Added MethodViewResolver

[smn-snkl]

This PR proposes a solution for #359

By subclassing RestyResolver and modifying its resolve_function_from_operation_id method, it is now possible to use automatic routing functionality with Flask's MethodView together with MethodViewResolver.

Changes proposed in this pull request:

• modified resolve_function_from_operation_id to return Flask's MethodView functions

[dtkav]

Thanks @smn-snkl !

I think the next steps are:

1. add tests
2. update docs
3. add an example

Do you have bandwidth to take that on?

[Bengreen]

can I suggest a change on line 163

cls_path = "{}.{}View".format(module, path.title() if path.islower() else path)

[smn-snkl]

@Bengreen can you explain the reasoning behind this? The reason I'm asking this is that I changed the implementation yesterday (and just committed it) to work with camelCase resources and still support the standard operationId keys for manual routing

[smn-snkl]

@dtkav Don't have the resources right now. May be able to do it in a few days. If anyone else wants to take it on, I'd be happy as well

[Bengreen]

I am trying out some examples of how I use MethodView in past against this Resolver and trying to work out suggestions to allow it to work across standard ways of using MethodView.
Will try to post some examples based on pet store.

[smn-snkl]

@Bengreen cool, thanks! Make sure to check the latest commit as I fixed some use cases as well

[Bengreen]

@smn-snkl I made a PR to your patch to add an example for MethodViewResolver.
Let me know if it works for you?

[smn-snkl]

Just merged @Bengreen 's example into this PR. Thanks!

[Bengreen]

I just made a PR for @smn-snkl patch to add tests.
Tests are a mirror of RestyResolver.

[smn-snkl]

Thanks @Bengreen. Just merged your tests into this PR as well. Have to admit though I didn't carefully review this last merge

[smn-snkl]

@Bengreen : CI fails for latest Python version. Do you mind fixing the issue? I invited you to my fork. I think it's just the order of the imports.

[Bengreen]

PR for this Merge with @smn-snkl to correct isort issues and correct example

[Bengreen]

Can we get a review from @dtkav

[Bengreen]

Code has been cleaned up, examples added and tests added. It follows similar concept to RestyResolver.

[dtkav]

Please update the docs here: https://github.com/zalando/connexion/blob/master/docs/routing.rst
Otherwise this is looking great. Nice work!

[Bengreen]

@dtkav Docs added.

[dtkav]

Awesome, thank you!

[Bengreen]

I made a merge of most recent master to this branch

[jmcs]

👍