Full CRUD would be nice

[abonhote]

Currently, we can only insert new books - we can't edit them, nor delete them.

[changchengqin]

Yes. Looking forward to a complete CRUD example with multiple object relationships.

In actual projects, there are still many principles that need to be followed, such as:

1. Avoid establishing bidirectional relationships between models
2. The official manual document provides several best practices, one of which is:
   Use Immutable data models.
   Because it can improve performance. However, if you want to update these Immutable data models, other objects that reference them need to be manually synchronized and stored.

I hope the project team can share more practical experience and skills, including modeling, modification, synchronization, updating, etc.

thks.
@mstahv @mbarbero @netomi