/usr/lib/python2.7/dist-packages/model_mommy/mommy.py is in python-model-mommy 1.5.1-1.
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from os.path import dirname, join
import django
from django.conf import settings
from django.contrib.contenttypes.models import ContentType
from django.apps import apps
get_model = apps.get_model
from django.contrib.contenttypes.fields import GenericRelation
from django.db.models.base import ModelBase
from django.db.models import ForeignKey, ManyToManyField, OneToOneField, Field, AutoField, BooleanField, FileField
if django.VERSION >= (1, 9):
from django.db.models.fields.related import ReverseManyToOneDescriptor as ForeignRelatedObjectsDescriptor
else:
from django.db.models.fields.related import ForeignRelatedObjectsDescriptor
from django.db.models.fields.proxy import OrderWrt
from . import generators
from . import random_gen
from .exceptions import (ModelNotFound, AmbiguousModelName, InvalidQuantityException, RecipeIteratorEmpty,
CustomMommyNotFound, InvalidCustomMommy)
from .utils import import_from_str, import_if_str
from six import string_types, advance_iterator, PY3
recipes = None
# FIXME: use pkg_resource
mock_file_jpeg = join(dirname(__file__), 'mock-img.jpeg')
mock_file_txt = join(dirname(__file__), 'mock_file.txt')
MAX_MANY_QUANTITY = 5
def _valid_quantity(quantity):
return quantity is not None and (not isinstance(quantity, int) or quantity < 1)
def make(_model, _quantity=None, make_m2m=False, _save_kwargs=None, _create_files=False, **attrs):
"""
Creates a persisted instance from a given model its associated models.
It fill the fields with random values or you can specify
which fields you want to define its values by yourself.
"""
_save_kwargs = _save_kwargs or {}
mommy = Mommy.create(_model, make_m2m=make_m2m, create_files=_create_files)
if _valid_quantity(_quantity):
raise InvalidQuantityException
if _quantity:
return [mommy.make(_save_kwargs=_save_kwargs, **attrs) for i in range(_quantity)]
else:
return mommy.make(_save_kwargs=_save_kwargs, **attrs)
def prepare(_model, _quantity=None, _save_related=False, **attrs):
"""
Creates BUT DOESN'T persist an instance from a given model its
associated models.
It fill the fields with random values or you can specify
which fields you want to define its values by yourself.
"""
mommy = Mommy.create(_model)
if _valid_quantity(_quantity):
raise InvalidQuantityException
if _quantity:
return [mommy.prepare(_save_related=_save_related, **attrs) for i in range(_quantity)]
else:
return mommy.prepare(_save_related=_save_related, **attrs)
def _recipe(name):
app, recipe_name = name.rsplit('.', 1)
return import_from_str('.'.join((app, 'mommy_recipes', recipe_name)))
def make_recipe(mommy_recipe_name, _quantity=None, **new_attrs):
return _recipe(mommy_recipe_name).make(_quantity=_quantity, **new_attrs)
def prepare_recipe(mommy_recipe_name, _quantity=None, _save_related=False, **new_attrs):
return _recipe(mommy_recipe_name).prepare(_quantity=_quantity, _save_related=_save_related, **new_attrs)
class ModelFinder(object):
'''
Encapsulates all the logic for finding a model to Mommy.
'''
_unique_models = None
_ambiguous_models = None
def get_model(self, name):
'''
Get a model.
:param name String on the form 'applabel.modelname' or 'modelname'.
:return a model class.
'''
try:
if '.' in name:
app_label, model_name = name.split('.')
model = get_model(app_label, model_name)
else:
model = self.get_model_by_name(name)
except LookupError:
model = None
if not model:
raise ModelNotFound("Could not find model '%s'." % name.title())
return model
def get_model_by_name(self, name):
'''
Get a model by name.
If a model with that name exists in more than one app,
raises AmbiguousModelName.
'''
name = name.lower()
if self._unique_models is None:
self._populate()
if name in self._ambiguous_models:
raise AmbiguousModelName('%s is a model in more than one app. '
'Use the form "app.model".' % name.title())
return self._unique_models.get(name)
def _populate(self):
'''
Cache models for faster self._get_model.
