MongoDB updateMany不是函数

Question

I'm using mongodb 3.6.3

db.version() 3.6.3

I have test collection:

> db.test.find()
{ "_id" : ObjectId("5c582787e504df9ad201ba77"), "val" : 0.25 }
{ "_id" : ObjectId("5c582789e504df9ad201ba78"), "val" : 1 }
{ "_id" : ObjectId("5c58278be504df9ad201ba79"), "val" : 10 }
{ "_id" : ObjectId("5c58278fe504df9ad201ba7a"), "val" : 11122 }

And I want to divide all values. Due for this I've tried to use updateMany

> db.test.updateMany({}, {$mul: {val: 0.5}})
2019-02-04T17:08:27.548+0500 TypeError: Property 'updateMany' of object local.test is not a function
> db.test.update({}, {$mul: {val: 0.5}}, {multi:true})
WriteResult({ "nMatched" : 4, "nUpserted" : 0, "nModified" : 4 })
> db.test.find()
{ "_id" : ObjectId("5c582787e504df9ad201ba77"), "val" : 0.125 }
{ "_id" : ObjectId("5c582789e504df9ad201ba78"), "val" : 0.5 }
{ "_id" : ObjectId("5c58278be504df9ad201ba79"), "val" : 5 }
{ "_id" : ObjectId("5c58278fe504df9ad201ba7a"), "val" : 5561 }

Why there is no updateMany function?

Answer 1

updateMany has been introduced in version 3.2 since you're using mongo shell with version 2.6.10, it's missing there. You need to update your CLI and it should work as expected.