How to exact match entire document?

Question

Exact matching subdocuments is easy, but is there a way to exact match entire document in a collection ?

I have a lot of documents with similar data, and I only need e

Answer 1

i don't think this is possible outright, but a possible solution is to hash the document.

when saving, always create a hash of the document:

var doc = {};
delete doc.hash; // never include the hash itself in the calculation
doc.hash = crypto.createHash('sha256').update(JSON.stringify(doc)).digest();
db.collection.insert(doc);

Then when querying, you can query by hash:

db.collection.find({
  hash: hash
})

might be annoying if you frequently do atomic updates on the document.