[SUGGESTION] Save/Load Hooks

[JKamsker]

Is your feature request related to a problem? Please describe. In my library (LiteDB.Migration) i support "Implicit migrations" which automatically migrates a document at load time and adds a __version field on save (Here)

Currently it is very hacky and not really stable (The order of mapping registrations must be correct.)

Describe the solution you'd like One of two things:

• Implement and accept IBsonMapper: This way, i could use a wrapper which only holds my "Versionable" registrations
• Load/Save hooks that get called when a document is loaded/saved (must be r/w)

Describe alternatives you've considered See https://github.com/JKamsker/LiteDB.Migration/blob/master/LiteDb.Migration/MigrationRegistry.cs#L297

[mbdavid]

Olá @JKamsker,

How cool is your lib for versioning. I always thought about using versioning using fixed code structures and that's why from the beginning I have the USER_VERSION field to track the versions. Regarding your lib, the BsonMapper class I created thinking about being overwritten with changes to these rules (that's why there are some protected methods there). I will check if there is any impact on creating this interface and adjust it soon.

[JKamsker]

Uh, Thanks 😅 I am trying to create something nice 😀 Didn't know about USER_VERSION but i could incorperate it into my project 👍 Although i am not quite sure, because the lib works on a document/collection level.

Thanks for considering to alter your BsonMapper for me!