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from functools import reduce
from itertools import chain
from typing import Any, Dict, List, Optional, no_type_check
from django.core.serializers.json import DjangoJSONEncoder
from django.db.models import Manager, Model
from django.db.models.fields.files import ImageFieldFile
from django.db.models.fields.reverse_related import (ForeignObjectRel,
OneToOneRel)
from django.utils.encoding import force_str
from django.utils.functional import Promise
from pydantic.v1 import BaseModel, ConfigError, create_model
from pydantic.v1.main import ModelMetaclass
from pydantic.v1.utils import GetterDict
from .fields import ModelSchemaField
_is_base_model_class_defined = False
class ModelSchemaJSONEncoder(DjangoJSONEncoder):
@no_type_check
def default(self, obj): # pragma: nocover
if isinstance(obj, Promise):
return force_str(obj)
return super().default(obj)
def get_field_name(field) -> str:
if issubclass(field.__class__, ForeignObjectRel) and not issubclass(field.__class__, OneToOneRel):
return getattr(field, "related_name", None) or f"{field.name}_set"
else:
return getattr(field, "name", field)
class ModelSchemaMetaclass(ModelMetaclass):
@no_type_check
def __new__(
mcs,
name: str,
bases: tuple,
namespace: dict,
):
cls = super().__new__(mcs, name, bases, namespace)
for base in reversed(bases):
if (
_is_base_model_class_defined
and issubclass(base, ModelSchema)
and base == ModelSchema
):
try:
config = namespace["Config"]
except KeyError as exc:
raise ConfigError(
f"{exc} (Is `Config` class defined?)"
)
include = getattr(config, "include", None)
exclude = getattr(config, "exclude", None)
if include and exclude:
raise ConfigError(
"Only one of 'include' or 'exclude' should be set in "
"configuration."
)
annotations = namespace.get("__annotations__", {})
try:
fields = config.model._meta.get_fields()
except AttributeError as exc:
raise ConfigError(
f"{exc} (Is `Config.model` a valid Django model class?)"
)
if include == '__annotations__':
include = list(annotations.keys())
cls.__config__.include = include
elif include is None and exclude is None:
include = list(annotations.keys()) + [get_field_name(f) for f in fields]
cls.__config__.include = include
field_values = {}
_seen = set()
for field in chain(fields, annotations.copy()):
field_name = get_field_name(field)
if (
field_name in _seen
or (include and field_name not in include)
or (exclude and field_name in exclude)
):
continue
_seen.add(field_name)
python_type = None
pydantic_field = None
if field_name in annotations and field_name in namespace:
python_type = annotations.pop(field_name)
pydantic_field = namespace[field_name]
if (
hasattr(pydantic_field, "default_factory")
and pydantic_field.default_factory
):
pydantic_field = pydantic_field.default_factory()
elif field_name in annotations:
python_type = annotations.pop(field_name)
pydantic_field = (
None if Optional[python_type] == python_type else Ellipsis
)
else:
python_type, pydantic_field = ModelSchemaField(field, name)
field_values[field_name] = (python_type, pydantic_field)
cls.__doc__ = namespace.get("__doc__", config.model.__doc__)
cls.__fields__ = {}
cls.__alias_map__ = {getattr(model_field[1], 'alias', None) or field_name: field_name
for field_name, model_field in field_values.items()}
model_schema = create_model(
name, __base__=cls, __module__=cls.__module__, **field_values
)
return model_schema
return cls
class ProxyGetterNestedObj(GetterDict):
def __init__(self, obj: Any, schema_class):
self._obj = obj
self.schema_class = schema_class
def get(self, key: Any, default: Any = None) -> Any:
alias = self.schema_class.__alias_map__[key]
outer_type_ = self.schema_class.__fields__[alias].outer_type_
if "__" in key:
# Allow double underscores aliases: `first_name: str = Field(alias="user__first_name")`
keys_map = key.split("__")
attr = reduce(lambda a, b: getattr(a, b, default), keys_map, self._obj)
else:
attr = getattr(self._obj, key, None)
is_manager = issubclass(attr.__class__, Manager)
if is_manager and outer_type_ == List[Dict[str, int]]:
attr = list(attr.all().values("id"))
elif is_manager:
attr = list(attr.all())
elif outer_type_ == int and issubclass(type(attr), Model):
attr = attr.id
elif issubclass(attr.__class__, ImageFieldFile) and issubclass(outer_type_, str):
attr = attr.name
return attr
class ModelSchema(BaseModel, metaclass=ModelSchemaMetaclass):
class Config:
orm_mode = True
@classmethod
def schema_json(
cls,
*,
by_alias: bool = True,
encoder_cls: Any = ModelSchemaJSONEncoder,
**dumps_kwargs: Any,
) -> str:
return cls.__config__.json_dumps(
cls.schema(by_alias=by_alias), cls=encoder_cls, **dumps_kwargs
)
@classmethod
@no_type_check
def get_field_names(cls) -> List[str]:
if hasattr(cls.__config__, "exclude"):
django_model_fields = cls.__config__.model._meta.get_fields()
all_fields = [f.name for f in django_model_fields]
return [
name for name in all_fields if name not in cls.__config__.exclude
]
return cls.__config__.include
@classmethod
def from_orm(cls, *args, **kwargs):
return cls.from_django(*args, **kwargs)
@classmethod
def from_django(cls, objs, many=False, context={}):
cls.context = context
if many:
result_objs = []
for obj in objs:
cls.instance = obj
result_objs.append(super().from_orm(ProxyGetterNestedObj(obj, cls)))
return result_objs
cls.instance = objs
return super().from_orm(ProxyGetterNestedObj(objs, cls))
_is_base_model_class_defined = True
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