数据模型:
在我的理解中,这是您的数据模型(点击放大):
数据模型 http://yuml.me/6afcad62
移民:
迁移将使您在迁移级别满足您的第二个要求:
class CreateAwards < ActiveRecord::Migration
def self.up
create_table :awards do |t|
# custom attributes here
t.string :name
t.text :description
t.references :user, :null => false
t.references :game_week#, :null => false
t.references :badge, :null => false
t.timestamps
end
# a user can be awarded no more than a badge per week
add_index :awards, [:user_id, :badge_id, :game_week_id], :unique => true
# a user can be awarded no more than a badge for ever
#add_index :awards, [:user_id, :badge_id], :unique => true
end
def self.down
drop_table :awards
end
end
模型:
该模型将让您在模型级别满足您的两个要求:
class Award < ActiveRecord::Base
validate_uniqueness_of :user, :badge,
:if => Proc.new { |award| award.badge === BadgeA }
validate_uniqueness_of :user, :badge, game_week,
:unless => Proc.new { |award| award.badge === BadgeA }
#validate_uniqueness_of :user, :badge, game_week,
# :if => Proc.new { |award| award.badge === BadgeB }
end
笔记:
我没有尝试这些片段,但我认为这个想法就在这里:)