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models.py
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models.py
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"""
models.py
Base model for dirty_models.
"""
import itertools
from datetime import datetime
from collections import Mapping
from copy import deepcopy
from dirty_models.base import BaseData, InnerFieldTypeMixin
from dirty_models.fields import IntegerField, FloatField, BooleanField, StringField, DateTimeField
from dirty_models.model_types import ListModel
from .fields import BaseField, ModelField, ArrayField
class DirtyModelMeta(type):
"""
Metaclass for dirty_models. It sets automatic fieldnames and
automatic model_class for ModelField fields.
"""
def __init__(cls, name, bases, classdict):
super(DirtyModelMeta, cls).__init__(name, bases, classdict)
fields = {key: field for key, field in cls.__dict__.items()}
structure = {}
read_only_fields = []
for key, field in fields.items():
if isinstance(field, BaseField):
cls.process_base_field(field, key)
structure[field.name] = field
if field.read_only:
read_only_fields.append(field.name)
cls._structure = structure
default_data = {}
for p in bases:
try:
default_data.update(deepcopy(p._default_data))
except AttributeError:
pass
default_data.update(deepcopy(cls._default_data))
default_data.update({f.name: f.default for f in structure.values() if f.default is not None})
cls._default_data = default_data
def process_base_field(cls, field, key):
"""
Preprocess field instances.
:param field: Field object
:param key: Key where field was found
"""
if not field.name:
field.name = key
elif key != field.name:
setattr(cls, field.name, field)
cls.prepare_field(field)
if field.alias:
for alias_name in field.alias:
setattr(cls, alias_name, field)
def prepare_field(cls, field):
if isinstance(field, ModelField) and not field.model_class:
field.model_class = cls
field.__doc__ = field.get_field_docstring()
try:
cls.prepare_field(field.field_type)
field.field_type.__doc__ = field.field_type.get_field_docstring()
except AttributeError:
pass
try:
for inner_field in field.field_types:
cls.prepare_field(inner_field)
except AttributeError:
pass
def recover_model_from_data(model_class, original_data, modified_data, deleted_data):
"""
Function to reconstruct a model from DirtyModel basic information: original data, the modified and deleted
fields.
Necessary for pickle an object
"""
model = model_class(original_data, True)
model.unlock()
model.import_data(modified_data)
model.import_deleted_fields(deleted_data)
model.lock()
return model
class BaseModel(BaseData, metaclass=DirtyModelMeta):
"""
Base model with dirty feature. It stores original data and saves
modifications in other side.
"""
_original_data = None
_modified_data = None
_deleted_fields = None
_default_data = {}
def __init__(self, data=None, flat=False, *args, **kwargs):
super(BaseModel, self).__init__(*args, **kwargs)
self._original_data = {}
self._modified_data = {}
self._deleted_fields = []
self.unlock()
self.import_data(self._default_data)
if isinstance(data, (dict, Mapping)):
self.import_data(data)
self.import_data(kwargs)
if flat:
self.flat_data()
self.lock()
def __reduce__(self):
"""
Reduce function to allow dumpable by pickle
"""
return recover_model_from_data, (self.__class__, self.export_original_data(),
self.export_modified_data(), self.export_deleted_fields(),)
def _get_real_name(self, name):
obj = self.__class__.get_field_obj(name)
try:
return obj.name
except AttributeError:
return None
def set_field_value(self, name, value):
"""
Set the value to the field modified_data
"""
name = self._get_real_name(name)
if name and self._can_write_field(name):
if name in self._deleted_fields:
self._deleted_fields.remove(name)
if self._original_data.get(name) == value:
if self._modified_data.get(name):
self._modified_data.pop(name)
else:
self._modified_data[name] = value
self._prepare_child(value)
if name in self._structure and self._structure[name].read_only:
try:
value.set_read_only(True)
except AttributeError:
pass
def get_field_value(self, name):
"""
Get the field value from the modified data or the original one
"""
name = self._get_real_name(name)
if not name or name in self._deleted_fields:
return None
modified = self._modified_data.get(name)
if modified is not None:
return modified
return self._original_data.get(name)
def delete_field_value(self, name):
"""
Mark this field to be deleted
"""
name = self._get_real_name(name)
if name and self._can_write_field(name):
if name in self._modified_data:
self._modified_data.pop(name)
if name in self._original_data and name not in self._deleted_fields:
self._deleted_fields.append(name)
def reset_field_value(self, name):
"""
Resets value of a field
"""
name = self._get_real_name(name)
if name and self._can_write_field(name):
