Support aliases in get_specialized_type_var_map

[alexey-pelykh]

Description

Support aliases (TypeVar passthrough) in get_specialized_type_var_map:

def test_get_specialized_type_var_map_double_generic_passthrough():
    @strawberry.type
    class Foo(Generic[_T]): ...

    @strawberry.type
    class Bar(Foo[_K], Generic[_K]): ...

    @strawberry.type
    class Bin(Bar[int]): ...

    assert get_specialized_type_var_map(Bin) == {
        "_T": int,
        "_K": int,
    }

Without this change, errors like

KeyError: '_T'

will appear

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Support TypeVar passthrough in get_specialized_type_var_map.

Enhancements:

• Resolve type variables correctly when a generic type inherits from another generic type, passing the type variable through.

Tests:

• Add a test case for TypeVar passthrough with double generics.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces support for TypeVar passthrough in get_specialized_type_var_map. This allows the function to correctly resolve type variables when dealing with complex inheritance scenarios involving generic types.

Class diagram showing generic type inheritance example

classDiagram
    class Foo~T~{
        +Generic[T]
    }
    class Bar~K~{
        +Generic[K]
    }
    class Bin{
    }
    Foo <|-- Bar: Foo[K]
    Bar <|-- Bin: Bar[int]
    note for Bin "Resolves type variables:
_T = int
_K = int"

Loading

File-Level Changes

Change	Details	Files
Implemented TypeVar passthrough in get_specialized_type_var_map.	Modified the function to traverse the class hierarchy and collect type parameters. Added logic to resolve type variables passed through generic aliases. Updated the function to use an OrderedDict to preserve the order of type parameters. Added a loop to resolve type variables that are aliases of other type variables.	strawberry/utils/inspect.py
Added a new test case to verify the TypeVar passthrough functionality.	Created a new test case test_get_specialized_type_var_map_double_generic_passthrough. Added a new test case that uses a double generic passthrough to verify the fix.	tests/python_312/test_inspect.py tests/utils/test_inspect.py
Added a release note for the new feature.	Added a release note to the RELEASE.md file.	RELEASE.md

---

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[sourcery-ai]

Hey @alexey-pelykh - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding inline documentation for the type variable resolution loop to explain the algorithm for future maintainers.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

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[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

Support aliases (TypeVar passthrough) in get_specialized_type_var_map.

Here's the tweet text:

🆕 Release (next) is out! Thanks to @alexey_pelykh for the PR 👏

Get it here 👉 https://strawberry.rocks/release/(next)

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.24%. Comparing base (7ba5928) to head (4934eb5).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3766      +/-   ##
==========================================
- Coverage   97.27%   97.24%   -0.03%     
==========================================
  Files         504      502       -2     
  Lines       33480    33481       +1     
  Branches     5502     1714    -3788     
==========================================
- Hits        32566    32558       -8     
- Misses        703      706       +3     
- Partials      211      217       +6     

[codspeed-hq]

CodSpeed Performance Report

Merging #3766 will not alter performance

_{Comparing alexey-pelykh:imp/get_specialized_type_var_map-double-generic-passthrough (4934eb5) with main (3c0f9e4)}

Summary

✅ 21 untouched benchmarks

[alexey-pelykh]

get_args lives in typing since Python 3.8

[bellini666]

Just one small adjustment and it should be good to go! 😊