Arrays Mongodb-查询对象数组,但只返回一个属性
我不认为这是重复的,但如果我错了,请纠正我。无论如何,我只想返回“apple”和与用户对象电子邮件地址匹配的客户成员角色。我使用$elemMatch,但它返回整个customer对象,我只需要“member”属性,就是这样Arrays Mongodb-查询对象数组,但只返回一个属性,arrays,node.js,mongodb,mongoose,mongodb-query,Arrays,Node.js,Mongodb,Mongoose,Mongodb Query,我不认为这是重复的,但如果我错了,请纠正我。无论如何,我只想返回“apple”和与用户对象电子邮件地址匹配的客户成员角色。我使用$elemMatch,但它返回整个customer对象,我只需要“member”属性,就是这样 { "_id" : ObjectId("54d24e5df2878d40192beabd"), "apple" : "yes", "orange" : "yes", "customers" : [ {
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"orange" : "yes",
"customers" : [
{
"name" : "Jay Smith",
"email" : "jaysmith@example.com",
"member" : "silver",
},
{
"name" : "Sarah Carter",
"email" : "sarahcarter@example.com",
"member" : "gold",
},
{
"name" : "Jack Whatever",
"email" : "jackwhatever@example.com",
"member" : "gold",
},
]
}
理想的结果是:
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"member" : "gold"
}
或者,这就足够了:
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"orange" : "yes",
"customers" : [
{"member" : "gold"}
]
}
这就是我目前拥有的:
ItemsModel.find({ _id: { $in: _.pluck(user.items, 'itemId') }, active: true},
{apple: 1, customers: {$elemMatch: {email: user.email}} },
function(error, items) {
if (error) { return next(error); }
req.payload = {};
req.payload.items = items;
next();
});
任何帮助都将不胜感激。这可能吗?谢谢
ItemsModel.aggregate([
{ $unwind: '$customers' },
{ $match: { _id: { $in: _.pluck(user.items, 'itemId'), 'customers.email': user.email } },
{ $project : { _id:1 , apple:1, member:'$customers.member' }}
], function(err, res){
// rest of your code here
})
我会给你
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"member" : "gold"
}
我会给你
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"member" : "gold"
}
我会给你
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"member" : "gold"
}
我会给你
{
"_id" : ObjectId("54d24e5df2878d40192beabd"),
"apple" : "yes",
"member" : "gold"
}
我以客户身份获得:[“会员”:“黄金”],而不是“会员”:“黄金”,但我仍会将此标记为正确答案。天才的东西。非常感谢。Oops,应该是成员:“$customers.member”。我已经修改了我的回答,我以客户身份获得:[“会员”:“黄金”],而不是“会员”:“黄金”,但我仍会将此标记为正确答案。天才的东西。非常感谢。Oops,应该是成员:“$customers.member”。我已经修改了我的回答,我以客户身份获得:[“会员”:“黄金”],而不是“会员”:“黄金”,但我仍会将此标记为正确答案。天才的东西。非常感谢。Oops,应该是成员:“$customers.member”。我已经修改了我的回答,我以客户身份获得:[“会员”:“黄金”],而不是“会员”:“黄金”,但我仍会将此标记为正确答案。天才的东西。非常感谢。Oops,应该是成员:“$customers.member”。我修改了我的答案