if name in self._modified_data:
del self._modified_data[name]
if name in self._deleted_fields:
self._deleted_fields.remove(name)
try:
self._original_data[name].clear_modified_data()
except (KeyError, AttributeError):
pass
def is_modified_field(self, name):
"""
Returns whether a field is modified or not
"""
name = self._get_real_name(name)
if name in self._modified_data or name in self._deleted_fields:
return True
try:
return self.get_field_value(name).is_modified()
except:
return False
def import_data(self, data):
"""
Set the fields established in data to the instance
"""
if not self.get_read_only() or not self.is_locked():
if isinstance(data, BaseModel):
data = data.export_data()
if isinstance(data, (dict, Mapping)):
for key, value in data.items():
if hasattr(self, key):
setattr(self, key, value)
def import_deleted_fields(self, data):
"""
Set data fields to deleted
"""
if not self.get_read_only() or not self.is_locked():
if isinstance(data, str):
data = [data]
if isinstance(data, list):
for key in data:
if hasattr(self, key):
delattr(self, key)
else:
keys = key.split('.', 1)
if len(keys) == 2:
child = getattr(self, keys[0])
child.import_deleted_fields(keys[1])
def export_data(self):
"""
Get the results with the modified_data
"""
result = {}
data = self._original_data.copy()
data.update(self._modified_data)
for key, value in data.items():
if key not in self._deleted_fields:
try:
result[key] = value.export_data()
except AttributeError:
result[key] = value
return result
def export_modified_data(self):
"""
Get the modified data
"""
# TODO: why None? Try to get a better flag
result = {key: None for key in self._deleted_fields}
for key, value in self._modified_data.items():
if key not in result.keys():
try:
result[key] = value.export_modified_data()
except AttributeError:
result[key] = value
for key, value in self._original_data.items():
if key not in result.keys():
try:
if value.is_modified():
result[key] = value.export_modified_data()
except AttributeError:
pass
return result
def get_original_field_value(self, name):
"""
Returns original field value or None
"""
name = self._get_real_name(name)
try:
value = self._original_data[name]
except KeyError:
return None
try:
return value.export_original_data()
except AttributeError:
return value
def export_original_data(self):
"""
Get the original data
"""
return {key: self.get_original_field_value(key) for key in self._original_data.keys()}
def export_deleted_fields(self):
"""
Resturns a list with any deleted fields form original data.
In tree models, deleted fields on children will be appended.
"""
result = self._deleted_fields.copy()
for key, value in self._original_data.items():
if key not in result:
try:
partial = value.export_deleted_fields()
for key2 in partial:
result.append(key + '.' + key2)
except AttributeError:
pass
return result
def flat_data(self):
"""
Pass all the data from modified_data to original_data
"""
def flat_field(value):
"""
Flat field data
"""
try:
value.flat_data()
return value
except AttributeError:
return value
modified_dict = self._original_data
modified_dict.update(self._modified_data)
self._original_data = dict((k, flat_field(v))
for k, v in modified_dict.items()
if k not in self._deleted_fields)
self.clear_modified_data()
def clear_modified_data(self):
"""
Clears only the modified data
"""
self._modified_data = {}
self._deleted_fields = []
for value in self._original_data.values():
try:
value.clear_modified_data()
except AttributeError:
pass
def clear(self):
"""
Clears all the data in the object, keeping original data
"""
self._modified_data = {}
self._deleted_fields = [field for field in self._original_data.keys()]
def clear_all(self):
"""
Clears all the data in the object
"""
self._modified_data = {}
self._original_data = {}
self._deleted_fields = []
def get_fields(self):
"""
Returns used fields of model
"""
result = [key for key in self._original_data.keys()
if key not in self._deleted_fields]
result.extend([key for key in self._modified_data.keys()
if key not in result and key not in self._deleted_fields])
return result
def is_modified(self):
"""
Returns whether model is modified or not
"""
if len(self._modified_data) or len(self._deleted_fields):
return True
for value in self._original_data.values():
try:
if value.is_modified():
return True
except AttributeError:
pass
return False
def copy(self):
"""
Creates a copy of model
"""
return self.__class__(data=self.export_data())
def __iter__(self):
def iterfunc():
for field in self.get_fields():
yield (field, getattr(self, field))
return iterfunc()
def _can_write_field(self, name):
return name not in self._structure or (not self._structure[name].read_only and not self.get_read_only()) or \
not self.is_locked()
def _update_read_only(self):
for value in itertools.chain(self._original_data.values(), self._modified_data.values()):
