[feature] create if not exist for Update APIs

[nonchan7720]

[feature] create if not exist for Update APIs

[casbin-bot]

@tangyang9464 @JalinWang

[casbin-bot]

@tangyang9464 @JalinWang @imp2002

[nonchan7720]

Sorry.
I made a mistake in the content.

What I meant to say is that I would like to see a feature like Replace.

As an example of use, we would like to filter Policy and Grouping to perform a search, delete existing rules if they exist, and create new rules as given.

[hsluoyz]

@nonchan7720 what you said is how Update APIs work now? If exist, then update. If not exist, then error (and not update). Isn't this what you want?

[nonchan7720]

@hsluoyz
My hope is that existing rules will be created and propagated to watchers and others even if they do not exist.

Expect line 445 to be skipped.
https://github.com/casbin/casbin/blob/540b521da0f969ed8f1b348c6fb34edc0e668a86/internal_api.go#L443-L447

[hsluoyz]

@nonchan7720 this requirement is very rare. You can fork the code and use your own fork