some cleanup

.flake8

@@ -2,4 +2,5 @@
 ignore = ANN101, ANN102, W503, S101
 max-complexity = 8
 max-line-length = 88
+import-order-style = pycharm
 exclude = p38venv,.pytest_cache

orm/__init__.py

@@ -33,4 +33,5 @@ __all__ = [
     "ModelNotSet",
     "MultipleMatches",
     "NoMatch",
+    "ForeignKey",
 ]

orm/fields/__init__.py

@@ -1,18 +1,18 @@
+from orm.fields.base import BaseField
+from orm.fields.foreign_key import ForeignKey
 from orm.fields.model_fields import (
     BigInteger,
     Boolean,
     Date,
     DateTime,
     Decimal,
-    String,
-    Integer,
-    Text,
     Float,
-    Time,
+    Integer,
     JSON,
+    String,
+    Text,
+    Time,
 )
-from orm.fields.foreign_key import ForeignKey
-from orm.fields.base import BaseField
 
 __all__ = [
     "Decimal",

orm/fields/base.py

@@ -1,8 +1,11 @@
-from typing import Type, Any, Dict, Optional, List
+from typing import Any, Dict, List, Optional, TYPE_CHECKING, Type
 
 import sqlalchemy
 
-from orm import ModelDefinitionError
+from orm import ModelDefinitionError  # noqa I101
+
+if TYPE_CHECKING:  # pragma no cover
+    from orm.models import Model
 
 
 class RequiredParams:

orm/fields/foreign_key.py

@@ -1,9 +1,9 @@
-from typing import Type, List, Any, Union, TYPE_CHECKING, Optional
+from typing import Any, List, Optional, TYPE_CHECKING, Type, Union
 
 import sqlalchemy
 from pydantic import BaseModel
 
-import orm
+import orm  # noqa I101
 from orm.exceptions import RelationshipInstanceError
 from orm.fields.base import BaseField
 
@@ -25,12 +25,12 @@ def create_dummy_instance(fk: Type["Model"], pk: int = None) -> "Model":
 
 class ForeignKey(BaseField):
     def __init__(
-            self,
-            to: Type["Model"],
-            name: str = None,
-            related_name: str = None,
-            nullable: bool = True,
-            virtual: bool = False,
+        self,
+        to: Type["Model"],
+        name: str = None,
+        related_name: str = None,
+        nullable: bool = True,
+        virtual: bool = False,
     ) -> None:
         super().__init__(nullable=nullable, name=name)
         self.virtual = virtual
@@ -50,7 +50,7 @@ class ForeignKey(BaseField):
         return to_column.get_column_type()
 
     def expand_relationship(
-            self, value: Any, child: "Model"
+        self, value: Any, child: "Model"
     ) -> Optional[Union["Model", List["Model"]]]:
 
         if value is None:
@@ -80,9 +80,7 @@ class ForeignKey(BaseField):
             model = create_dummy_instance(fk=self.to, pk=value)
 
         model._orm_relationship_manager.add_relation(
-            model,
-            child,
-            virtual=self.virtual,
+            model, child, virtual=self.virtual,
         )
 
         return model

orm/fields/model_fields.py

@@ -4,7 +4,7 @@ import decimal
 import sqlalchemy
 from pydantic import Json
 
-from orm.fields.base import BaseField, RequiredParams
+from orm.fields.base import BaseField, RequiredParams  # noqa I101
 
 
 @RequiredParams("length")

orm/models.py

@@ -6,18 +6,16 @@ from typing import Any, List, Optional, TYPE_CHECKING, Tuple, Type, TypeVar
 from typing import Callable, Dict, Set
 
 import databases
-
-import orm.queryset as qry
-from orm.exceptions import ModelDefinitionError
-from orm import ForeignKey
-from orm.fields.base import BaseField
-from orm.relations import RelationshipManager
-
 import pydantic
+import sqlalchemy
 from pydantic import BaseConfig, BaseModel, create_model
 from pydantic.fields import ModelField
 
-import sqlalchemy
+import orm.queryset as qry  # noqa I100
+from orm import ForeignKey
+from orm.exceptions import ModelDefinitionError
+from orm.fields.base import BaseField
+from orm.relations import RelationshipManager
 
 relationship_manager = RelationshipManager()
 

orm/queryset.py

@@ -11,16 +11,15 @@ from typing import (
 )
 
 import databases
+import sqlalchemy
+from sqlalchemy import text
 
-import orm
+import orm  # noqa I100
 import orm.fields.foreign_key
 from orm import ForeignKey
 from orm.exceptions import MultipleMatches, NoMatch, QueryDefinitionError
 from orm.fields.base import BaseField
 
-import sqlalchemy
-from sqlalchemy import text
-
 if TYPE_CHECKING:  # pragma no cover
     from orm.models import Model
 

orm/relations.py

@@ -16,7 +16,7 @@ def get_table_alias() -> str:
 
 
 def get_relation_config(
-        relation_type: str, table_name: str, field: ForeignKey
+    relation_type: str, table_name: str, field: ForeignKey
 ) -> Dict[str, str]:
     alias = get_table_alias()
     config = {
@@ -37,7 +37,7 @@ class RelationshipManager:
         self._relations = dict()
 
     def add_relation_type(
-            self, relations_key: str, reverse_key: str, field: ForeignKey, table_name: str
+        self, relations_key: str, reverse_key: str, field: ForeignKey, table_name: str
     ) -> None:
         if relations_key not in self._relations:
             self._relations[relations_key] = get_relation_config(
@@ -56,10 +56,7 @@ class RelationshipManager:
                     del self._relations[rel_type][model._orm_id]
 
     def add_relation(
-            self,
-            parent: "FakePydantic",
-            child: "FakePydantic",
-            virtual: bool = False,
+        self, parent: "FakePydantic", child: "FakePydantic", virtual: bool = False,
     ) -> None:
         parent_id = parent._orm_id
         child_id = child._orm_id
@@ -97,7 +94,7 @@ class RelationshipManager:
         return False
 
     def get(
-            self, relations_key: str, instance: "FakePydantic"
+        self, relations_key: str, instance: "FakePydantic"
     ) -> Union["Model", List["Model"]]:
         if relations_key in self._relations:
             if instance._orm_id in self._relations[relations_key]:
@@ -108,8 +105,8 @@ class RelationshipManager:
     def resolve_relation_join(self, from_table: str, to_table: str) -> str:
         for relation_name, relation in self._relations.items():
             if (
-                    relation["source_table"] == from_table
-                    and relation["target_table"] == to_table
+                relation["source_table"] == from_table
+                and relation["target_table"] == to_table
             ):
                 return self._relations[relation_name]["table_alias"]
         return ""