django-import-export / django-import-export / 24130603793

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Loading format libraries now checks `IMPORT_EXPORT_FORMATS` to improve performance (#2156)

* Add failing tests for get_default_formats() and get_binary_formats()

Tests for lazy format functions that will replace module-level
DEFAULT_FORMATS and BINARY_FORMATS constants. All 6 tests currently
fail with AttributeError since the functions don't exist yet.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Implement get_default_formats() and get_binary_formats() with lru_cache

Replace module-level DEFAULT_FORMATS and BINARY_FORMATS constants with
cached functions that respect the IMPORT_EXPORT_FORMATS setting. Add
_LazyFormatList wrapper for backward compatibility with existing imports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: replace DEFAULT_FORMATS/BINARY_FORMATS with lazy functions

Adds get_default_formats() and get_binary_formats() that evaluate lazily
on first call, respecting IMPORT_EXPORT_FORMATS setting and avoiding
expensive library imports at module load time.

Fixes #2149

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update test references from DEFAULT_FORMATS to get_default_formats()

Replace removed DEFAULT_FORMATS constant with get_default_formats()
function call in test mixin files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update call sites to use get_default_formats() and get_binary_formats()

Replace references to removed DEFAULT_FORMATS and BINARY_FORMATS
constants in mixins.py, admin.py, and command_utils.py with calls to
the new lazy functions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: clear lru_cache in setUp to ensure test isolation

Other tests in the suite may populate the format caches before these
test classes run. Clearing in both setUp and tearDown ensures each test
starts with a fresh cache.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add cha... (continued)

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