Genshin/spree_warehouse — Issue #9: migrations : table_name 
Author: kalkov
Created: 2012-01-24 08:42:52+00:00
State: open

Everything must be namespaced with spree

So this :
class CreateVisualCodeTypes < ActiveRecord::Migration
create_table :visual_code_types do |t|
end
end

Must be :
class CreateSpreeVisualCodeTypes < ActiveRecord::Migration
create_table :spree_visual_code_types do |t|
end
end