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from typing import Any, TypeVar, cast, no_type_check
from sqlalchemy.ext.mutable import Mutable
from sqlalchemy.ext.mutable import MutableList as SQLMutableList
from typing_extensions import Self
T = TypeVar("T", bound="Any")
class MutableList(SQLMutableList[T]): # pragma: no cover
"""A list type that implements :class:`Mutable`.
The :class:`MutableList` object implements a list that will
emit change events to the underlying mapping when the contents of
the list are altered, including when values are added or removed.
This is a replication of default Mutablelist provide by SQLAlchemy.
The difference here is the properties _removed which keep every element
removed from the list in order to be able to delete them after commit
and keep them when session rolled back.
"""
def __init__(self, *args: "Any", **kwargs: "Any") -> None:
super().__init__(*args, **kwargs)
self._pending_removed: set[T] = set()
self._pending_append: list[T] = []
@classmethod
def coerce(cls, key: "Any", value: "Any") -> "Any": # pragma: no cover
if not isinstance(value, MutableList):
if isinstance(value, list):
return MutableList[T](value)
# this call will raise ValueError
return Mutable.coerce(key, value)
return cast("MutableList[T]", value)
@no_type_check
def __reduce_ex__(self, proto: int) -> "tuple[type[MutableList[T]], tuple[list[T]]]": # pragma: no cover
return self.__class__, (list(self),)
# needed for backwards compatibility with
# older pickles
def __getstate__(self) -> "tuple[list[T], set[T]]": # pragma: no cover
return list(self), self._pending_removed
def __setstate__(self, state: "Any") -> None: # pragma: no cover
self[:] = state[0]
self._pending_removed = state[1]
def __setitem__(self, index: "Any", value: "Any") -> None:
"""Detect list set events and emit change events."""
old_value = self[index] if isinstance(index, slice) else [self[index]]
list.__setitem__(self, index, value) # pyright: ignore[reportUnknownMemberType,reportUnknownArgumentType]
self.changed()
self._pending_removed.update(old_value) # pyright: ignore[reportArgumentType]
def __delitem__(self, index: "Any") -> None:
"""Detect list del events and emit change events."""
old_value = self[index] if isinstance(index, slice) else [self[index]]
list.__delitem__(self, index) # pyright: ignore[reportUnknownMemberType,reportUnknownArgumentType]
self.changed()
self._pending_removed.update(old_value) # pyright: ignore[reportArgumentType]
def pop(self, *arg: "Any") -> "T":
result = list.pop(self, *arg) # pyright: ignore[reportUnknownMemberType,reportUnknownVariableType]
self.changed()
self._pending_removed.add(result) # pyright: ignore[reportArgumentType,reportUnknownArgumentType]
return result # pyright: ignore[reportUnknownVariableType]
def append(self, x: "Any") -> None:
list.append(self, x) # pyright: ignore[reportUnknownMemberType]
self._pending_append.append(x)
self.changed()
def extend(self, x: "Any") -> None:
list.extend(self, x) # pyright: ignore[reportUnknownMemberType]
self._pending_append.extend(x)
self.changed()
@no_type_check
def __iadd__(self, x: "Any") -> "Self":
self.extend(x)
return self
def insert(self, i: "Any", x: "Any") -> None:
list.insert(self, i, x) # pyright: ignore[reportUnknownMemberType]
self._pending_append.append(x)
self.changed()
def remove(self, i: "T") -> None:
list.remove(self, i) # pyright: ignore[reportUnknownMemberType]
self._pending_removed.add(i)
self.changed()
def clear(self) -> None:
self._pending_removed.update(self)
list.clear(self) # type: ignore[arg-type] # pyright: ignore[reportUnknownMemberType]
self.changed()
def sort(self, **kw: "Any") -> None:
list.sort(self, **kw) # pyright: ignore[reportUnknownMemberType]
self.changed()
def reverse(self) -> None:
list.reverse(self) # type: ignore[arg-type] # pyright: ignore[reportUnknownMemberType]
self.changed()
def _finalize_pending(self) -> None:
"""Finalize pending changes by clearing the pending append list."""
self._pending_append.clear()
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