def __init__(self,
model,
field_values=None,
none_p=None,
overwrite_defaults=None,
constraints=None,
follow_fk=None,
generate_fk=None,
follow_m2m=None,
generate_m2m=None):
'''
Parameters:
``model``: A model class which is used to create the test data.
``field_values``: A dictionary with field names of ``model`` as
keys. Values may be static values that are assigned to the field,
a ``Generator`` instance that generates a value on the fly or a
callable which takes no arguments and returns the wanted value.
``none_p``: The chance (between 0 and 1, 1 equals 100%) to
assign ``None`` to nullable fields.
``overwrite_defaults``: All default values of fields are preserved
by default. If set to ``True``, default values will be treated
like any other field.
``constraints``: A list of callables. The constraints are used to
verify if the created model instance may be used. The callable
gets the actual model as first and the instance as second
parameter. The instance is not populated yet at this moment. The
callable may raise an :exc:`InvalidConstraint` exception to
indicate which fields violate the constraint.
``follow_fk``: A boolean value indicating if foreign keys should be
set to random, already existing, instances of the related model.
``generate_fk``: A boolean which indicates if related models should
also be created with random values. The *follow_fk* parameter will
be ignored if *generate_fk* is set to ``True``.
``follow_m2m``: A tuple containing minium and maximum of model
instances that are assigned to ``ManyToManyField``. No new
instances will be created. Default is (1, 5). You can ignore
``ManyToManyField`` fields by setting this parameter to ``False``.
``generate_m2m``: A tuple containing minimum and maximum number of
model instance that are newly created and assigned to the
``ManyToManyField``. Default is ``False`` which disables the
generation of new related instances. The value of ``follow_m2m``
will be ignored if this parameter is set.
'''
self.model = model
self.field_values = Values(self.__class__.field_values)
self.field_values += Values(field_values)
self.constraints = constraints or []
if none_p is not None:
self.none_p = none_p
if overwrite_defaults is not None:
self.overwrite_defaults = overwrite_defaults
if follow_fk is not None:
self.follow_fk = follow_fk
if not isinstance(self.follow_fk, Link):
self.follow_fk = Link(self.follow_fk)
if generate_fk is not None:
self.generate_fk = generate_fk
if not isinstance(self.generate_fk, Link):
self.generate_fk = Link(self.generate_fk)
if follow_m2m is not None:
if not isinstance(follow_m2m, dict):
if follow_m2m:
follow_m2m = Link({'ALL': follow_m2m})
else:
follow_m2m = Link(False)
self.follow_m2m = follow_m2m
if not isinstance(self.follow_m2m, Link):
self.follow_m2m = Link(self.follow_m2m)
if generate_m2m is not None:
if not isinstance(generate_m2m, dict):
if generate_m2m:
generate_m2m = Link({'ALL': generate_m2m})
else:
generate_m2m = Link(False)
self.generate_m2m = generate_m2m
if not isinstance(self.generate_m2m, Link):
self.generate_m2m = Link(self.generate_m2m)
for constraint in self.default_constraints:
self.add_constraint(constraint)
self._field_generators = {}
self.prepare_class()
class AutoFixtureBase(object):
'''
.. We don't support the following fields yet:
* ``XMLField``
* ``FileField``
Patches are welcome.
'''
class IGNORE_FIELD(object):
pass
overwrite_defaults = False
follow_fk = True
generate_fk = False
follow_m2m = {'ALL': (1, 5)}
generate_m2m = False
none_p = 0.2
tries = 1000
field_to_generator = OrderedDict((
(fields.BooleanField, generators.BooleanGenerator),
(fields.NullBooleanField, generators.NullBooleanGenerator),
(fields.DateTimeField, generators.DateTimeGenerator),
(fields.DateField, generators.DateGenerator),
(fields.PositiveSmallIntegerField,
generators.PositiveSmallIntegerGenerator),
(fields.PositiveIntegerField, generators.PositiveIntegerGenerator),
(fields.SmallIntegerField, generators.SmallIntegerGenerator),
(fields.IntegerField, generators.IntegerGenerator),
(fields.FloatField, generators.FloatGenerator),
(fields.IPAddressField, generators.IPAddressGenerator),
(fields.GenericIPAddressField, generators.IPAddressGenerator),
(fields.TextField, generators.LoremGenerator),
(fields.TimeField, generators.TimeGenerator),
(ImageField, generators.ImageGenerator),
))
# UUIDField was added in Django 1.8
if hasattr(fields, 'UUIDField'):
field_to_generator[fields.UUIDField] = generators.UUIDGenerator
field_values = Values()
default_constraints = [
constraints.unique_constraint, constraints.unique_together_constraint
]
def __init__(self,
model,
field_values=None,
none_p=None,
overwrite_defaults=None,
constraints=None,
follow_fk=None,
generate_fk=None,
follow_m2m=None,
generate_m2m=None):
'''
Parameters:
``model``: A model class which is used to create the test data.