'''
unique_models = {}
ambiguous_models = []
all_models = apps.all_models
for app_model in all_models.values():
for name, model in app_model.items():
if name not in unique_models:
unique_models[name] = model
else:
ambiguous_models.append(name)
for name in ambiguous_models:
unique_models.pop(name, None)
self._ambiguous_models = ambiguous_models
self._unique_models = unique_models
def is_iterator(value):
if not hasattr(value, '__iter__'):
return False
if PY3:
return hasattr(value, '__next__')
else:
return hasattr(value, 'next')
def _custom_mommy_class():
"""
Returns custom mommy class specified by MOMMY_CUSTOM_CLASS in the django
settings, or None if no custom class is defined
"""
custom_class_string = getattr(settings, 'MOMMY_CUSTOM_CLASS', None)
if custom_class_string is None:
return None
try:
mommy_class = import_from_str(custom_class_string)
for required_function_name in ['make', 'prepare']:
if not hasattr(mommy_class, required_function_name):
raise InvalidCustomMommy('Custom Mommy classes must have a "%s" function' % required_function_name)
return mommy_class
except ImportError:
raise CustomMommyNotFound("Could not find custom mommy class '%s'" % custom_class_string)
class Mommy(object):
attr_mapping = {}
type_mapping = None
# Note: we're using one finder for all Mommy instances to avoid
# rebuilding the model cache for every make_* or prepare_* call.
finder = ModelFinder()
@classmethod
def create(cls, _model, make_m2m=False, create_files=False):
"""
Factory which creates the mommy class defined by the MOMMY_CUSTOM_CLASS setting
"""
mommy_class = _custom_mommy_class() or cls
return mommy_class(_model, make_m2m, create_files)
def __init__(self, _model, make_m2m=False, create_files=False):
self.make_m2m = make_m2m
self.create_files = create_files
self.m2m_dict = {}
self.iterator_attrs = {}
self.model_attrs = {}
self.rel_attrs = {}
self.rel_fields = []
if isinstance(_model, ModelBase):
self.model = _model
else:
self.model = self.finder.get_model(_model)
self.init_type_mapping()
def init_type_mapping(self):
self.type_mapping = generators.get_type_mapping()
generators_from_settings = getattr(settings, 'MOMMY_CUSTOM_FIELDS_GEN', {})
for k, v in generators_from_settings.items():
field_class = import_if_str(k)
generator = import_if_str(v)
self.type_mapping[field_class] = generator
def make(self, _save_kwargs=None, **attrs):
'''Creates and persists an instance of the model
associated with Mommy instance.'''
return self._make(commit=True, commit_related=True, _save_kwargs=_save_kwargs, **attrs)
def prepare(self, _save_related=False, **attrs):
'''Creates, but does not persist, an instance of the model
associated with Mommy instance.'''
return self._make(commit=False, commit_related=_save_related, **attrs)
def get_fields(self):
return self.model._meta.fields + self.model._meta.many_to_many
def get_related(self):
return [r for r in self.model._meta.related_objects if not r.many_to_many]
def _make(self, commit=True, commit_related=True, _save_kwargs=None, **attrs):
_save_kwargs = _save_kwargs or {}
self._clean_attrs(attrs)
for field in self.get_fields():
if self._skip_field(field):
continue
if isinstance(field, ManyToManyField):
if field.name not in self.model_attrs:
self.m2m_dict[field.name] = self.m2m_value(field)
else:
self.m2m_dict[field.name] = self.model_attrs.pop(field.name)
elif field.name not in self.model_attrs:
if not isinstance(field, ForeignKey) or '{0}_id'.format(field.name) not in self.model_attrs:
self.model_attrs[field.name] = self.generate_value(field, commit_related)
elif callable(self.model_attrs[field.name]):
self.model_attrs[field.name] = self.model_attrs[field.name]()
elif field.name in self.iterator_attrs:
try:
self.model_attrs[field.name] = advance_iterator(self.iterator_attrs[field.name])
except StopIteration:
raise RecipeIteratorEmpty('{0} iterator is empty.'.format(field.name))
instance = self.instance(self.model_attrs, _commit=commit, _save_kwargs=_save_kwargs)
if commit:
for related in self.get_related():
self.create_by_related_name(instance, related)
return instance
def m2m_value(self, field):
if field.name in self.rel_fields:
return self.generate_value(field)
if not self.make_m2m or field.null and not field.fill_optional:
return []
return self.generate_value(field)
def instance(self, attrs, _commit, _save_kwargs):
one_to_many_keys = {}
for k in tuple(attrs.keys()):
field = getattr(self.model, k, None)
if isinstance(field, ForeignRelatedObjectsDescriptor):
one_to_many_keys[k] = attrs.pop(k)
instance = self.model(**attrs)
# m2m only works for persisted instances
if _commit:
instance.save(**_save_kwargs)
self._handle_one_to_many(instance, one_to_many_keys)
self._handle_m2m(instance)
return instance
def create_by_related_name(self, instance, related):
rel_name = related.get_accessor_name()
if rel_name not in self.rel_fields:
return
kwargs = filter_rel_attrs(rel_name, **self.rel_attrs)
kwargs[related.field.name] = instance
kwargs['_model'] = related.field.model
make(**kwargs)
def _clean_attrs(self, attrs):
self.fill_in_optional = attrs.pop('_fill_optional', False)
is_rel_field = lambda x: '__' in x
self.iterator_attrs = dict((k, v) for k, v in attrs.items() if is_iterator(v))
self.model_attrs = dict((k, v) for k, v in attrs.items() if not is_rel_field(k))
self.rel_attrs = dict((k, v) for k, v in attrs.items() if is_rel_field(k))
self.rel_fields = [x.split('__')[0] for x in self.rel_attrs.keys() if is_rel_field(x)]
def _skip_field(self, field):
# check for fill optional argument
if isinstance(self.fill_in_optional, bool):
field.fill_optional = self.fill_in_optional
else:
field.fill_optional = field.name in self.fill_in_optional
if isinstance(field, FileField) and not self.create_files:
