inside your migration 20 and see if that clears things up.

-Rob

Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com