fix: Preserve class names when generating models from JSON Schema 202… (

#2185)

* fix: Preserve class names when generating models from JSON Schema 2020-12

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

datamodel_code_generator/reference.py

@@ -573,11 +573,13 @@ def add_ref(self, ref: str, resolved: bool = False) -> Reference:
         split_ref = ref.rsplit('/', 1)
         if len(split_ref) == 1:
             original_name = Path(
-                split_ref[0][:-1] if self.is_external_root_ref(path) else split_ref[0]
+                split_ref[0].rstrip('#')
+                if self.is_external_root_ref(path)
+                else split_ref[0]
             ).stem
         else:
             original_name = (
-                Path(split_ref[1][:-1]).stem
+                Path(split_ref[1].rstrip('#')).stem
                 if self.is_external_root_ref(path)
                 else split_ref[1]
             )

tests/test_reference.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from datamodel_code_generator.reference import get_relative_path
+from datamodel_code_generator.reference import ModelResolver, get_relative_path
 
 
 @pytest.mark.parametrize(
@@ -47,3 +47,23 @@ def test_get_relative_path_windows(
     assert PureWindowsPath(
         get_relative_path(PureWindowsPath(base_path), PureWindowsPath(target_path))
     ) == PureWindowsPath(expected)
+
+
+def test_model_resolver_add_ref_with_hash():
+    model_resolver = ModelResolver()
+    reference = model_resolver.add_ref(
+        'https://json-schema.org/draft/2020-12/meta/core#'
+    )
+    assert reference.original_name == 'core'
+
+
+def test_model_resolver_add_ref_without_hash():
+    model_resolver = ModelResolver()
+    reference = model_resolver.add_ref('meta/core')
+    assert reference.original_name == 'core'
+
+
+def test_model_resolver_add_ref_unevaluated():
+    model_resolver = ModelResolver()
+    reference = model_resolver.add_ref('meta/unevaluated')
+    assert reference.original_name == 'unevaluated'