MongoDB - count is deprecated

Question

I'm making a MongoDB query where i both need to loop through my results and count the len of the result to see if i'm being returned an empty result.

Here is what i tried:

Record = db.mycol.find({"datetimeraw": dt.now().strftime('%Y%m%d%H%M')})

RecordLen = Record.count()
print('LEN IS':RecordLen)

for x in Record:
    print(x)

This code works, but when i use it i get the following error: DeprecationWarning: count is deprecated. Use Collection.count_documents instead. The problem is that i cannot use count_documents(), since it will return an integer and not a list of results that i can loop through; i would have to make two queries in this case: one to count and one to retrieve the results, and i would like to avoid that. Is there any way to do this or can i only use a depecrated function?

Answer 1

In MongoDB .find() will always return a cursor, which can either be empty [] or an array of documents/dicts [{},{}].

As .count() can be used in three ways :

/** 1. Queries all docs based on filter and then returns no.of docs matches with query */
db.collection.find( { queryFilter } ).count()

/** 2. Returns no.of docs */
db.collection.count()

/** 3. Returns a cursor `results` */ 
results = db.collection.find( { queryFilter } )
results.count()

So first two options are similar to countdocuments() and estimateddocumentcount() (returns a number) but as you wanted to return the documents and also get the count on cursor similar to cursor.count() then you can do it in code by using len() method : len(list(results)).