Allow OPENAPI_URL_PREFIX to be '/'

[fbergroth]

If OPENAPI_URL_PREFIX == '/', _add_leading_slash is being called with an empty string and crashes with an IndexError.

[coveralls]

Coverage remained the same at 99.622% when pulling f498159 on fbergroth:fix-prefix into 2f0544a on Nobatek:master.

[lafrech]

Nice catch.

I didn't think of putting the docs at the root of the application, but thinking of it, I find it better and I might do the same in my apps in the future. If OPENAPI_REDOC_PATH is also / (or ''), the landing page of the app will be the documentation page, which is nice.

I did a few more modifications in bfcda78 to allow this.

Thanks for the suggestion.

[fbergroth]

@lafrech alright, cool. I'm just started out with this library, so I'll be blunt and hijack this PR to ask a question. Is there any simple way to make a mixed type? I'm trying to make a custom field that renders this type:

oneOf:
  - type: string
  - type: array
    items:
      type: string

[lafrech]

You can bake a custom marshmallow field that would do that.

Regarding the documentation, I don't know. Polymorphism is still a complicated thing: marshmallow-code/apispec#182.

I think if we implemented the FIELD_TO_PROPERTY mapping I'm suggesting in marshmallow-code/apispec#172 (comment), you could have a workaround. Maybe a bit too manual, but better than nothing.

[fbergroth]

Thanks for linking these issues.

I think if we implemented the FIELD_TO_PROPERTY mapping I'm suggesting in marshmallow-code/apispec#172 (comment), you could have a workaround. Maybe a bit too manual, but better than nothing.

I think ret.update may not be enough. For my use-case, I would need to also remove some keys (type) of ret. I guess I'll have to resort to monkey patching for now.