uninitialized constant add_column2::Tier3DiscountGroup

[tom]

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

[Daniel Loureiro]

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

--

Daniel Loureiro

http://www.learnwithdaniel.com