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import, pydantic, class, file, python, line, generic, targett, issue, genericmodel, union, type, commented, thenx, sourcet, typing, int, annotations, dmontagu, syntax, bug, types, typevar, genericsourcet, typeerror, typevarsmap, origintype, sign, version, added, models, relationships, return, concretetype, subscriptable, typesuniontype, source, typevars, working, bidirectionalmultirelationshipgenericmodel, relationshiptargett, bidirectionalmultirelationshipstr, traceback, recent, call, input, locallibpythonsitepackagespydanticgenericspy, preparemodelfieldscreatedmodel, fields, instancetypehints,

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10/site-packages/pydantic/generics /usr/local/lib/python3 local/lib/python3 list[union[relationship[sourcet venv/lib/python3 dum-dum approach __future__ import annotations unsupported operand type dmontagu edits contributor typing import union evaluate list[str] list[str] % python3 comment metadata assignees typing import generic union[list[datat] thenx edits added syntax mygenericmodel[int] results list[relationship[sourcet import pydantic pydantic v1 bidirectionalmultirelationship model 8/lib/python3 search / pydantic models pydantic version 11 class bidirectionalmultirelationship code runs str typeerror class mygenericmodel pydantic/typing targett = typevar list[datat] list[str] newer python generic[sourcet generic[datat] class relationship woodruffw mentioned issue closed existing issue original issue generic models relationship[sourcet 'type' object type projects source 'typing-extensions'] pydantic/main relationship genericmodel

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DiscussionForumPosting:
      context:https://schema.org
      headline:X | Y union syntax breaks GenericModel
      articleBody:# Bug Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`: ``` pydantic version: 1.9.1 pydantic compiled: True install path: /home/paystone/.local/lib/python3.10/site-packages/pydantic python version: 3.10.2 (main, Jan 29 2022, 02:55:36) [GCC 10.2.1 20210110] platform: Linux-5.18.2-arch1-1-x86_64-with-glibc2.31 optional deps. installed: ['typing-extensions'] ``` Python 3.10 incorporated [PEP 604](https://peps.python.org/pep-0604/), which added syntax for writing Unions as `X | Y`, instead of `typing.Union[X, Y]`. It seems that when this syntax is used in combination with TypeVars as part of a `GenericModel`, the binding of TypeVars to their types fails. Below is first a working example using `typing.Union`, followed by a non-working example using `|` syntax, with the stack trace. The example seeks to construct a `Relationship` GenericModel, and a `BidirectionalMultiRelationship` model which contains a list of either `Relationship[A, B]` or `Relationship[B, A]` models: ```py from typing import Union, Generic, TypeVar from pydantic.generics import GenericModel SourceT = TypeVar("SourceT") TargetT = TypeVar("TargetT") class Relationship(GenericModel, Generic[SourceT, TargetT]): source: SourceT target: TargetT class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): relationships: list[Union[Relationship[SourceT, TargetT], Relationship[TargetT, SourceT]]] BidirectionalMultiRelationship[str, int] ``` ```py from typing import Generic, TypeVar from pydantic.generics import GenericModel SourceT = TypeVar("SourceT") TargetT = TypeVar("TargetT") class Relationship(GenericModel, Generic[SourceT, TargetT]): source: SourceT target: TargetT class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): relationships: list[Relationship[SourceT, TargetT] | Relationship[TargetT, SourceT]] BidirectionalMultiRelationship[str, int] ``` ``` --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Input In [2], in <cell line: 14>() 11 class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): 12 relationships: Relationship[SourceT, TargetT] | Relationship[TargetT, SourceT] ---> 14 BidirectionalMultiRelationship[str, int] File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:137, in GenericModel.__class_getitem__(cls, params) 133 _generic_types_cache[(cls, params[0])] = created_model 135 # Recursively walk class type hints and replace generic typevars 136 # with concrete types that were passed. --> 137 _prepare_model_fields(created_model, fields, instance_type_hints, typevars_map) 139 return created_model File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:356, in _prepare_model_fields(created_model, fields, instance_type_hints, typevars_map) 353 assert field.type_.__class__ is DeferredType, field.type_.__class__ 355 field_type_hint = instance_type_hints[key] --> 356 concrete_type = replace_types(field_type_hint, typevars_map) 357 field.type_ = concrete_type 358 field.outer_type_ = concrete_type File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:263, in replace_types(type_, type_map) 261 origin_type = getattr(typing, type_._name) 262 assert origin_type is not None --> 263 return origin_type[resolved_type_args] 265 # We handle pydantic generic models separately as they don't have the same 266 # semantics as "typing" classes or generic aliases 267 if not origin_type and lenient_issubclass(type_, GenericModel) and not type_.__concrete__: TypeError: 'type' object is not subscriptable ``` On inspection I found that at the point that the exception is thrown, `origin_type` is `types.UnionType`, where it should be `Relationship`. Apologies if I missed an existing issue for this. I couldn't find anything in my search.