return True
# Skip links to parent so parent is not created twice.
if isinstance(field, OneToOneField) and self._remote_field(field).parent_link:
return True
if isinstance(field, (AutoField, GenericRelation, OrderWrt)):
return True
if all([field.name not in self.model_attrs, field.name not in self.rel_fields, field.name not in self.attr_mapping]):
# Django is quirky in that BooleanFields are always "blank", but have no default default.
if not field.fill_optional and (not issubclass(field.__class__, Field) or field.has_default() or (field.blank and not isinstance(field, BooleanField))):
return True
if field.name not in self.model_attrs:
if field.name not in self.rel_fields and (field.null and not field.fill_optional):
return True
return False
def _handle_one_to_many(self, instance, attrs):
for k, v in attrs.items():
if django.VERSION >= (1, 9):
manager = getattr(instance, k)
manager.set(v, bulk=False, clear=True)
else:
setattr(instance, k, v)
def _handle_m2m(self, instance):
for key, values in self.m2m_dict.items():
for value in values:
if not value.pk:
value.save()
m2m_relation = getattr(instance, key)
through_model = m2m_relation.through
# using related manager to fire m2m_changed signal
if through_model._meta.auto_created:
m2m_relation.add(*values)
else:
for value in values:
base_kwargs = {
m2m_relation.source_field_name: instance,
m2m_relation.target_field_name: value
}
make(through_model, **base_kwargs)
def _remote_field(self, field):
if django.VERSION >= (1, 9):
return field.remote_field
return field.rel
def generate_value(self, field, commit=True):
'''
Calls the generator associated with a field passing all required args.
Generator Resolution Precedence Order:
-- attr_mapping - mapping per attribute name
-- choices -- mapping from avaiable field choices
-- type_mapping - mapping from user defined type associated generators
-- default_mapping - mapping from pre-defined type associated
generators
`attr_mapping` and `type_mapping` can be defined easily overwriting the
model.
'''
if field.name in self.attr_mapping:
generator = self.attr_mapping[field.name]
elif getattr(field, 'choices'):
generator = random_gen.gen_from_choices(field.choices)
elif isinstance(field, ForeignKey) and issubclass(self._remote_field(field).model, ContentType):
generator = self.type_mapping[ContentType]
elif generators.get(field.__class__):
generator = generators.get(field.__class__)
elif field.__class__ in self.type_mapping:
generator = self.type_mapping[field.__class__]
else:
raise TypeError('%s is not supported by mommy.' % field.__class__)
# attributes like max_length, decimal_places are taken into account when
# generating the value.
generator_attrs = get_required_values(generator, field)
if field.name in self.rel_fields:
generator_attrs.update(filter_rel_attrs(field.name, **self.rel_attrs))
if not commit:
generator = getattr(generator, 'prepare', generator)
return generator(**generator_attrs)
def get_required_values(generator, field):
'''
Gets required values for a generator from the field.
If required value is a function, calls it with field as argument.
If required value is a string, simply fetch the value from the field
and return.
'''
#FIXME: avoid abreviations
rt = {}
if hasattr(generator, 'required'):
for item in generator.required:
if callable(item): # mommy can deal with the nasty hacking too!
key, value = item(field)
rt[key] = value
elif isinstance(item, string_types):
rt[item] = getattr(field, item)
else:
raise ValueError("Required value '%s' is of wrong type. \
Don't make mommy sad." % str(item))
return rt
def filter_rel_attrs(field_name, **rel_attrs):
clean_dict = {}
for k, v in rel_attrs.items():
if k.startswith(field_name + '__'):
splited_key = k.split('__')
key = '__'.join(splited_key[1:])
clean_dict[key] = v
else:
clean_dict[k] = v
return clean_dict
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