try:
value.set_read_only(self.get_read_only())
except AttributeError:
pass
def __str__(self):
return '{0}({1})'.format(self.__class__.__name__,
",".join(["'{0}': {1}".format(field, repr(self.get_field_value(field)))
for field in sorted(self.get_fields())]))
def __repr__(self):
return str(self)
@classmethod
def get_field_obj(cls, name):
return getattr(cls, name, None)
def _get_fields_by_path(self, field):
"""
Function to perform a function to the field specified. If the function has to be performed by the same object
the field name is retrieved
:param field: Field structure as following:
field_1.*.subfield_2 would apply a the function to the every subfield_2 of the elements in field_1
field_1.1.subfield_2 would apply a the function to the subfield_2 of the element 1 in field_1
:field function: string containing the function in the class to be applied to the field
"""
try:
field, next_field = field.split('.', 1)
except ValueError:
next_field = ''
if field == '*':
return self.get_fields(), next_field
else:
return [field], next_field
def delete_attr_by_path(self, field):
"""
Function for deleting a field specifying the path in the whole model as described
in :func:`dirty:models.models.BaseModel.perform_function_by_path`
"""
fields, next_field = self._get_fields_by_path(field)
for field in fields:
if next_field:
try:
self.get_field_value(field).delete_attr_by_path(next_field)
except AttributeError:
pass
else:
self.delete_field_value(field)
def reset_attr_by_path(self, field):
"""
Function for restoring a field specifying the path in the whole model as described
in :func:`dirty:models.models.BaseModel.perform_function_by_path`
"""
fields, next_field = self._get_fields_by_path(field)
for field in fields:
if next_field:
try:
self.get_field_value(field).reset_attr_by_path(next_field)
except AttributeError:
pass
else:
self.reset_field_value(field)
@classmethod
def get_structure(cls):
"""
Returns a dictionary with model field objects.
:return: dict
"""
return cls._structure.copy()
class BaseDynamicModel(BaseModel):
"""
"""
_dynamic_model = None
def __getattr__(self, name):
try:
return getattr(super(BaseDynamicModel, self), name)
except AttributeError:
return self.get_field_value(name)
def _get_field_type(self, key, value):
"""
Helper to create field object based on value type
"""
if isinstance(value, bool):
return BooleanField(name=key)
elif isinstance(value, int):
return IntegerField(name=key)
elif isinstance(value, float):
return FloatField(name=key)
elif isinstance(value, str):
return StringField(name=key)
elif isinstance(value, datetime):
return DateTimeField(name=key)
elif isinstance(value, (dict, BaseDynamicModel, Mapping)):
return ModelField(name=key, model_class=self._dynamic_model or self.__class__)
elif isinstance(value, BaseModel):
return ModelField(name=key, model_class=value.__class__)
elif isinstance(value, (list, set, ListModel)):
if not len(value):
return None
field_type = self._get_field_type(None, value[0])
return ArrayField(name=key, field_type=field_type)
elif value is None:
return None
else:
raise TypeError("Invalid parameter: %s. Type not supported." % (key,))
def import_data(self, data):
"""
Set the fields established in data to the instance
"""
if isinstance(data, (dict, Mapping)):
for key, value in data.items():
setattr(self, key, value)
class DynamicModel(BaseDynamicModel):
"""
DynamicModel allow to create model with no structure. Each instance has its own
derivated class from DynamicModels.
"""
_next_id = 0
def __init__(self, *args, **kwargs):
super(DynamicModel, self).__init__(*args, **kwargs)
self._structure = {}
def __new__(cls, *args, **kwargs):
new_class = type('DynamicModel_' + str(cls._next_id), (cls,), {'_dynamic_model': DynamicModel})
cls._next_id = id(new_class)
return super(DynamicModel, new_class).__new__(new_class)
def __setattr__(self, name, value):
if not self.__hasattr__(name):
if not self.get_read_only() or not self.is_locked():
field_type = self._get_field_type(name, value)
if not field_type:
return
self._structure[field_type.name] = field_type
setattr(self.__class__, name, field_type)
super(DynamicModel, self).__setattr__(name, value)
def __hasattr__(self, name):
try:
getattr(super(DynamicModel, self), name)
except AttributeError:
try:
self.__dict__[name]
except KeyError:
try:
self.__class__.__dict__[name]
except KeyError:
return False
return True
def __reduce__(self):
"""
Reduce function to allow dumpable by pickle
"""
return recover_model_from_data, (DynamicModel, self.export_original_data(),
self.export_modified_data(), self.export_deleted_fields(),)
def recover_hashmap_model_from_data(model_class, original_data, modified_data, deleted_data, field_type):
"""
Function to reconstruct a model from DirtyModel basic information: original data, the modified and deleted
fields.