``field_values``: A dictionary with field names of ``model`` as
keys. Values may be static values that are assigned to the field,
a ``Generator`` instance that generates a value on the fly or a
callable which takes no arguments and returns the wanted value.
``none_p``: The chance (between 0 and 1, 1 equals 100%) to
assign ``None`` to nullable fields.
``overwrite_defaults``: All default values of fields are preserved
by default. If set to ``True``, default values will be treated
like any other field.
``constraints``: A list of callables. The constraints are used to
verify if the created model instance may be used. The callable
gets the actual model as first and the instance as second
parameter. The instance is not populated yet at this moment. The
callable may raise an :exc:`InvalidConstraint` exception to
indicate which fields violate the constraint.
``follow_fk``: A boolean value indicating if foreign keys should be
set to random, already existing, instances of the related model.
``generate_fk``: A boolean which indicates if related models should
also be created with random values. The *follow_fk* parameter will
be ignored if *generate_fk* is set to ``True``.
``follow_m2m``: A tuple containing minium and maximum of model
instances that are assigned to ``ManyToManyField``. No new
instances will be created. Default is (1, 5). You can ignore
``ManyToManyField`` fields by setting this parameter to ``False``.
``generate_m2m``: A tuple containing minimum and maximum number of
model instance that are newly created and assigned to the
``ManyToManyField``. Default is ``False`` which disables the
generation of new related instances. The value of ``follow_m2m``
will be ignored if this parameter is set.
'''
self.model = model
self.field_values = Values(self.__class__.field_values)
self.field_values += Values(field_values)
self.constraints = constraints or []
if none_p is not None:
self.none_p = none_p
if overwrite_defaults is not None:
self.overwrite_defaults = overwrite_defaults
if follow_fk is not None:
self.follow_fk = follow_fk
if not isinstance(self.follow_fk, Link):
self.follow_fk = Link(self.follow_fk)
if generate_fk is not None:
self.generate_fk = generate_fk
if not isinstance(self.generate_fk, Link):
self.generate_fk = Link(self.generate_fk)
if follow_m2m is not None:
if not isinstance(follow_m2m, dict):
if follow_m2m:
follow_m2m = Link({'ALL': follow_m2m})
else:
follow_m2m = Link(False)
self.follow_m2m = follow_m2m
if not isinstance(self.follow_m2m, Link):
self.follow_m2m = Link(self.follow_m2m)
if generate_m2m is not None:
if not isinstance(generate_m2m, dict):
if generate_m2m:
generate_m2m = Link({'ALL': generate_m2m})
else:
generate_m2m = Link(False)
self.generate_m2m = generate_m2m
if not isinstance(self.generate_m2m, Link):
self.generate_m2m = Link(self.generate_m2m)
for constraint in self.default_constraints:
self.add_constraint(constraint)
self._field_generators = {}
self.prepare_class()
def prepare_class(self):
'''
This method is called after the :meth:`__init__` method. It has no
semantic by default.
'''
pass
def add_field_value(self, name, value):
'''
Pass a *value* that should be assigned to the field called *name*.
Thats the same as specifying it in the *field_values* argument of the
:meth:`constructor <autofixture.base.AutoFixture.__init__>`.
'''
self.field_values[name] = value
def add_constraint(self, constraint):
'''
Add a *constraint* to the autofixture.
