如何使用Mongoose删除对象内的子文档

我正在尝试使用Mongoose从Object中删除带有ID的子文档。 我试图在Moongose中使用更新function,但在运行脚本即时通讯状态“好:1”,但状态“nModified:0”。 正在尝试使用以下脚本:

Page.update({"subPages._id": req.body.ID}, {"$unset":{"subPages":1}}, function (re,q) { console.log(q); }); 

此脚本从对象中删除所有子文档。 这是我的JSON:

 { "_id" : ObjectId("585a7a7c2ec07b40ecb093d6"), "name_en" : "Head Page", "name_nl" : "Head Page", "slug_en" : "Head-page", "slug_nl" : "hoofd-menu", "content_en" : "<p>Easy (and free!) You should check out our premium features.</p>", "content_nl" : "<p>Easy (and free!) You should check out our premium features.</p>", "date" : ISODate("2016-12-21T12:50:04.374Z"), "is_footerMenu" : 0, "is_headMenu" : 0, "visible" : 1, "__v" : 0, "subPages" : [ { "content_nl" : "<p>Easy (and free!) You should check out our premium features.</p>", "content_en" : "<p>Easy (and free!) You should check out our premium features.</p>", "slug_nl" : "Sub-page", "slug_en" : "Sub-page", "name_nl" : "Subpage", "name_en" : "Subpage", "date" : ISODate("2016-12-21T14:58:44.733Z"), "subPages" : [], "is_footerMenu" : 0, "is_headMenu" : 0, "visible" : 1, "_id" : ObjectId("585a98a46f657b52489087a8") }, { "content_nl" : "<p>Easy (and free!) You should check out our premium features.</p>", "content_en" : "<p>Easy (and free!) You should check out our premium features.</p>", "slug_nl" : "Subpage", "slug_en" : "Subpage", "name_nl" : "Subpage1", "name_en" : "Subpage1", "date" : ISODate("2016-12-21T14:58:54.819Z"), "subPages" : [], "is_footerMenu" : 0, "is_headMenu" : 0, "visible" : 1, "_id" : ObjectId("585a98ae6f657b52489087a9") } ] 

}

我想要删除带有ID的子对象

 585a98a46f657b52489087a8 

我该怎么做?

为了从数组中删除一个元素(子文档),你需要$拉它。

 Page.update({ 'subPages._id': req.body.ID }, { $pull: { subPages: { _id: req.body.ID } } }, function (error, result) { console.log(result); }); 

如果你想删除所有的子文档(即使子subPages为空),你可以设置它的值为一个空的数组。

 Page.update({ 'subPages._id': req.body.ID }, { $set: { subPages: [] } }, function (error, result) { console.log(result); }); 

希望能帮助到你。