Necessary for pickle an object
"""
model = model_class(original_data, True, field_type=field_type[0](**field_type[1]))
model.unlock()
model.import_data(modified_data)
model.import_deleted_fields(deleted_data)
model.lock()
return model
class HashMapModel(InnerFieldTypeMixin, BaseModel):
"""
Hash map model with dirty feature. It stores original data and saves
modifications in other side.
"""
def __reduce__(self):
"""
Reduce function to allow dumpable by pickle
"""
return recover_hashmap_model_from_data, (self.__class__, self.export_original_data(),
self.export_modified_data(), self.export_deleted_fields(),
(self.get_field_type().__class__,
self.get_field_type().export_definition()))
def _get_real_name(self, name):
new_name = super(HashMapModel, self)._get_real_name(name)
if not new_name:
return name
return new_name
def copy(self):
"""
Creates a copy of model
"""
return self.__class__(field_type=self.get_field_type(), data=self.export_data())
def get_validated_object(self, value):
"""
Returns the value validated by the field_type
"""
try:
if self.get_field_type().check_value(value) or self.get_field_type().can_use_value(value):
data = self.get_field_type().use_value(value)
self._prepare_child(data)
return data
else:
return None
except AttributeError:
return value
def __setattr__(self, name, value):
if not self.__hasattr__(name) and (not self.get_read_only() or not self.is_locked()):
if value is None:
delattr(self, name)
return
validated_value = self.get_validated_object(value)
if validated_value is not None and \
(name not in self._original_data or self._original_data[name] != validated_value):
self.set_field_value(name, validated_value)
return
super(HashMapModel, self).__setattr__(name, value)
def __hasattr__(self, name):
try:
getattr(super(HashMapModel, self), name)
except AttributeError:
try:
self.__dict__[name]
except KeyError:
try:
self.__class__.__dict__[name]
except KeyError:
return False
return True
def __getattr__(self, name):
try:
return getattr(super(HashMapModel, self), name)
except AttributeError:
return self.get_field_value(name)
def __delattr__(self, name):
if not self.__hasattr__(name) and (not self.get_read_only() or not self.is_locked()):
self.delete_field_value(name)
return
super(HashMapModel, self).__delattr__(name)
class FastDynamicModel(BaseDynamicModel):
"""
FastDynamicModel allow to create model with no structure.
"""
_field_types = None
def __init__(self, *args, **kwargs):
self._field_types = {}
self._dynamic_model = FastDynamicModel
super(FastDynamicModel, self).__init__(*args, **kwargs)
def _get_real_name(self, name):
new_name = super(FastDynamicModel, self)._get_real_name(name)
if not new_name:
return name
return new_name
def get_validated_object(self, field_type, value):
"""
Returns the value validated by the field_type
"""
if field_type.check_value(value) or field_type.can_use_value(value):
data = field_type.use_value(value)
self._prepare_child(data)
return data
else:
return None
def get_current_structure(self):
"""
Returns a dictionary with model field objects.
:return: dict
"""
struct = self.__class__.get_structure()
struct.update(self._field_types)
return struct
def __setattr__(self, name, value):
if self._field_types is not None and not self.__hasattr__(name) \
and (not self.get_read_only() or not self.is_locked()):
if value is None:
delattr(self, name)
return
try:
field_type = self._field_types[name]
except KeyError:
field_type = self._get_field_type(name, value)
if not field_type:
return
self._field_types[name] = field_type
validated_value = self.get_validated_object(field_type, value)
if validated_value is not None and \
(name not in self._original_data or self._original_data[name] != validated_value):
self.set_field_value(name, validated_value)
return
super(FastDynamicModel, self).__setattr__(name, value)
def __hasattr__(self, name):
try:
getattr(super(FastDynamicModel, self), name)
except AttributeError:
try:
self.__dict__[name]
except KeyError:
try:
self.__class__.__dict__[name]
except KeyError:
return False
return True
def __delattr__(self, name):
if not self.__hasattr__(name) and (not self.get_read_only() or not self.is_locked()):
self.delete_field_value(name)
return
super(FastDynamicModel, self).__delattr__(name)