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github.com/pydantic/pydantic/pull/9237/files
pydantic/pydantic

Add compare_as support for custom field equality #9237

Opensamuelcolvin wants to merge 3 commits into main from feature/compare-as
Conversation12
Commits3
Checks2
Files changed4
+32-2
Filter changed files
pydantic
fields.py
pydantic/_internal
_generate_schema.py
pydantic-core
core_schema.pyi
tests
test_main.py
pydantic/fields.py
+11
……@@ changes @@
8888 class FieldInfo:
8989 """This class holds information about a field."""
9090
91+ compare_as: Callable[[Any, Any], bool] | None = None
92+
93+ def get_comparable(self, value) -> FieldComparable | Any:
94+ if self.compare_as is not None:
95+ return FieldComparable(value, self.compare_as)
96+ return value
9197
98+class FieldComparable:
99+ """Wrapper for custom field comparison"""
100+ def __init__(self, value, compare_as):
101+ self.value = value
102+ self.compare_as = compare_as
pydantic/_internal/_generate_schema.py
+7-2
……@@ changes @@
18421842 class GenerateSchema:
1843- def _generate_td_field_schema(self, ...):
1844- return core_schema.typed_dict_field(schema)
1843+ def _generate_td_field_schema(
1844+ self, name: str, field_info: FieldInfo,
1845+ ) -> core_schema.TypedDictField:
1846+ schema = self._common_field(field_info)
1847+ if field_info.compare_as is not None:
1848+ schema['compare_as'] = field_info.compare_as
1849+ return core_schema.typed_dict_field(schema)
pydantic-core/core_schema.pyi
+2
……@@ changes @@
320320 def typed_dict_field(
321321 schema: CoreSchema,
322+ compare_as: Callable[..., Any] | None = None,
322323 *,
323324 required: bool | None = None,
340341 def dataclass_field(
341342 schema: CoreSchema,
343+ compare_as: Callable[..., Any] | None = None,
342344 *,
tests/test_main.py
+12
……@@ changes @@
1+import pytest
2+from pydantic import BaseModel, Field
3+
4+def test_eq_binary_compare_as():
5+ class MyModel(BaseModel):
6+ name: str = Field(compare_as=lambda a,b: a.lower()==b.lower())
7+
8+ assert MyModel(name="Alice")==MyModel(name="ALICE")
9+
10+def test_eq_unary_compare_as():
11+ class MyModel(BaseModel):
12+ name: str = Field(compare_as=str.lower)
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Focused file:All changed files
pydantic_internalpydantic-core.python.pydantic_coretests«synthetic»fields [+7 -7](...)Field(...) : _TField(...) : _TField(...) : AnyField(...) : _TField(...) : AnyField(...) : AnyField(...) : AnyField(...) : AnyField(...) : AnyField(...) : AnyField(...) : AnyField(...) : AnyField(...) : _TField(...) : AnyFieldInfo [+2 +1](...)This class holds information about a field.FieldInfois used for any fielddefinition regardless of whether the [Field[]][pydantic.fields.Field] functionis explicitly used. !!! warning TheFieldInfoclass is meant to exposeinformation about a field in a Pydantic model or dataclass.FieldInfoinstances shouldn't be instantiated directly, nor mutated. If you need to derivea new model from another one and are willing to alterFieldInfoinstances,refer to this [dynamic model example][../examples/dynamic_models.md].Attributes: annotation: The type annotation of the field. default: The default**value of the field. default_factory: A callable to genera... compare_as : Callable[[Any, Any], bool] | Callable[[Any], Any] | Noneget_comparable(value: Any) : FieldComparable | Any_FromFieldInfoInputs [+1](...)This class exists solely to add type checking for thekwargsinFieldInfo.from_field. compare_as : Callable[[Any, Any], bool] | Callable[[Any], Any] | NoneFieldComparable [+4]Wrapper for supporting custom field comparison compare_as : Anyvalue : Any__eq__(other: Any) : bool«synthetic»_generate_schema(...)GenerateSchema [+3](...)Generate core schema for a Pydantic model, dataclass and types likestr,datetime, ... . _generate_td_field_schema(...) : core_schema.TypedDictField_generate_dc_field_schema(...) : core_schema.DataclassField_generate_md_field_schema(...) : core_schema.ModelField«synthetic»core_schema [+3 -3](...)typed_dict_field(...) : TypedDictFieldmodel_field(...) : ModelFielddataclass_field(...) : DataclassFielddataclass_field(...) : DataclassFieldmodel_field(...) : ModelFieldtyped_dict_field(...) : TypedDictField«synthetic»test_main [+4](...)test_exclude_default_binary_compare_as() : Anytest_eq_unary_compare_as() : Anytest_exclude_default_unary_compare_as() : Anytest_eq_binary_compare_as() : Any