我使用的是从drnic复合主键宝石和我有它的问题: 如果我想创建一个CourseOrder(与有CPK)用下面的命令我测试:course_order = CourseOrder.new(:daily_order => daily_orders(:daily_order_one_of_today_for_hans),:course => courses(:non_veg_2), :finished => false, :ordered_at => Time.now)
,我会收到以下错误:问题与Rails的composite_primary_key宝石
ActiveRecord::StatementInvalid: PGError: ERROR: null value in column "course_iddaily_order_id" violates not-null constraint : INSERT INTO "course_orders" ("course_iddaily_order_id", "course_id", "ordered_at", "finished", "daily_order_id") VALUES (NULL, 489519433, '2011-03-01 10:19:27.169397', 'f', 594369222) RETURNING "course_iddaily_order_id"
我认为有一个course_iddaily_order_id是错误的,不是吗?
我的移民文件看起来像这样:
class AddCourseOrder < ActiveRecord::Migration
def self.up
create_table :course_orders, :primary_key => [:course_id, :daily_order_id] do |table|
table.integer :course_id
table.integer :daily_order_id
table.datetime :ordered_at, :null => false
table.boolean :finished, :default => false, :null => false
end
end
def self.down
drop_table :course_orders
end
end
生成的模式部分看起来是这样的:
create_table "course_orders", :primary_key => "course_iddaily_order_id", :force => true do |t|
t.integer "course_id", :null => false
t.integer "daily_order_id", :null => false
t.datetime "ordered_at", :null => false
t.boolean "finished", :default => false, :null => false
end
我的模型看起来是这样的:
class CourseOrder < ActiveRecord::Base
set_primary_keys :course_id, :daily_order_id
belongs_to :course
belongs_to :daily_order
end
我不知道这里错了什么,你能帮忙吗?
我认为“composite_primary_key”gem应该完全实现该功能。 – LeonS 2011-03-03 09:00:31