Add information about model validation vs form validation

[mschoettle]

Location within the Book

• Chapter or Appendix: n/a
• Section: n/a
• Subsection: n/a

Description

I was wondering about where to put validation across multiple fields for a model. Either Model.clean() or within the form (as is described in the book). I could not find any mention of Model.clean() (unless my search is broken).

Naturally I would have placed it in the model in order to benefit everywhere from this validation but according to the book it seems to be placed usually in the ModelForm.

Possible Solutions

I think the book would benefit from at least a paragraph describing what the best practice would be of where to put it.
See also: https://stackoverflow.com/questions/20017742/when-to-use-form-vs-model-validation

Your full name so we can provide accurate credit within the book

Matthias Schoettle