objective

declarative de/serialization of python structures

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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.

Project details

These details have not been verified by PyPI

Project links

Homepage

Release history Release notifications | RSS feed

0.0.13

Aug 9, 2018

0.0.12

Nov 2, 2017

0.0.11

Oct 20, 2017

0.0.10

Sep 29, 2016

0.0.9

Jul 18, 2016

This version

0.0.8

Mar 23, 2016

0.0.7

Mar 23, 2016

0.0.6

Mar 23, 2016

0.0.5

May 31, 2015

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