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Fix repr for Fields that don't define default. (Cherry-pick of #18719) #18724

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Apr 13, 2023
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20 changes: 12 additions & 8 deletions src/python/pants/engine/target.py
Original file line number Diff line number Diff line change
Expand Up @@ -197,10 +197,10 @@ def _check_deprecated(cls, raw_value: Optional[Any], address: Address) -> None:
)

def __repr__(self) -> str:
return (
f"{self.__class__}(alias={repr(self.alias)}, value={repr(self.value)}, "
f"default={repr(self.default)})"
)
params = [f"alias={self.alias!r}", f"value={self.value!r}"]
if hasattr(self, "default"):
params.append(f"default={self.default!r}")
return f"{self.__class__}({', '.join(params)})"

def __str__(self) -> str:
return f"{self.alias}={self.value}"
Expand Down Expand Up @@ -269,10 +269,14 @@ def __init__(self, raw_value: Optional[Any], address: Address) -> None:
super().__init__(raw_value, address)

def __repr__(self) -> str:
return (
f"{self.__class__}(alias={repr(self.alias)}, address={self.address}, "
f"value={repr(self.value)}, default={repr(self.default)})"
)
params = [
f"alias={self.alias!r}",
f"address={self.address}",
f"value={self.value!r}",
]
if hasattr(self, "default"):
params.append(f"default={self.default!r}")
return f"{self.__class__}({', '.join(params)})"

def __hash__(self) -> int:
return hash((self.__class__, self.value, self.address))
Expand Down
4 changes: 3 additions & 1 deletion src/python/pants/engine/target_test.py
Original file line number Diff line number Diff line change
Expand Up @@ -400,7 +400,7 @@ class CustomFortranTarget(Target):


def test_required_field() -> None:
class RequiredField(StringField):
class RequiredField(Field):
alias = "field"
required = True

Expand All @@ -409,6 +409,8 @@ class RequiredTarget(Target):
core_fields = (RequiredField,)

address = Address("", target_name="lib")
# No errors getting the repr
assert repr(RequiredField("present", address))

# No errors when defined
RequiredTarget({"field": "present"}, address)
Expand Down