uninitialized constant add_column2::Tier3DiscountGroup

rubyonrails-talk
1

hi, im getting the error outlined in the subject. this is the migration:

add_column :tier_3_discount_groups, :description, :text unless Tier3DiscountGroup.column_names.include?(‘description’)

here is the model:

filename:

tier_3_discount_group.rb

content:

class Tier3DiscountGroup < ActiveRecord::Base

end

create-migration:

filename:

20141209204148_create_tier_3_discountount_groups.rb

content:

class CreateTier3DiscountountGroups < ActiveRecord::Migration

def change

create_table :tier_3_discountount_groups do |t|

t.string :name

t.timestamps

end

end

end

where is my mistake?

thx

2

you know there is a typo, right? “CreateTier3DiscountountGroups” (on database your table is named “tier_3_discountount_groups” or “tier_3_discount_groups”?). Also, you can use “column_exists?”, like this:

add_column :tier_3_discount_groups, :description, :text unless column_exists? :tier_3_discount_groups, :description

``