I actually ran into trouble from this recently, definitely something we should fix.

This turns out to be kind of a pain because of how biolink pydantic dataclasses work.

One option we considered was running a check in the writer at each row:

if not set(record.keys()).issubset(self.node_properties):
    missing = set(record.keys()).difference(self.node_properties)
    raise ValueError("Node properties missing from config: " + ", ".join(missing))

...
if not set(record.keys()).issubset(self.edge_properties):
    missing = set(record.keys()).difference(self.edge_properties)
    raise ValueError("Edge properties missing from config: " + ", ".join(missing))

but this may be very not performant. It may also just not work, because biolink dataclasses are instantiated with all attributes set, whether to None or a value

I decided to abstract a bit of the functionality up the abstract KozaWriter class to add this functionality at a higher level. I kind of like what I've done but it may not be the best approach. Please take a look at what I've done at #154