MaxInterview - mongodb remove from array

showing results for - "mongodb remove from array"

María Alejandra

1TemplateDoc.findOneAndUpdate(
2    { userId: _id },
3    { $pull: { templates: { _id: templateid } } },
4    { new: true }
5  )
6    .then(templates => console.log(templates))
7    .catch(err => console.log(err));

1// query
2db.stores.update(
3    { },
4    { $pull: { fruits: { $in: [ "apples", "oranges" ] }, vegetables: "carrots" } },
5    { multi: true }
6)
7
8// sample data
9{
10   _id: 1,
11   fruits: [ "apples", "pears", "oranges", "grapes", "bananas" ],
12   vegetables: [ "carrots", "celery", "squash", "carrots" ]
13}
14{
15   _id: 2,
16   fruits: [ "plums", "kiwis", "oranges", "bananas", "apples" ],
17   vegetables: [ "broccoli", "zucchini", "carrots", "onions" ]
18}
19

1> db.removeArrayElementByItsIndexDemo.update({}, {$unset : {"InstructorSubject.2" : 1 }});
2WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

1db.example.update({}, [
2     {$set: {field: {
3           $concatArrays: [ 
4                  {$slice: ["$field", P]}, 
5                  {$slice: ["$field", {$add: [1, P]}, {$size: "$field"}]}
6           ]
7     }}}
8]);
9

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