ddd-by-examples / ddd-by-examples/library
Question about DB schema
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Description
Hi,
I am new to DDD and I am finding this repo very helpful. Just curious about the way one to many relationship between book and patron is handled in DB in lending module.
BookOnHold (book_database_entity) entity has byPatron and holdPlacedAt which is a standard way of doing one to many relationship but there is also a PatronHolds (holds_database_entity) entity which pretty much has the same information. Can someone please explain what kind of pattern this is ? Isn't this just duplicating data in DB ?
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Research direction
Start by reading the BookOnHold (book_database_entity) and PatronHolds (holds_database_entity) entities in the lending module, then trace how the book–patron hold relationship is represented. Done means documenting the pattern and explaining whether the repeated information is intentional.
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Assessment
- Tech stack
- java
- Domain
- databases
- Issue type
- Documentation
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100