marshmallow first usage.

marshmallow-demo-1.py

from collections import namedtuple
import datetime
import arrow
from marshmallow import Schema
from marshmallow import fields, post_load

class CustomField(fields.Field):
    def _serialize(self, value, attr, obj):
        print "_serialize", value, attr, obj
        print 'context', self.context
        if value is None:
            return None
        return value

    def _deserialize(self, value, attr, data):
        print "_deserialize", value, attr, data
        print 'context', self.context
        return value


class UserSchema(Schema):
    name = fields.Str()
    email = fields.Email()
    foo = CustomField()



user_data = {
    'name': 'Ronnie',
    'email': '[email protected]',
    'foo': 'oops'
}

#schema.context['request'] = request

schema = UserSchema()
schema.context['oops'] = 'oops'
income = schema.load(user_data)
outcome= schema.dump(income.data)  # => <User(name='Ronnie')>

#print dir(outcome)
print outcome.data

#print dir(outcome)
print outcome.data

#print type(income), income
#print type(outcome), outcome

marshmallow-demo-2.py

import datetime as dt
from marshmallow import Schema, fields, post_load
#from marshmallow import pprint
from pprint import pprint

class User(object):
    def __init__(self, name, email,created_at=None):
        self.name = name
        self.email = email
        if created_at:
            self.created_at = created_at
        else:
            self.created_at = dt.datetime.now()

    def __repr__(self):
        return '<User(name={self.name!r})>'.format(self=self)


class UserSchema(Schema):
    name = fields.Str()
    email = fields.Email()
    created_at = fields.DateTime()

    @post_load
    def make_user(self, data):
        return User(**data)
        #print data
        #return data


user = User(name="Monty", email="[email protected]")
schema = UserSchema()
result = schema.dump(user)  # to dict
pprint(result.data)
result = schema.dumps(user) # to json string
pprint(result.data)


user_data = {
    'created_at': '2014-08-11T05:26:03.869245',
    'email': u'[email protected]',
    'name': u'Ken'
}


schema = UserSchema()
result = schema.load(user_data)
pprint(result.data)
pprint(type(result.data))