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mix_types.py
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mix_types.py
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""" Mixer types. """
from copy import deepcopy
class BigInteger:
""" Type for big integers. """
pass
class EmailString:
""" Type for emails. """
pass
class HostnameString:
""" Type for hostnames. """
pass
class IP4String:
""" Type for IPv4 addresses. """
pass
class IP6String:
""" Type for IPv6 addresses. """
pass
class IPString:
""" Type for IPv4 and IPv6 addresses. """
pass
class NullOrBoolean:
""" Type for None or boolean values. """
pass
class PositiveDecimal:
""" Type for positive decimals. """
pass
class PositiveInteger:
""" Type for positive integers. """
pass
class PositiveSmallInteger:
""" Type for positive small integers. """
pass
class SmallInteger:
""" Type for small integers. """
pass
class Text:
""" Type for texts. """
pass
class URL:
""" Type for URLs. """
pass
class UUID:
""" Type for UUIDs. """
pass
class Mix(object):
""" Virtual link on the mixed object.
::
mixer = Mixer()
# here `mixer.MIX` points on a generated `User` instance
user = mixer.blend(User, username=mixer.MIX.first_name)
# here `mixer.MIX` points on a generated `Message.author` instance
message = mixer.blend(Message, author__name=mixer.MIX.login)
# Mixer mix can get a function
message = mixer.blend(Message, title=mixer.MIX.author(
lambda author: 'Author: %s' % author.name
))
"""
def __init__(self, value=None, parent=None):
self.__value = value
self.__parent = parent
self.__func = None
def __getattr__(self, value):
return Mix(value, self if self.__value else None)
def __call__(self, func):
self.__func = func
return self
def __and__(self, values):
if self.__parent:
values = self.__parent & values
if isinstance(values, dict):
value = values[self.__value]
elif isinstance(values, _Deffered):
value = getattr(values.value, self.__value)
else:
value = getattr(values, self.__value)
if self.__func:
return self.__func(value)
return value
def __str__(self):
return '%s/%s' % (self.__value, str(self.__parent or ''))
def __repr__(self):
return '<Mix %s>' % str(self)
class ServiceValue(object):
""" Abstract class for mixer values. """
def __init__(self, scheme=None, *choices, **params):
self.scheme = scheme
self.choices = choices
self.params = params
@classmethod
def __call__(cls, *args, **kwargs):
return cls(*args, **kwargs)
def gen_value(self, type_mixer, name, field):
""" Abstract method for value generation. """
raise NotImplementedError
class Field(ServiceValue):
""" Set field values.
By default the mixer generates random or fake a field values by types
of them. But you can set some values by manual.
::
# Generate a User model
mixer.blend(User)
# Generate with some values
mixer.blend(User, name='John Connor')
.. note:: Value may be a callable or instance of generator.
::
# Value may be callable
client = mixer.blend(Client, username=lambda:'callable_value')
assert client.username == 'callable_value'
# Value may be a generator
clients = mixer.cycle(4).blend(
Client, username=(name for name in ('Piter', 'John')))
.. seealso:: :class:`mixer.main.Fake`, :class:`mixer.main.Random`,
:class:`mixer.main.Select`,
:meth:`mixer.main.Mixer.sequence`
"""
def __init__(self, scheme, name, **params):
self.name = name
super(Field, self).__init__(scheme, **params)
def __deepcopy__(self, memo):
return Field(self.scheme, self.name, **deepcopy(self.params))
def gen_value(self, type_mixer, name, field):
""" Call :meth:`TypeMixer.gen_field`.
:return value: A generated value
"""
return type_mixer.gen_field(field)
# Service classes
class Fake(ServiceValue):
""" Force a `fake` value.
If you initialized a :class:`~mixer.main.Mixer` with `fake=False` you can
force a `fake` value for field with this attribute (mixer.FAKE).
::
mixer = Mixer(fake=False)
user = mixer.blend(User)
print user.name # Some like: Fdjw4das
user = mixer.blend(User, name=mixer.FAKE)
print user.name # Some like: Bob Marley
You can setup a field type for generation of fake value: ::
user = mixer.blend(User, score=mixer.FAKE(str))
print user.score # Some like: Bob Marley
.. note:: This is also usefull on ORM model generation for filling a fields
with default values (or null).
::
from mixer.backend.django import mixer
user = mixer.blend('auth.User', first_name=mixer.FAKE)
print user.first_name # Some like: John
"""
def gen_value(self, type_mixer, name, fake):
""" Call :meth:`TypeMixer.gen_fake`.
:return value: A generated value
"""
return type_mixer.gen_fake(name, fake)
class Random(ServiceValue):
""" Force a `random` value.
If you initialized a :class:`~mixer.main.Mixer` by default mixer try to
fill fields with `fake` data. You can user `mixer.RANDOM` for prevent this
behaviour for a custom fields.
::
mixer = Mixer()
user = mixer.blend(User)
print user.name # Some like: Bob Marley
user = mixer.blend(User, name=mixer.RANDOM)
print user.name # Some like: Fdjw4das
You can setup a field type for generation of fake value: ::
user = mixer.blend(User, score=mixer.RANDOM(str))
print user.score # Some like: Fdjw4das
Or you can get random value from choices: ::
user = mixer.blend(User, name=mixer.RANDOM('john', 'mike'))
print user.name # mike or john
.. note:: This is also usefull on ORM model generation for randomize fields
with default values (or null).
::
from mixer.backend.django import mixer
mixer.blend('auth.User', first_name=mixer.RANDOM)
print user.first_name # Some like: Fdjw4das
"""
def __init__(self, scheme=None, *choices, **params):
super(Random, self).__init__(scheme, *choices, **params)
if scheme is not None:
self.choices += scheme,
def gen_value(self, type_mixer, name, random):
""" Call :meth:`TypeMixer.gen_random`.
:return value: A generated value
"""
return type_mixer.gen_random(name, random)
class Select(Random):
""" Select values from database.
When you generate some ORM models you can set value for related fields
from database (select by random).
Example for Django (select user from exists): ::
from mixer.backend.django import mixer
mixer.generate(Role, user=mixer.SELECT)
You can setup a Django or SQLAlchemy filters with `mixer.SELECT`: ::
from mixer.backend.django import mixer
mixer.generate(Role, user=mixer.SELECT(
username='test'
))
"""
def gen_value(self, type_mixer, name, field):
""" Call :meth:`TypeMixer.gen_random`.
:return value: A generated value
"""
return type_mixer.gen_select(name, field)
class _Deffered(object):
""" A type which will be generated later. """
def __init__(self, value, scheme=None):
self.value = value
self.scheme = scheme