mongodb 如何通过一次调用将一组对象推送到 mongoose 中的数组中？
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How to push an array of objects into an array in mongoose with one call?
提问by Pranil Dasika
I need to push multiple values into an array in mongoose using one call. I tried doing it using a smaller array but the array is getting inserted as a sub-array.
我需要使用一次调用将多个值推送到 mongoose 中的一个数组中。我尝试使用较小的数组来执行此操作，但该数组已作为子数组插入。
var kittySchema = new mongoose.Schema({
name: String,
values: [Number]
});
var Kitten = db.model('Kitten', kittySchema);
Kitten.update({name: 'fluffy'},{$push: {values:[2,3]}},{upsert:true},function(err){
if(err){
console.log(err);
}else{
console.log("Successfully added");
}
});
The result of the calling the above code thrice gives the below result:
三次调用上述代码的结果如下：
{ "_id" : ObjectId("502b0e807809d79e84403606"), "name" : "fluffy", "values" : [ [ 2, 3 ], [ 2, 3 ], [ 2, 3 ] ] }
Whereas what I want is something like this:
而我想要的是这样的：
{ "_id" : ObjectId("502b0e807809d79e84403606"), "name" : "fluffy", "values" : [ 2, 3 ,2 ,3, 2, 3] }
Another thing I noticed was that the type in the array (values) is specified as Number, then wouldnt the 'strict' option ensure that anything other than Numbers are not inserted ? In this case another array is being allowed to be inserted.
我注意到的另一件事是数组中的类型（值）被指定为数字，那么“严格”选项不会确保不插入数字以外的任何内容吗？在这种情况下，允许插入另一个数组。
采纳答案by Amit Portnoy
(Dec-2014 update)Since MongoDB2.4 you should use:
（2014 年 12 月更新）从 MongoDB2.4 开始，您应该使用：
Kitten.update({name: 'fluffy'}, {$push: {values: {$each: [2,3]}}}, {upsert:true}, function(err){
if(err){
console.log(err);
}else{
console.log("Successfully added");
}
});
回答by Stennie
Deprecatedsee other solution below using $push $each
不推荐使用 $push $each 查看下面的其他解决方案
Your example is close, but you want $pushAllrather than $pushto have each value added separately (rather than pushing another array onto the valuesarray):
您的示例很接近，但您希望$pushAll而不是$push分别添加每个值（而不是将另一个数组推送到values数组上）：
var Kitten = db.model('Kitten', kittySchema);
Kitten.update({name: 'fluffy'},{$pushAll: {values:[2,3]}},{upsert:true},function(err){
if(err){
console.log(err);
}else{
console.log("Successfully added");
}
});
回答by Dominic
Or use the $each modifier with $addToSet:
或者在 $addToSet 中使用 $each 修饰符：
https://docs.mongodb.com/manual/reference/operator/update/addToSet/#each-modifier
https://docs.mongodb.com/manual/reference/operator/update/addToSet/#each-modifier
// Existing tags array { _id: 2, item: "cable", tags: [ "electronics", "supplies" ] } // Add "camera" and "accessories" to it db.inventory.update( { _id: 2 }, { $addToSet: { tags: { $each: [ "camera", "accessories" ] } } } )
// Existing tags array { _id: 2, item: "cable", tags: [ "electronics", "supplies" ] } // Add "camera" and "accessories" to it db.inventory.update( { _id: 2 }, { $addToSet: { tags: { $each: [ "camera", "accessories" ] } } } )
