[英]How to query MongoDB and group result by month using Pymongo?
I've written the following code which correctly lists my address collection by month number with a count but these are the totals and I need to effectively add a condition which only returns results where "type = green". 我已经编写了以下代码,该代码正确地按月份编号列出了我的地址集合并带有计数,但这些是总数,因此我需要有效地添加一个条件,该条件只能返回“类型=绿色”的结果。 I can't work out how to only count when it matches these criteria.
我无法解决如何仅在符合这些条件时进行计数。
result = db.address.aggregate([{"$group":{"_id": { "$month": "$date" },
"count":{"$sum":1} } } ])
list_of_months = ["nothing", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
result_sorted = sorted(result, key=lambda x: x['_id'], reverse=False)
for res in result_sorted:
print(list_of_months[res['_id']], ": ", res['count'])
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