DomainModel Views

[rmk135]

The idea is to create easy way for specification of custom model views. Model views here are an algorithms that define how model's data should look like.

Case:

• We have domain model of user's profile - Profile. Profile model has "public" and "private" views. "Public view" of Profile model is a set of data that could be shown to any other user without any restrictions, it contains less data then Profile model (doesn't contain private data). At the same time "Private view" of Profile model is a full set of Profile model data (may be even with some extra information).

from domain_models import models
from domain_models import fields
from domain_models import views

class Profile(models.DomainModel):

    id = fields.Int()
    name = fields.String()
    birth_date = fields.Date()
    business_address = fields.String()
    home_address = fields.String()

    public_view = views.View(include=[name, business_address])
    private_view = views.View(include=[name, birth_date, business_address, home_address])

profile = Profile(id=1, 
                  name='John', 
                  birth_date=datetime.date(1950, 4, 18), 
                  business_address='John works here', 
                  home_address='John lives here')

assert profile.public_view() == {
    'name': 'John',
    'business_address': 'John works here'
}
assert profile.private_view() == {
    'name': 'John',
    'birth_date': datetime.date(1950, 4, 18),
    'business_address': 'John works here',
    'home_address': 'John lives here'
}

Notes:

• views.View should have two arguments - include and exclude, that are sequences (list, tuple, set, etc...) of model fields.
• views.View arguments include and exclude could not be specified simultaneously.

[boonya]

Seems like it is pretty similar to #25