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Add hash to model with primary key #877

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Add hash to model with primary key #877

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15 changes: 15 additions & 0 deletions sqlmodel/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -735,6 +735,21 @@ def __repr_args__(self) -> Sequence[Tuple[Optional[str], Any]]:
if not (isinstance(k, str) and k.startswith("_sa_"))
]

def __hash__(self) -> int:
# If there's a primary key, use that to hash the object
to_hash = ""

for field in self.__fields__:
is_primary_key = getattr(
self.__fields__[field].field_info, "primary_key", False
)
if is_primary_key:
to_hash += str(getattr(self, field))
if not to_hash:
# Can't call super().__hash__ because BaseModel.__hash__ is a NoneType
raise TypeError(f"unhashable type: '{self.__class__.__name__}'")
return hash(to_hash)

@declared_attr # type: ignore
def __tablename__(cls) -> str:
return cls.__name__.lower()
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