'''
self.constraints.append(constraint)
def is_inheritance_parent(self, field):
'''
Checks if the field is the automatically created OneToOneField used by
django mulit-table inheritance
'''
return (isinstance(field, related.OneToOneField) and field.primary_key
and issubclass(field.model, get_remote_field_to(field)))
def get_generator(self, field):
'''
Return a value generator based on the field instance that is passed to
this method. This function may return ``None`` which means that the
specified field will be ignored (e.g. if no matching generator was
found).
'''
if isinstance(field, fields.AutoField):
return None
if self.is_inheritance_parent(field):
return None
if (field.default is not fields.NOT_PROVIDED
and not self.overwrite_defaults
and field.name not in self.field_values):
return None
kwargs = {}
if field.name in self.field_values:
value = self.field_values[field.name]
if isinstance(value, generators.Generator):
return value
elif isinstance(value, AutoFixture):
return generators.InstanceGenerator(autofixture=value)
elif callable(value):
return generators.CallableGenerator(value=value)
return generators.StaticGenerator(value=value)
if field.null:
kwargs['empty_p'] = self.none_p
if field.choices:
return generators.ChoicesGenerator(choices=field.choices, **kwargs)
if isinstance(field, related.ForeignKey):
# if generate_fk is set, follow_fk is ignored.
is_self_fk = (get_remote_field_to(field)().__class__ == self.model)
if field.name in self.generate_fk and not is_self_fk:
return generators.InstanceGenerator(
autofixture.get(
get_remote_field_to(field),
follow_fk=self.follow_fk.get_deep_links(field.name),
generate_fk=self.generate_fk.get_deep_links(
field.name)),
limit_choices_to=get_remote_field(field).limit_choices_to)
if field.name in self.follow_fk:
selected = generators.InstanceSelector(
get_remote_field_to(field),
limit_choices_to=get_remote_field(field).limit_choices_to)
if selected.get_value() is not None:
return selected
if field.blank or field.null:
return generators.NoneGenerator()
if is_self_fk and not field.null:
raise CreateInstanceError(
u'Cannot resolve self referencing field "%s" to "%s" without null=True'
% (field.name, '%s.%s' % (
get_remote_field_to(field)._meta.app_label,
get_remote_field_to(field)._meta.object_name,
)))
raise CreateInstanceError(
u'Cannot resolve ForeignKey "%s" to "%s". Provide either '
u'"follow_fk" or "generate_fk" parameters.' %
(field.name, '%s.%s' % (
get_remote_field_to(field)._meta.app_label,
get_remote_field_to(field)._meta.object_name,
)))
if isinstance(field, related.ManyToManyField):
if field.name in self.generate_m2m:
min_count, max_count = self.generate_m2m[field.name]
return generators.MultipleInstanceGenerator(
autofixture.get(get_remote_field_to(field)),
limit_choices_to=get_remote_field(field).limit_choices_to,
min_count=min_count,
max_count=max_count,
**kwargs)
if field.name in self.follow_m2m:
min_count, max_count = self.follow_m2m[field.name]
return generators.InstanceSelector(
get_remote_field_to(field),
limit_choices_to=get_remote_field(field).limit_choices_to,
min_count=min_count,
max_count=max_count,
**kwargs)
if field.blank or field.null:
return generators.StaticGenerator([])
raise CreateInstanceError(
u'Cannot assign instances of "%s" to ManyToManyField "%s". '
u'Provide either "follow_m2m" or "generate_m2m" argument.' % (
'%s.%s' % (
get_remote_field_to(field)._meta.app_label,
get_remote_field_to(field)._meta.object_name,
),
field.name,
))
if isinstance(field, fields.FilePathField):
return generators.FilePathGenerator(path=field.path,
match=field.match,
recursive=field.recursive,
max_length=field.max_length,
**kwargs)
if isinstance(field, fields.CharField):
if isinstance(field, fields.SlugField):
generator = generators.SlugGenerator
elif isinstance(field, fields.EmailField):
return generators.EmailGenerator(
max_length=min(field.max_length, 30))
elif isinstance(field, fields.URLField):
return generators.URLGenerator(
max_length=min(field.max_length, 25))
elif field.max_length > 15:
return generators.LoremSentenceGenerator(
common=False, max_length=field.max_length)
else:
generator = generators.StringGenerator
return generator(max_length=field.max_length)
if isinstance(field, fields.DecimalField):
return generators.DecimalGenerator(
decimal_places=field.decimal_places,
max_digits=field.max_digits)
if hasattr(fields, 'BigIntegerField'):
if isinstance(field, fields.BigIntegerField):
return generators.IntegerGenerator(
min_value=-field.MAX_BIGINT - 1,
max_value=field.MAX_BIGINT,
**kwargs)
if isinstance(field, ImageField):
return generators.ImageGenerator(storage=field.storage, **kwargs)
for field_class, generator in self.field_to_generator.items():
if isinstance(field, field_class):
return generator(**kwargs)
return None
def get_value(self, field):
'''
Return a random value that can be assigned to the passed *field*
instance.
