Question

我正试图从下面的对象中删除第二部分。我知道要删除的section_id对象的section，下面的代码返回1，好像删除了1条记录，但实际上没有删除section个对象。

我做错了什么，我该如何解决？

示例对象

{
  _id: 'asdfjklsfo',
  name: 'My name',
  sections: [
    {
      section_id: 'asdflasdf', <-- This is an actual mongo ObjectID
      title: 'My title'
    },
    {
      section_id: 'asdflnmasdf', <-- This is an actual mongo ObjectID
      title: 'Second title'
    }
  ]
}

更新代码段

var collection = db.get('notes');
collection.update(
        { _id: id },
        { $pull: { sections: {section_id : section_id}}},

        function(err, num_modified) {

            // If it failed, return error
            if (err) {
                res.send("There was a problem deleting that note from the database.");
            } else {
                console.log(num_modified); <-- this is 1
                console.log('were in delete success');
                res.send(204);
            }
        }
    );

Answer 1

我似乎必须这样做collection.id(section_id)：

collection.update(
        { _id: id },
        { $pull: { sections: {section_id : collection.id(section_id)}}},

        function(err, num_modified) {

            // If it failed, return error
            if (err) {
                res.send("There was a problem deleting that note from the database.");
            } else {
                console.log(num_modified); <-- this is 1
                console.log('were in delete success');
                res.send(204);
            }
        }
    );

由于我使用的是Monk库，我从中得到了它：https://github.com/LearnBoost/monk#casting

Mongo collection.update不删除元素，即使它返回1作为更新的对象数

1 个答案: