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create table foo  (id, name)
create table foo_config (id, foo_id, key, value)

insert into foo (1, 'name1')
insert into foo (2, 'name2')
insert into foo (3, 'name3')

insert into foo_config (1, 1, 'key1', 'val1')
insert into foo_config (2, 1, 'key2', 'val2')
insert into foo_config (3, 1, 'key3', 'val3')
insert into foo_config (4, 2, 'key1', 'val1')
insert into foo_config (5, 3, 'key2', 'val2')

我如何查询所有 foo key1 = 'val1',在我们的例子中 foo:1 和 foo:2 将在此处列出。我应该如何为此建模/查询,感谢任何相同的指针。

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1 回答 1

0

首先,您必须构建模型并设置关联:

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

class FooConfig < ActiveRecord::Base
  belongs_to :foo
end

以下是您设置查询的方式:

Foo.where(:foo_configs => {:key => 'key1', :value => 'value1'}).includes(:foo_configs)
于 2012-02-10T17:19:41.357 回答