'''
if field not in self._field_generators:
self._field_generators[field] = self.get_generator(field)
generator = self._field_generators[field]
if generator is None:
return self.IGNORE_FIELD
value = generator()
return value
def process_field(self, instance, field):
value = self.get_value(field)
if value is self.IGNORE_FIELD:
return
setattr(instance, field.name, value)
def process_m2m(self, instance, field):
# check django's version number to determine how intermediary models
# are checked if they are auto created or not.
auto_created_through_model = False
through = get_remote_field(field).through
auto_created_through_model = through._meta.auto_created
if auto_created_through_model:
return self.process_field(instance, field)
# if m2m relation has intermediary model:
# * only generate relation if 'generate_m2m' is given
# * first generate intermediary model and assign a newly created
# related model to the foreignkey
kwargs = {}
if field.name in self.generate_m2m:
# get fk to related model on intermediary model
related_fks = [fk
for fk in through._meta.fields
if isinstance(fk, related.ForeignKey) and \
get_remote_field_to(fk) is get_remote_field_to(field)]
self_fks = [fk
for fk in through._meta.fields
if isinstance(fk, related.ForeignKey) and \
get_remote_field_to(fk) is self.model]
assert len(related_fks) == 1
assert len(self_fks) == 1
related_fk = related_fks[0]
self_fk = self_fks[0]
min_count, max_count = self.generate_m2m[field.name]
intermediary_model = generators.MultipleInstanceGenerator(
AutoFixture(through,
field_values={
self_fk.name:
instance,
related_fk.name:
generators.InstanceGenerator(
autofixture.get(
get_remote_field_to(field)))
}),
min_count=min_count,
max_count=max_count,
**kwargs).generate()
def check_constrains(self, *args, **kwargs):
raise TypeError(
'This method was renamed recently, since it contains a typo. '
'Please use the check_constraints method from now on.')
def check_constraints(self, instance):
'''
Return fieldnames which need recalculation.
'''
recalc_fields = []
for constraint in self.constraints:
try:
constraint(self.model, instance)
except constraints.InvalidConstraint as e:
recalc_fields.extend(e.fields)
return recalc_fields
def post_process_instance(self, instance, commit):
'''
Overwrite this method to modify the created *instance* before it gets
returned by the :meth:`create` or :meth:`create_one`.
It gets the generated *instance* and must return the modified
instance. The *commit* parameter indicates the *commit* value that the
user passed into the :meth:`create` method. It defaults to ``True``
and should be respected, which means if it is set to ``False``, the
*instance* should not be saved.
'''
return instance
def pre_process_instance(self, instance):
'''
Same as :meth:`post_process_instance`, but it is being called before
saving an *instance*.
'''
return instance
def create_one(self, commit=True):
'''
Create and return one model instance. If *commit* is ``False`` the
instance will not be saved and many to many relations will not be
processed.
Subclasses that override ``create_one`` can specify arbitrary keyword
arguments. They will be passed through by the
:meth:`autofixture.base.AutoFixture.create` method and the helper
functions :func:`autofixture.create` and
:func:`autofixture.create_one`.
May raise :exc:`CreateInstanceError` if constraints are not satisfied.
