Support List without @MappedCollection(keyColumn=) [DATAJDBC-630]

[spring-projects-issues]

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Veli-Pekka Muli opened DATAJDBC-630 and commented

Currently the only way to have collections that don't have an order column in the database is to make the collection a Set. This is limiting as Set does not allow duplicate elements and Spring Data JDBC shouldn't force the type of the collections that the entities can have like this. If I want to sort the collection in my code then it might be confusing for the reader because I was forced to use Set which usually isn't ordered. @MappedCollection should be optional for Lists

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No further details from DATAJDBC-630

[spring-projects-issues]

Jens Schauder commented

I agree in principle, but it shouldn't be represented by a List but a separate datatype. Hibernate calls it a Bag

[spring-projects-issues]

Veli-Pekka Muli commented

Doesn't Hibernate Bag map to List? Having some non-standard data type would add Spring Data JDBC as a dependency of my entities

[spring-projects-issues]

Jens Schauder commented

Very good point

[spring-projects-issues]

Jens Schauder commented

After some internal discussion we decided that Collection would be a good way to mark a collection has not specifying an order but potentially having multiple identical entries