Query tangled array in Pymongo

问题

I am trying to query a very tangled collection.

The schema:

{'tags': {'variables': [{'value': '3x9', 'var_name': 's'},
                     {'value': '12:00AM', 'var_name': 'x'},
                     {'value': 'goog', 'var_name': 'y'}]},
                     'url': 'https://www.google.com'}]

The Query:

res = mycol.aggregate([{"$unwind":"$tags"}
     ,{'$match': {'tags.tag.name':'A A', 'aR': 98765}}
     ,{'$project': {'url': 1, 'tags.vars': 1, '_id': 0}},])


res = list(res)
for x in res: 
    print(res)

The Result:

{'tags': {'variables': [{'value': '3x9', 'var_name': 's'},
                     {'value': '12:00AM', 'var_name': 'x'},
                     {'value': 'goog', 'var_name': 'y'}]},
                     'url': 'https://www.google.com'}]

The Expected Result:

[{'value': '3x9', 'var_name': 's'},
{'value': '12:00AM', 'var_name': 'x'},
{'value': 'goog', 'var_name': 'y'},
'url': 'https://www.google.com']

I will use it as a HttpResponse and use it as a JSON object.

Please Help!

回答1:

Can you just say res['tags']['variables'] instead of res = list(res)?

来源：https://stackoverflow.com/questions/52829141/query-tangled-array-in-pymongo