cleanup, update docs, bump version

ormar/__init__.py

@@ -44,7 +44,7 @@ class UndefinedType:  # pragma no cover
 
 Undefined = UndefinedType()
 
-__version__ = "0.7.3"
+__version__ = "0.7.4"
 __all__ = [
     "Integer",
     "BigInteger",

ormar/fields/foreign_key.py

@@ -97,12 +97,12 @@ class ForeignKeyField(BaseField):
         cls, value: List, child: "Model", to_register: bool, relation_name: str
     ) -> List["Model"]:
         return [
-            cls.expand_relationship(
+            cls.expand_relationship(  # type: ignore
                 value=val,
                 child=child,
                 to_register=to_register,
                 relation_name=relation_name,
-            )  # type: ignore
+            )
             for val in value
         ]
 

ormar/relations/relation.py

@@ -1,5 +1,5 @@
 from enum import Enum
-from typing import List, Optional, TYPE_CHECKING, Type, TypeVar, Union
+from typing import List, Optional, Set, TYPE_CHECKING, Type, TypeVar, Union
 
 import ormar  # noqa I100
 from ormar.exceptions import RelationshipInstanceError  # noqa I100
@@ -31,6 +31,7 @@ class Relation:
         self.manager = manager
         self._owner: "Model" = manager.owner
         self._type: RelationType = type_
+        self._to_remove: Set = set()
         self.to: Type["T"] = to
         self.through: Optional[Type["T"]] = through
         self.related_models: Optional[Union[RelationProxy, "T"]] = (
@@ -39,17 +40,32 @@ class Relation:
             else None
         )
 
+    def _clean_related(self) -> None:
+        cleaned_data = [
+            x
+            for i, x in enumerate(self.related_models)  # type: ignore
+            if i not in self._to_remove
+        ]
+        self.related_models = RelationProxy(
+            relation=self, type_=self._type, data_=cleaned_data
+        )
+        relation_name = self._owner.resolve_relation_name(self._owner, self.to)
+        self._owner.__dict__[relation_name] = cleaned_data
+        self._to_remove = set()
+
     def _find_existing(
         self, child: Union["NewBaseModel", Type["NewBaseModel"]]
     ) -> Optional[int]:
         if not isinstance(self.related_models, RelationProxy):  # pragma nocover
             raise ValueError("Cannot find existing models in parent relation type")
+        if self._to_remove:
+            self._clean_related()
         for ind, relation_child in enumerate(self.related_models[:]):
             try:
                 if relation_child == child:
                     return ind
             except ReferenceError:  # pragma no cover
-                self.related_models.pop(ind)
+                self._to_remove.add(ind)
         return None
 
     def add(self, child: "T") -> None:
@@ -83,4 +99,6 @@ class Relation:
         return self.related_models
 
     def __repr__(self) -> str:  # pragma no cover
+        if self._to_remove:
+            self._clean_related()
         return str(self.related_models)

ormar/relations/relation_proxy.py

@@ -11,8 +11,10 @@ if TYPE_CHECKING:  # pragma no cover
 
 
 class RelationProxy(list):
-    def __init__(self, relation: "Relation", type_: "RelationType") -> None:
-        super().__init__()
+    def __init__(
+        self, relation: "Relation", type_: "RelationType", data_: Any = None
+    ) -> None:
+        super().__init__(data_ or ())
         self.relation: "Relation" = relation
         self.type_: "RelationType" = type_
         self._owner: "Model" = self.relation.manager.owner