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我有这种情况:的has_many和总和named_scope
Stories has many Tasks
Tasks have an integer called hours_left
我需要一个命名范围,找到其中的所有任务已大于0时朝故事。
基于 this post。我写到:
class Story
has_many :tasks
named_scope :uncompleted, {
:joins=>["INNER JOIN tasks ON tasks.story_id = stories.id"],
:group=> 'stories.id',
:select=>'stories.*, SUM(tasks.hours_left) AS sum_amount',
:having=>"sum_amount > 0"
}
end
但是Story.uncompleted
返回一个空数组。
你能帮我吗?
我也注意到,如果我删除了:具有=>“sum_amount> 0”条件我得到的所有的故事:那些以0分朝具有属性HOURS_LEFT设置为“0”,但其余的(那些我想要的)有hours_left设为零。 –