pymongo projection
2020年7月6日 — The projections are passed in the second argument of the find() method. projection.py. #!/usr/bin/python3 from pymongo import MongoClient ... ,A projection cannot contain both include and exclude specifications, with the exception of the _id field: In projections that explicitly include fields, the _id field is the ... ,A projection can explicitly include several fields by setting the <field> to 1 in the projection document. The following operation returns all documents that match the ... ,The $elemMatch projection operator takes an explicit condition argument. This allows you to project based on a condition not in the query, or if you need to ... ,2020年4月2日 — Is equeal to mongo shell , but the condition between "" db.foo.find("field1.field2":123},"field1":"$elemMatch":"field2":123}}}) ... ,2018年2月4日 — When using a projection you need to use either 1 or 0 and not True or False respectively. Try this: find( 'material_type':'solid' ... ,2018年8月10日 — query = '_id': upload_id } projection = 'files': '$elemMatch': 'original_filename': original_filename } } } result = list(self.uploads.find(query, ... ,2018年11月13日 — You can try converting the field list to a dict like this: coll.find(}, field: 1 for field in field_list}). ,2019年7月23日 — I believe that your issue is that your are using an aggregate function ( $toString ) without doing an aggregation. There are at least 2 options:.
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 pymongo projection 相關參考資料
PyMongo tutorial - Python MongoDB programming - ZetCode
2020年7月6日 — The projections are passed in the second argument of the find() method. projection.py. #!/usr/bin/python3 from pymongo import MongoClient ... http://zetcode.com db.collection.find() - MongoDB Documentation
A projection cannot contain both include and exclude specifications, with the exception of the _id field: In projections that explicitly include fields, the _id field is the ... https://docs.mongodb.com Project Fields to Return from Query — MongoDB Manual
A projection can explicitly include several fields by setting the <field> to 1 in the projection document. The following operation returns all documents that match the ... https://docs.mongodb.com $ (projection) — MongoDB Manual
The $elemMatch projection operator takes an explicit condition argument. This allows you to project based on a condition not in the query, or if you need to ... https://docs.mongodb.com PyMongo query with projection - Stack Overflow
2020年4月2日 — Is equeal to mongo shell , but the condition between "" db.foo.find("field1.field2":123},"field1":"$elemMatch":"field2":123}}}) ... ... https://stackoverflow.com Pymongo find with a projection operator - Stack Overflow
2018年2月4日 — When using a projection you need to use either 1 or 0 and not True or False respectively. Try this: find( 'material_type':'solid' ... https://stackoverflow.com How do I get projection $ to work in pymongo? - Stack Overflow
2018年8月10日 — query = '_id': upload_id } projection = 'files': '$elemMatch': 'original_filename': original_filename } } } result = list(self.uploads.find(query,&nbs... https://stackoverflow.com PyMongo: How to use a list as a projection in find() - Stack ...
2018年11月13日 — You can try converting the field list to a dict like this: coll.find(}, field: 1 for field in field_list}). https://stackoverflow.com Pymongo find() with "$toString" projection operator - Stack ...
2019年7月23日 — I believe that your issue is that your are using an aggregate function ( $toString ) without doing an aggregation. There are at least 2 options:. https://stackoverflow.com |