Look at schematics

[mjtamlyn]

https://github.com/schematics/schematics

http://schematics.readthedocs.io/en/latest/index.html

Looks like this gets a lot of things right that we're looking at. The API is nice, the to_primitive is a pretty good naming convention, and the validation/coercion/conversion logic seems clean. It lacks introspectability and good complex validation support as far as I can see, but it's pretty good!

[LilyFoote]

The roles seem pretty shiny - I don't think I've seen that sort of idea with such a clean api before.

[jpic]

Awesome, I think it would be great to reuse it in this lib, if it fits our needs: reinventing it would seem like a waste of human resources

[jpic]

Based on their getting started, SchematicsAdapters could be usable like:

import datetime
from schematics.models import Model
from schematics.types import StringType, DecimalType, DateTimeType

class WeatherReport(Model):
    city = StringType()
    temperature = DecimalType()
    taken_at = DateTimeType(default=datetime.datetime.now)

a = SchematicsAdapter(model=WeatherReport)
a = a.steps.clean(data={'city': 'NYC', 'temperature': 80})
assert a.instance.temperature == Decimal('80.0')

But that we could also do:

a = DjangoSchematicsAdapter(
   pk=3, # DjangoModel.instanciate step will use this to set self.instance
   adapters=[WeatherDjangoModelAdapter, SchematicsAdapter(WeatherModel)],
).steps.clean(data={'city': 'NYC', 'temperature': 80})
if not a.errors:
    a = a.steps.process()