Rails migration is giving NoMethodError and I do not see why - ruby-on-rails

Question

I do not know why this is breaking. I'm trying to run a migration on some code I've inherited and I've hit a snag. Here is the error message followed by the migration file code.
== AddStorecreditGizmoType: migrating ========================================
rake aborted!
NoMethodError: undefined method `find_by_name' for GizmoCategory(id: integer, description: string):Class
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/base.rb:1876:in `method_missing'
/home/thefonso/site-dev/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:175:in `method_missing_with_paginate'
db/migrate//20090628000954_add_storecredit_gizmo_type.rb:4:in `up'
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/migration.rb:282:in `block in migrate'
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/migration.rb:282:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/migration.rb:365:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/migration.rb:457:in `run'
/var/lib/gems/1.9.1/gems/activerecord-2.3.14/lib/active_record/migration.rb:409:in `run'
/var/lib/gems/1.9.1/gems/rails-2.3.14/lib/tasks/databases.rake:135:in `block (3 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
Tasks: TOP => db:migrate:up
(See full trace by running task with --trace)
Here is the migration file code
class AddStorecreditGizmoType < ActiveRecord::Migration
def self.up
# TODO: GizmoCategory.find_by_name("misc") is breaking...why? Attempted to replace with "where" but same error.
new = GizmoType.new(:name => "store_credit", :description => "Store Credit", :gizmo_category => GizmoCategory.find_by_name("misc"), :required_fee_cents => 0, :suggested_fee_cents => 0)
new.save!
DB.execute("UPDATE gizmo_contexts_gizmo_types SET gizmo_type_id = #{new.id} WHERE gizmo_type_id IN (SELECT id FROM gizmo_types WHERE name = 'gift_cert');")
end
def self.down
DB.execute("UPDATE gizmo_contexts_gizmo_types SET gizmo_type_id = (SELECT id FROM gizmo_types WHERE name = 'gift_cert') WHERE gizmo_type_id IN (SELECT id FROM gizmo_types WHERE name = 'store_credit');")
GizmoType.find_by_name("store_credit").destroy
end
end
I've tried using "where" and "Find_by" but I keep getting this same "undefined method blahblah for GizmoCategory
Can you point me in the right direction? What am I missing? forgetting? What's happening here?
Oh and versions are as follows
rails - 2.3.14
ruby - 1.9.3p194
Thanks

Answer 1

The find_by_* methods didn't exist in activerecord 2.3.14. Use Model.find instead.
category = GizmoCategory.find(:first, conditions: "name = 'store_credit'")
category.destroy if category