PageInterface swap

[Leden]

trafficstars

This gives users the ability to swap the implementation of PageInterface.

An example use-case is to override the resolvers for the fields, for example, to allow API access to private pages based on current user's permissions, etc.

Usage:

# settings.py
GRAPPLE_PAGE_INTERFACE = "myproject.myapp.interfaces.MyPageInterface"

If not set, uses the default implementation

# myproject/myapp/interfaces.py
from grapple.types.pages import PageInterface

class MyPageInterface(PageInterface):
    def resolve_children(self, into, **kwargs):
        # alternative implementation of the `children` field resolver
        return ...

[zerolab]

Thank you for this @Leden. Could you please add some documentation and a couple of tests?

[dopry]

@Leden I wanted to check in and see if you had any time or interest in finishing up this PR?

[dopry]

@zerolab how do we want to proceed on this PR? @Leden doesn't appear to be responding. Do you think this is a valuable enough feature for one of us to take over or should we just close it as stale?

[zerolab]

Considering that a project that does not use Grapple can implement any custom interface, this can be a valuable enough addition to allow folk to customise things.

[dopry]

superceded by: #325