mongoengine unique
Retrieving unique results¶. To retrieve a result that should be unique in the collection, use get() . This will raise DoesNotExist if no document matches the query, ... ,Return a list of distinct values for a given field. Parameters. field – the field to select distinct values from. Note. This is a command and won't take ordering ...
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 mongoengine unique 相關參考資料
2.3. Defining documents — MongoEngine 0.22.1 documentation
unique (Default: False). When True, no documents in the collection will have the same value for this field. unique_with (Default: None). A field name (or list of ... https://docs.mongoengine.org 2.5. Querying the database — MongoEngine 0.22.1 ...
Retrieving unique results¶. To retrieve a result that should be unique in the collection, use get() . This will raise DoesNotExist if no document matches the query, ... https://docs.mongoengine.org 3. API Reference — MongoEngine 0.22.1 documentation
Return a list of distinct values for a given field. Parameters. field – the field to select distinct values from. Note. This is a command and won't take ordering ... https://docs.mongoengine.org how to create an index in mongoengine to be unique=True ...
2013年3月25日 — You will have to declare the index in the meta definition eg: class BlogPost(Document): date = DateTimeField(db_field='addDate', ... https://stackoverflow.com How to make a combined set of fields unique in Mongodb in ...
2017年1月27日 — How to make a combined set of fields unique in Mongodb in Python · python mongodb mongoengine. I want to create a table where two of its ... https://stackoverflow.com How to query for distinct results in mongodb with python ...
2013年11月15日 — Mongoengine's QuerySet class does support distinct() method to do the job. So you might try something like this to get results: Students.objects( ... https://stackoverflow.com Manage field with unique=true and required=false · Issue ...
2017年7月7日 — In any database management system, there is only one null value permitted when you set unique constraint. It is nothing about mongoengine. https://github.com MongoDB, MongoEngine: unique list items - Stack Overflow
The best way to deal with this is to use MongoDB's native features. There are two operators that you could use: 1) Using $nin query out any votes that I have ... https://stackoverflow.com mongoengine unique constraing - Stack Overflow
2014年7月2日 — You may not have a unique index defined in your Document model. But at some point in time a unique index was created for "name". So you ... https://stackoverflow.com Mongoengine unique_with - Stack Overflow
2015年10月21日 — If you want to modify an existing index's parameters, you have to drop the index first and then recreate it. Of course you cannot create a unique ... https://stackoverflow.com |