What's the best way to validate data in both controllers and models, before creating/reading/updating/deleting this data

[eluser]jellysandwich[/eluser]
[quote author="porquero" date="1329827144"]You shoul use CI validation way, so you can validate in controller and model:


http://ellislab.com/codeigniter/user-gui...ation.html[/quote]

^Agreed, you should be using CI's validation library.

If you want to keep it simple, you can put all the validation in the model.

For callback validations, you can use this:

http://ellislab.com/forums/viewthread/205469/