When attempting to modify an existing document in a MongoDb collection, an exception is generated with the following message:
javascript execution failed : can't save a DBQuery object at src/mongo/shell/collection.jsThe following actions are performed in the mongoDb shell:
> var doc1 = db.users.find({name:"Harmeet"})
> doc1.color = "Blue"
> db.users.save(doc1)
However, when the save method is called, the exception is thrown.
for the best results,
let document = db.users.findOne({name:"Harmeet"})db.users.find gives back a cursor.
Even though @Manuel Rony Gomes provided a solution to the problem, if you need to transfer multiple documents from collection A to collection B simultaneously, the toArray() method can help streamline the process:
db.collectionB.insertMany(db.collectionA.find({}).toArray())
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