如何在ActiveRecord中删除具有相关记录的多个记录

Question

create table foo (id, name, order, ...);
create table foo_bar (id, foo_id, name, value);

foo包含值为(1,2,3,4,5,... 10)的order列,假设foo_bar包含每个foo的多个记录.

如何删除订单值为3..6及其相关记录的foos？

Answer 1

class Foo < ActiveRecord::Base
  has_many :foo_bars,  :dependent => :destroy
end

class FooBar < ActiveRecord::Base
  belongs_to  :foo
end

如果您的关系如上所述,则以下代码将起作用

Foo.delete_all(["id in (?)", [3,4,5,6]])

要不就

Foo.delete([3,4,5,6])

参考删除

EDITED

从小知道我知道你的问题我认为你有类似跟随的东西

foo表

id  some_column    order
1   some_value      3
2   some_value      4
3   some_value      3
4   some_value      2
5   some_value      1
6   some_value      5
7   some_value      6

foo_bar表

id  some_column    foo_id
1   some_value      2
2   some_value      1
3   some_value      3
4   some_value      2
5   some_value      4
6   some_value      5
7   some_value      6

然后用户关注order而不是id

Foo.delete_all(["order in (?)", [3,4,5,6]])