Alternative design pattern for handlePOST etc methods

[nohponex]

Further discussion needed

Current design pattern makes it very complicated when implementing complex handlePOST or PATCH methods.

Since in real life world additional checks, transformations have to be made before executing, custom logs, notifications should be processed after and flags and messages to be passed between these two.

Current validationCallbacks and viewCallback is no fit for the job, since passing message requires passing variables by reference so the modified value can be passed to viewCallback

Proposals:

• a Perhaps a layered pattern like small middleware will be useful
• b Use context for callables An alternative approach might be to create an object context and transform callables to closures, so set context for them.

[nohponex]

https://github.com/phramework/jsonapi/issues/51

[nohponex]

Since it seems that most of the checks are reusable, a middleware solution seems ideal Of course a name conversion for compatibility should be used since a lot of attributes should be read and written in each layer