Custom fields for marshmallow plugin

[prokaktus]

Hello!

I've spend some time and cannot figure out, how to register custom fields for apispec through aiohttp-apispec library.

Docs about this at apispec:
https://apispec.readthedocs.io/en/latest/using_plugins.html#custom-fields

But MarshmallowPlugin created inside AiohttpApiSpec and not exposed explicitly.

What do you think about instantiating MarshmallowPlugin at module level or put into global context? It will allows me to import this plugin and decorate my own custom fields.

Thanks for your attention!

[prokaktus]

@maximdanilchenko what do you think about this? Should I prepare PR for this case?

[maximdanilchenko]

@prokaktus, hi!

Yes, I think that instantiating MarshmallowPlugin at module level is a good idea.
You can make a PR, it would be great.

[muffinmad]

Hi! Any progress on this?