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Description:

kanagata 0.0.1

Providing extracted dict (subclass of collections.UserDict).

how to use
(todo: description)
models.py
from kanagata import RestrictionBuilder

# group: name, users
# user: name, age, Option[skills], Option[school]
# skill: name
with RestrictionBuilder() as b:
with b.define_dict("Group") as group:
group.add_member("name", required=True)
group.add_list("users", "User", required=True)

with b.define_dict("User") as user:
user.add_member("name", required=True)
user.add_member("age", required=True)
user.add_dict("school", "School", required=False)
user.add_list("skills", "Skill", required=False)

with b.define_dict("Skill") as skill:
skill.add_member("name", required=True)

with b.define_dict("School") as school:
school.add_member("name")
school.add_list("groups", "Group", required=True)
from models import User

# user can have only name, age, skills. (skills is optional)

user = User(name="foo", age=20, skills=[])
print(user) # {'name': 'foo', 'age': 20, 'skills': []}

try:
user2 = User(name="bar")
# ValueError: User: required fields {'age'} are not found
except ValueError:
pass

try:
user["xxx"] = "bar"
# ValueError: User: unsupported field 'xxx', field members=['name', 'age', 'school', 'skills']
except ValueError:
pass

# user.skills can have only name.

user["skills"].append({"name": "math"})
print(user) # {'skills': [{'name': 'math'}], 'age': 20, 'name': 'foo'}

try:
user["skills"].append({})
# ValueError: Skill: required fields {'name'} are not found
except ValueError:
pass
0.0.1

default option support