Key name overrides for Python keywords.

[imaurer]

Objects cannot have a keyword for a field name. For instance, this is invalid:

@related.immutable
class MyModel(object):
    for = related.StringField()   # invalid !
    not = related.BooleanField()  # invalid too !

But sometimes, you need to be able to convert to and from JSON formats that contain those keywords as keys:

{ "for": "Elise", "not": true }

To handle these situations, this fix will allow for overriding the name in the to/from dictionary methods.

@related.immutable
class MyModel(object):
    is_for = related.StringField(key="for")
    is_not = related.BooleanField(key="not")

obj = related.to_model(MyModel, { "for": "Elise", "not": True })
assert obj.is_for == "Elise"
assert obj.is_not is True

[imaurer]

Fixed here:

https://github.com/genomoncology/related/blob/master/tests/ex05_field_names/test_renamed.py