Find difference between 2 documents on mongoDB from the mongo shell

Question

I'm using mongodb 2.4.4 and I want to compare 2 documents, then print their differences only using the mongo shell. Is there a way to compare them? Something like:

db.collection.compare({first_doc: objectID("blablalba"), sec_doc: objectID("blalba2")})

and the output would be something like

{diff1:{latitude:{first_doc:10.000, sec_doc:20.000}},diff2:{}}

where latitude is the name of the field that had a difference.

The output doesn't need to be exactly like that, but give the same functionality. Thanks

Answer 1

Just declare native javascript function that can compare two objects in a way you need, then write a code like this:

obj1 = db.test.findOne({"_id" : ObjectId("5176f80981f1e2878e840888")})
obj2 = db.test.findOne({"_id" : ObjectId("5176f82081f1e2878e840889")})
difference(obj1, obj2)

Some native javascript difference functions can be found here or here

P.S. You can also load some third party js libs from shell like this:

load("D:\difference.js")

Hope this help.