'''
tries = self.tries
instance = self.model()
process = instance._meta.fields
while process and tries > 0:
for field in process:
self.process_field(instance, field)
process = self.check_constraints(instance)
tries -= 1
if tries == 0:
raise CreateInstanceError(
u'Cannot solve constraints for "%s", tried %d times. '
u'Please check value generators or model constraints. '
u'At least the following fields are involved: %s' % (
'%s.%s' %
(self.model._meta.app_label, self.model._meta.object_name),
self.tries,
', '.join([field.name for field in process]),
))
instance = self.pre_process_instance(instance)
if commit:
instance.save()
#to handle particular case of GenericRelation
#in Django pre 1.6 it appears in .many_to_many
many_to_many = [
f for f in instance._meta.many_to_many
if not isinstance(f, get_GenericRelation())
]
for field in many_to_many:
self.process_m2m(instance, field)
signals.instance_created.send(sender=self,
model=self.model,
instance=instance,
committed=commit)
post_process_kwargs = {}
if 'commit' in getargnames(self.post_process_instance):
post_process_kwargs['commit'] = commit
else:
warnings.warn(
"Subclasses of AutoFixture need to provide a `commit` "
"argument for post_process_instance methods",
DeprecationWarning)
return self.post_process_instance(instance, **post_process_kwargs)
def create(self, count=1, commit=True, **kwargs):
'''
Create and return ``count`` model instances. If *commit* is ``False``
the instances will not be saved and many to many relations will not be
processed.
May raise ``CreateInstanceError`` if constraints are not satisfied.
The method internally calls :meth:`create_one` to generate instances.
'''
object_list = []
for i in range(count):
instance = self.create_one(commit=commit, **kwargs)
object_list.append(instance)
return object_list
def iter(self, count=1, commit=True):
for i in range(count):
yield self.create_one(commit=commit)
def __iter__(self):
yield self.create_one()
class BasicValueFixtureBase(AutoFixture):
field_values = Values(blankchars='bar')
class AutoFixtureBase(object):
'''
.. We don't support the following fields yet:
* ``XMLField``
* ``FileField``
* ``ImageField``
Patches are welcome.
'''
class IGNORE_FIELD(object):
pass
overwrite_defaults = False
follow_fk = True
generate_fk = False
follow_m2m = {'ALL': (1,5)}
generate_m2m = False
none_p = 0.2
tries = 1000
field_to_generator = SortedDict((
(fields.BooleanField, generators.BooleanGenerator),
(fields.NullBooleanField, generators.NullBooleanGenerator),
(fields.DateTimeField, generators.DateTimeGenerator),
(fields.DateField, generators.DateGenerator),
(fields.PositiveSmallIntegerField, generators.PositiveSmallIntegerGenerator),
(fields.PositiveIntegerField, generators.PositiveIntegerGenerator),
(fields.SmallIntegerField, generators.SmallIntegerGenerator),
(fields.IntegerField, generators.IntegerGenerator),
(fields.FloatField, generators.FloatGenerator),
(fields.IPAddressField, generators.IPAddressGenerator),
(fields.TextField, generators.LoremGenerator),
(fields.TimeField, generators.TimeGenerator),
))
field_values = Values()
default_constraints = [
constraints.unique_constraint,
constraints.unique_together_constraint]
def __init__(self, model,
field_values=None, none_p=None, overwrite_defaults=None,
constraints=None, follow_fk=None, generate_fk=None,
follow_m2m=None, generate_m2m=None):
'''
Parameters:
``model``: A model class which is used to create the test data.
``field_values``: A dictionary with field names of ``model`` as
keys. Values may be static values that are assigned to the field,
a ``Generator`` instance that generates a value on the fly or a
callable which takes no arguments and returns the wanted value.
``none_p``: The chance (between 0 and 1, 1 equals 100%) to
assign ``None`` to nullable fields.
``overwrite_defaults``: All default values of fields are preserved
by default. If set to ``True``, default values will be treated
like any other field.
``constraints``: A list of callables. The constraints are used to
verify if the created model instance may be used. The callable
gets the actual model as first and the instance as second
parameter. The instance is not populated yet at this moment. The
callable may raise an :exc:`InvalidConstraint` exception to
indicate which fields violate the constraint.
``follow_fk``: A boolean value indicating if foreign keys should be
set to random, already existing, instances of the related model.
``generate_fk``: A boolean which indicates if related models should
also be created with random values. The *follow_fk* parameter will
be ignored if *generate_fk* is set to ``True``.
