mongoengine unique
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 ... ,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 ... ,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', ... ,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 ... ,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( ... ,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. ,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 ... ,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 ... ,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 ...
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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 |