      author:
         url:https://github.com/squarebridges
         type:Person
         name:squarebridges
      datePublished:2022-06-09T22:27:42.000Z
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      url:https://github.com/4146/pydantic/issues/4146
      context:https://schema.org
      headline:X | Y union syntax breaks GenericModel
      articleBody:# Bug Output of `python -c "import pydantic.utils; print(pydantic.utils.version_info())"`: ``` pydantic version: 1.9.1 pydantic compiled: True install path: /home/paystone/.local/lib/python3.10/site-packages/pydantic python version: 3.10.2 (main, Jan 29 2022, 02:55:36) [GCC 10.2.1 20210110] platform: Linux-5.18.2-arch1-1-x86_64-with-glibc2.31 optional deps. installed: ['typing-extensions'] ``` Python 3.10 incorporated [PEP 604](https://peps.python.org/pep-0604/), which added syntax for writing Unions as `X | Y`, instead of `typing.Union[X, Y]`. It seems that when this syntax is used in combination with TypeVars as part of a `GenericModel`, the binding of TypeVars to their types fails. Below is first a working example using `typing.Union`, followed by a non-working example using `|` syntax, with the stack trace. The example seeks to construct a `Relationship` GenericModel, and a `BidirectionalMultiRelationship` model which contains a list of either `Relationship[A, B]` or `Relationship[B, A]` models: ```py from typing import Union, Generic, TypeVar from pydantic.generics import GenericModel SourceT = TypeVar("SourceT") TargetT = TypeVar("TargetT") class Relationship(GenericModel, Generic[SourceT, TargetT]): source: SourceT target: TargetT class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): relationships: list[Union[Relationship[SourceT, TargetT], Relationship[TargetT, SourceT]]] BidirectionalMultiRelationship[str, int] ``` ```py from typing import Generic, TypeVar from pydantic.generics import GenericModel SourceT = TypeVar("SourceT") TargetT = TypeVar("TargetT") class Relationship(GenericModel, Generic[SourceT, TargetT]): source: SourceT target: TargetT class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): relationships: list[Relationship[SourceT, TargetT] | Relationship[TargetT, SourceT]] BidirectionalMultiRelationship[str, int] ``` ``` --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Input In [2], in <cell line: 14>() 11 class BidirectionalMultiRelationship(GenericModel, Generic[SourceT, TargetT]): 12 relationships: Relationship[SourceT, TargetT] | Relationship[TargetT, SourceT] ---> 14 BidirectionalMultiRelationship[str, int] File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:137, in GenericModel.__class_getitem__(cls, params) 133 _generic_types_cache[(cls, params[0])] = created_model 135 # Recursively walk class type hints and replace generic typevars 136 # with concrete types that were passed. --> 137 _prepare_model_fields(created_model, fields, instance_type_hints, typevars_map) 139 return created_model File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:356, in _prepare_model_fields(created_model, fields, instance_type_hints, typevars_map) 353 assert field.type_.__class__ is DeferredType, field.type_.__class__ 355 field_type_hint = instance_type_hints[key] --> 356 concrete_type = replace_types(field_type_hint, typevars_map) 357 field.type_ = concrete_type 358 field.outer_type_ = concrete_type File ~/.local/lib/python3.10/site-packages/pydantic/generics.py:263, in replace_types(type_, type_map) 261 origin_type = getattr(typing, type_._name) 262 assert origin_type is not None --> 263 return origin_type[resolved_type_args] 265 # We handle pydantic generic models separately as they don't have the same 266 # semantics as "typing" classes or generic aliases 267 if not origin_type and lenient_issubclass(type_, GenericModel) and not type_.__concrete__: TypeError: 'type' object is not subscriptable ``` On inspection I found that at the point that the exception is thrown, `origin_type` is `types.UnionType`, where it should be `Relationship`. Apologies if I missed an existing issue for this. I couldn't find anything in my search.
      author:
         url:https://github.com/squarebridges
         type:Person
         name:squarebridges
      datePublished:2022-06-09T22:27:42.000Z
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      url:https://github.com/4146/pydantic/issues/4146
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      url:https://github.com/squarebridges
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