``follow_m2m``: A tuple containing minium and maximum of model
instances that are assigned to ``ManyToManyField``. No new
instances will be created. Default is (1, 5). You can ignore
``ManyToManyField`` fields by setting this parameter to ``False``.
``generate_m2m``: A tuple containing minimum and maximum number of
model instance that are newly created and assigned to the
``ManyToManyField``. Default is ``False`` which disables the
generation of new related instances. The value of ``follow_m2m``
will be ignored if this parameter is set.
'''
self.model = model
self.field_values = Values(self.__class__.field_values)
self.field_values += Values(field_values)
self.constraints = constraints or []
if none_p is not None:
self.none_p = none_p
if overwrite_defaults is not None:
self.overwrite_defaults = overwrite_defaults
if follow_fk is not None:
self.follow_fk = follow_fk
if not isinstance(self.follow_fk, Link):
self.follow_fk = Link(self.follow_fk)
if generate_fk is not None:
self.generate_fk = generate_fk
if not isinstance(self.generate_fk, Link):
self.generate_fk = Link(self.generate_fk)
if follow_m2m is not None:
if not isinstance(follow_m2m, dict):
if follow_m2m:
follow_m2m = Link({'ALL': follow_m2m})
else:
follow_m2m = Link(False)
self.follow_m2m = follow_m2m
if not isinstance(self.follow_m2m, Link):
self.follow_m2m = Link(self.follow_m2m)
if generate_m2m is not None:
if not isinstance(generate_m2m, dict):
if generate_m2m:
generate_m2m = Link({'ALL': generate_m2m})
else:
generate_m2m = Link(False)
self.generate_m2m = generate_m2m
if not isinstance(self.generate_m2m, Link):
self.generate_m2m = Link(self.generate_m2m)
for constraint in self.default_constraints:
self.add_constraint(constraint)
self._field_generators = {}
self.prepare_class()
def prepare_class(self):
'''
This method is called after the :meth:`__init__` method. It has no
semantic by default.
'''
pass
def add_field_value(self, name, value):
'''
Pass a *value* that should be assigned to the field called *name*.
Thats the same as specifying it in the *field_values* argument of the
:meth:`constructor <autofixture.base.AutoFixture.__init__>`.
'''
self.field_values[name] = value
def add_constraint(self, constraint):
'''
Add a *constraint* to the autofixture.
'''
self.constraints.append(constraint)
def get_generator(self, field):
'''
Return a value generator based on the field instance that is passed to
this method. This function may return ``None`` which means that the
specified field will be ignored (e.g. if no matching generator was
found).
'''
if isinstance(field, fields.AutoField):
return None
if (
field.default is not fields.NOT_PROVIDED and
not self.overwrite_defaults and
field.name not in self.field_values):
return None
kwargs = {}
if field.name in self.field_values:
value = self.field_values[field.name]
if isinstance(value, generators.Generator):
return value
elif isinstance(value, AutoFixture):
return generators.InstanceGenerator(autofixture=value)
elif callable(value):
return generators.CallableGenerator(value=value)
return generators.StaticGenerator(value=value)
if field.null:
kwargs['empty_p'] = self.none_p
if field.choices:
return generators.ChoicesGenerator(choices=field.choices, **kwargs)
if isinstance(field, related.ForeignKey):
