通过使用PyMongo进行迭代时，如何在集合中找到值的名称（键）？

Question

When using a cursor to iterate through a collection like so,

import pymongo
cursor = pymongo.Connection().test_db.test_collection.find()
for item in cursor:
    print item
    #this will print the item as a dictionary

only the values are returned. I'm looking for a way to access the name of the value.

I have found a similar method called getCollectionNames() however it is used to return every collection name in the database.

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Quick [Hacky] Fix: Store the name of the collection inside the collection itself and simple call the name from the value returned by the cursor using item.name

Answer 1

If I understand correctly, you are looking for a way to get the collection name you are working on or that you have queried; If that is the case here is how you do it: user collection.name

import pymongo
cursor = pymongo.Connection().test_db.test_collection.find()
print cursor.collection.name
for item in cursor:
    print item
    #this will print the item as a dictionary

If you mean to retrieve the keys inside of the collection itself. You can simply add an extra loop and retrieve the keys for each document in cursor. example:

import pymongo
cursor = pymongo.Connection().test_db.test_collection.find()
print cursor.collection.name
for item in cursor:
    for key in item:
        print key

Answer 2

You can iterate over the top level field names and their associated values using this snippet:

for fieldname, fieldvalue in item.iteritems():
   print (fieldname, fieldvalue )