Expose failed property name in required_draft4?

[pobiega]

https://github.com/Julian/jsonschema/blob/master/jsonschema/_validators.py#L314

It would be very useful to expose the property that failed, other than in the message. Adding a ValidationError.property property that defaults to None and filling it before yielding works and is what I'm currently doing locally.

[Julian]

Hi!

See #119, which is still waiting for a patch :)

[pampas93]

You could add the "required" field into your schema; and once you validate; you know which properties are missing.
Worked for me.