290 lines
8.7 KiB
Python
290 lines
8.7 KiB
Python
import datetime
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import decimal
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from typing import Any, Dict, List, Optional, TYPE_CHECKING, Type, Union
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import orm
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from orm.exceptions import ModelDefinitionError, RelationshipInstanceError
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from pydantic import BaseModel, Json
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from pydantic.fields import ModelField
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import sqlalchemy
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if TYPE_CHECKING: # pragma no cover
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from orm.models import Model
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class BaseField:
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__type__ = None
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def __init__(self, *args: Any, **kwargs: Any) -> None:
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name = kwargs.pop("name", None)
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args = list(args)
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if args:
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if isinstance(args[0], str):
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if name is not None:
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raise ModelDefinitionError(
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"Column name cannot be passed positionally and as a keyword."
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)
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name = args.pop(0)
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self.name = name
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self._populate_from_kwargs(kwargs)
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def _populate_from_kwargs(self, kwargs: Dict) -> None:
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self.primary_key = kwargs.pop("primary_key", False)
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self.autoincrement = kwargs.pop(
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"autoincrement", self.primary_key and self.__type__ == int
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)
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self.nullable = kwargs.pop("nullable", not self.primary_key)
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self.default = kwargs.pop("default", None)
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self.server_default = kwargs.pop("server_default", None)
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self.index = kwargs.pop("index", None)
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self.unique = kwargs.pop("unique", None)
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self.pydantic_only = kwargs.pop("pydantic_only", False)
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if self.pydantic_only and self.primary_key:
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raise ModelDefinitionError("Primary key column cannot be pydantic only.")
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@property
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def is_required(self) -> bool:
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return (
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not self.nullable and not self.has_default and not self.is_auto_primary_key
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)
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@property
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def default_value(self) -> Any:
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default = self.default if self.default is not None else self.server_default
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return default() if callable(default) else default
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@property
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def has_default(self) -> bool:
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return self.default is not None or self.server_default is not None
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@property
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def is_auto_primary_key(self) -> bool:
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if self.primary_key:
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return self.autoincrement
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return False
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def get_column(self, name: str = None) -> sqlalchemy.Column:
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self.name = self.name or name
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constraints = self.get_constraints()
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return sqlalchemy.Column(
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self.name,
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self.get_column_type(),
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*constraints,
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primary_key=self.primary_key,
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autoincrement=self.autoincrement,
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nullable=self.nullable,
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index=self.index,
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unique=self.unique,
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default=self.default,
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server_default=self.server_default,
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)
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def get_column_type(self) -> sqlalchemy.types.TypeEngine:
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raise NotImplementedError() # pragma: no cover
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def get_constraints(self) -> Optional[List]:
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return []
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def expand_relationship(self, value: Any, child: "Model") -> Any:
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return value
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class String(BaseField):
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__type__ = str
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def __init__(self, *args: Any, **kwargs: Any) -> None:
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if "length" not in kwargs:
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raise ModelDefinitionError(
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"Param length is required for String model field."
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)
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self.length = kwargs.pop("length")
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super().__init__(*args, **kwargs)
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.String(self.length)
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class Integer(BaseField):
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__type__ = int
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Integer()
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class Text(BaseField):
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__type__ = str
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Text()
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class Float(BaseField):
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__type__ = float
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Float()
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class Boolean(BaseField):
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__type__ = bool
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Boolean()
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class DateTime(BaseField):
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__type__ = datetime.datetime
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.DateTime()
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class Date(BaseField):
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__type__ = datetime.date
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Date()
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class Time(BaseField):
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__type__ = datetime.time
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.Time()
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class JSON(BaseField):
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__type__ = Json
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.JSON()
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class BigInteger(BaseField):
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__type__ = int
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.BigInteger()
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class Decimal(BaseField):
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__type__ = decimal.Decimal
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def __init__(self, *args: Any, **kwargs: Any) -> None:
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if "length" not in kwargs or "precision" not in kwargs:
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raise ModelDefinitionError(
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"Params length and precision are required for Decimal model field."
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)
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self.length = kwargs.pop("length")
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self.precision = kwargs.pop("precision")
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super().__init__(*args, **kwargs)
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def get_column_type(self) -> sqlalchemy.Column:
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return sqlalchemy.DECIMAL(self.length, self.precision)
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def create_dummy_instance(fk: Type["Model"], pk: int = None) -> "Model":
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init_dict = {fk.__pkname__: pk or -1}
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init_dict = {
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**init_dict,
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**{
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k: create_dummy_instance(v.to)
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for k, v in fk.__model_fields__.items()
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if isinstance(v, ForeignKey) and not v.nullable and not v.virtual
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},
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}
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return fk(**init_dict)
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class ForeignKey(BaseField):
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def __init__(
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self,
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to: Type["Model"],
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name: str = None,
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related_name: str = None,
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nullable: bool = True,
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virtual: bool = False,
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) -> None:
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super().__init__(nullable=nullable, name=name)
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self.virtual = virtual
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self.related_name = related_name
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self.to = to
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@property
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def __type__(self) -> Type[BaseModel]:
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return self.to.__pydantic_model__
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def get_constraints(self) -> List[sqlalchemy.schema.ForeignKey]:
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fk_string = self.to.__tablename__ + "." + self.to.__pkname__
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return [sqlalchemy.schema.ForeignKey(fk_string)]
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def get_column_type(self) -> sqlalchemy.Column:
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to_column = self.to.__model_fields__[self.to.__pkname__]
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return to_column.get_column_type()
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def expand_relationship(
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self, value: Any, child: "Model"
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) -> Union["Model", List["Model"]]:
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if isinstance(value, orm.models.Model) and not isinstance(value, self.to):
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raise RelationshipInstanceError(
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f"Relationship error - expecting: {self.to.__name__}, "
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f"but {value.__class__.__name__} encountered."
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)
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if isinstance(value, list) and not isinstance(value, self.to):
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model = [self.expand_relationship(val, child) for val in value]
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return model
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if isinstance(value, self.to):
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model = value
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elif isinstance(value, dict):
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model = self.to(**value)
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else:
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if not isinstance(value, self.to.pk_type()):
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raise RelationshipInstanceError(
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f"Relationship error - ForeignKey {self.to.__name__} is of type {self.to.pk_type()} "
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f"of type {self.__type__} while {type(value)} passed as a parameter."
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)
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model = create_dummy_instance(fk=self.to, pk=value)
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self.add_to_relationship_registry(model, child)
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return model
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def add_to_relationship_registry(self, model: "Model", child: "Model") -> None:
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child_model_name = self.related_name or child.get_name() + "s"
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model._orm_relationship_manager.add_relation(
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model.__class__.__name__.lower(),
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child.__class__.__name__.lower(),
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model,
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child,
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virtual=self.virtual,
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)
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if (
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child_model_name not in model.__fields__
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and child.get_name() not in model.__fields__
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):
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self.register_reverse_model_fields(model, child, child_model_name)
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@staticmethod
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def register_reverse_model_fields(
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model: "Model", child: "Model", child_model_name: str
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) -> None:
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model.__fields__[child_model_name] = ModelField(
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name=child_model_name,
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type_=Optional[child.__pydantic_model__],
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model_config=child.__pydantic_model__.__config__,
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class_validators=child.__pydantic_model__.__validators__,
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)
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model.__model_fields__[child_model_name] = ForeignKey(
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child.__class__, name=child_model_name, virtual=True
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)
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