declarative de/serialization of python structures
Project description
As a result of frustration working with colander, I decided to create something similar…
Objective is a de/serialization tool with following features:
declarative definition of objectives.
no confusion about how to define something, it is always the same.
reuse definitions by inheritance.
optional validation.
make it simple to override certain parts.
Usage
Simple mapping and validation
import objective
import datetime
now = datetime.datetime(2001, 9, 11)
class UserObjective(objective.Mapping):
name = objective.Item(objective.Unicode, missing=objective.Ignore)
email = objective.Item(objective.Unicode, validator=objective.Email())
password = objective.Item(objective.Unicode)
since = objective.Item(objective.UtcDateTime, missing=now)
serialized = {
'email': 'foo@example.com',
'password': 'foobar'
}
deserialized = UserObjective.deserialize(serialized)
assert deserialized == {
'password': u'foobar',
'email': u'foo@example.com',
'since': datetime.datetime(2001, 9, 11, 0, 0)
}
bad_serialized = {
'name': 'foobar'
}
try:
deserialized = UserObjective().deserialize(bad_serialized)
except objective.Invalid as e:
assert isinstance(e, objective.exc.InvalidChildren)
assert {(x.node.__name__, x.__class__, x.value) for x in e.children} == {
('password', objective.exc.MissingValue, objective.values.Undefined),
('email', objective.exc.InvalidValue, 'baz')
}Mapping complex structures
import objective
class ProductRequestObjective(objective.BunchMapping):
@objective.Item()
class body(objective.Mapping):
name = objective.Item(objective.Unicode)
root = objective.Item(objective.Unicode)
@objective.Item()
class semantics(objective.List):
items = objective.Item(objective.Unicode)
@objective.Item()
class match(objective.Mapping):
_id = objective.Item(objective.Field)Issues, thoughts, ideas
objective is far from complete. There are tons of possible validators I can imagine.
I tried my best (mostly in terms of time) to test.
If you find bugs or you have a great idea, I am totally open to implement it.
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