javascript - Remove object fields by updating the complete object -


this data stored in mongodb document:

{      _id: "123"     order: 1     parent: "dueqmd64ntxm3u9cm"     type: "article"     unit: "kg" }

while saved data calculated , validated first (that's why don't use data = { order: 2 }), i'm using complete object update document:

var data = {      order: 2     parent: "dueqmd64ntxm3u9cm"     type: "article"     unit: "kg" }  collection.update(     { _id: 123 },      { $set: data } );

this working.

but if want remove values, doesn't work:

var data = {      order: 2     parent: "dueqmd64ntxm3u9cm"     type: "article"     unit: undefined }  collection.update(     { _id: 123 },      { $set: data } );

i'm expecting unit-field removed. isn't case...

to remove fields, use $unset operator:

data = {     unit: "" }; collection.update(     { _id: 123 },      { $set: data } );

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