# if generate_fk is set, follow_fk is ignored.
if field.name in self.generate_fk:
return generators.InstanceGenerator(
AutoFixture(
field.rel.to,
follow_fk=self.follow_fk.get_deep_links(field.name),
generate_fk=self.generate_fk.get_deep_links(field.name)),
limit_choices_to=field.rel.limit_choices_to)
if field.name in self.follow_fk:
return generators.InstanceSelector(
field.rel.to,
limit_choices_to=field.rel.limit_choices_to)
if field.blank or field.null:
return generators.NoneGenerator()
raise CreateInstanceError(
u'Cannot resolve ForeignKey "%s" to "%s". Provide either '
u'"follow_fk" or "generate_fk" parameters.' % (
field.name,
'%s.%s' % (
field.rel.to._meta.app_label,
field.rel.to._meta.object_name,
)
))
if isinstance(field, related.ManyToManyField):
if field.name in self.generate_m2m:
min_count, max_count = self.generate_m2m[field.name]
return generators.MultipleInstanceGenerator(
AutoFixture(
field.rel.to
),
limit_choices_to=field.rel.limit_choices_to,
min_count=min_count,
max_count=max_count,
**kwargs)
if field.name in self.follow_m2m:
min_count, max_count = self.follow_m2m[field.name]
return generators.InstanceSelector(
field.rel.to,
limit_choices_to=field.rel.limit_choices_to,
min_count=min_count,
max_count=max_count,
**kwargs)
if field.blank or field.null:
return generators.StaticGenerator([])
raise CreateInstanceError(
u'Cannot assign instances of "%s" to ManyToManyField "%s". '
u'Provide either "follow_m2m" or "generate_m2m" argument.' % (
'%s.%s' % (
field.rel.to._meta.app_label,
field.rel.to._meta.object_name,
),
field.name,
))
if isinstance(field, fields.FilePathField):
return generators.FilePathGenerator(
path=field.path, match=field.match, recursive=field.recursive,
max_length=field.max_length, **kwargs)
if isinstance(field, fields.CharField):
if isinstance(field, fields.SlugField):
generator = generators.SlugGenerator
elif isinstance(field, fields.EmailField):
return generators.EmailGenerator(
max_length=min(field.max_length, 30))
elif isinstance(field, fields.URLField):
return generators.URLGenerator(
max_length=min(field.max_length, 25))
elif field.max_length > 15:
return generators.LoremSentenceGenerator(
common=False,
max_length=field.max_length)
else:
generator = generators.StringGenerator
return generator(max_length=field.max_length)
if isinstance(field, fields.DecimalField):
return generators.DecimalGenerator(
decimal_places=field.decimal_places,
max_digits=field.max_digits)
if hasattr(fields, 'BigIntegerField'):
if isinstance(field, fields.BigIntegerField):
return generators.IntegerGenerator(
min_value=-field.MAX_BIGINT - 1,
max_value=field.MAX_BIGINT,
**kwargs)
for field_class, generator in self.field_to_generator.items():
if isinstance(field, field_class):
return generator(**kwargs)
return None
def get_value(self, field):
'''
Return a random value that can be assigned to the passed *field*
instance.
'''
if field not in self._field_generators:
self._field_generators[field] = self.get_generator(field)
generator = self._field_generators[field]
if generator is None:
return self.IGNORE_FIELD
value = generator()
return value
def process_field(self, instance, field):
value = self.get_value(field)
if value is self.IGNORE_FIELD:
return
setattr(instance, field.name, value)
def process_m2m(self, instance, field):
# check django's version number to determine how intermediary models
# are checked if they are auto created or not.
auto_created_through_model = False
through = field.rel.through
auto_created_through_model = through._meta.auto_created
if auto_created_through_model:
return self.process_field(instance, field)
# if m2m relation has intermediary model:
# * only generate relation if 'generate_m2m' is given
# * first generate intermediary model and assign a newly created
# related model to the foreignkey
kwargs = {}
if field.name in self.generate_m2m:
# get fk to related model on intermediary model
related_fks = [fk
for fk in through._meta.fields
if isinstance(fk, related.ForeignKey) and \
fk.rel.to is field.rel.to]
self_fks = [fk
for fk in through._meta.fields
if isinstance(fk, related.ForeignKey) and \
fk.rel.to is self.model]
assert len(related_fks) == 1
assert len(self_fks) == 1
related_fk = related_fks[0]
self_fk = self_fks[0]
min_count, max_count = self.generate_m2m[field.name]
intermediary_model = generators.MultipleInstanceGenerator(
AutoFixture(
through,
field_values={
self_fk.name: instance,
related_fk.name: generators.InstanceGenerator(
AutoFixture(field.rel.to))
}),
min_count=min_count,
max_count=max_count,
**kwargs).generate()
def check_constrains(self, instance):
'''
Return fieldnames which need recalculation.
'''
recalc_fields = []
for constraint in self.constraints:
try:
constraint(self.model, instance)
except constraints.InvalidConstraint, e:
recalc_fields.extend(e.fields)
return recalc_fields
