Fix import alias if two types are provided (Json schema) (#2611)

Author: Killian-fal

src/datamodel_code_generator/parser/base.py

@@ -1583,19 +1583,17 @@ def __alias_shadowed_imports(  # noqa: PLR6301
     ) -> None:
         for model in models:
             for model_field in model.fields:
-                if (
-                    model_field.data_type.type in all_model_field_names
-                    and model_field.data_type.type == model_field.name
-                ):
-                    alias = model_field.data_type.type + "_aliased"
-                    model_field.data_type.type = alias
-                    if model_field.data_type.import_:  # pragma: no cover
-                        model_field.data_type.import_ = Import(
-                            from_=model_field.data_type.import_.from_,
-                            import_=model_field.data_type.import_.import_,
-                            alias=alias,
-                            reference_path=model_field.data_type.import_.reference_path,
-                        )
+                for data_type in model_field.data_type.all_data_types:
+                    if data_type and data_type.type in all_model_field_names and data_type.type == model_field.name:
+                        alias = data_type.type + "_aliased"
+                        data_type.type = alias
+                        if data_type.import_:  # pragma: no cover
+                            data_type.import_ = Import(
+                                from_=data_type.import_.from_,
+                                import_=data_type.import_.import_,
+                                alias=alias,
+                                reference_path=data_type.import_.reference_path,
+                            )
 
     @classmethod
     def _collect_exports_for_init(

tests/data/expected/main/jsonschema/alias_import_alias/date_schema.py

@@ -0,0 +1,16 @@
+# generated by datamodel-codegen:
+#   filename:  date.schema.json
+#   timestamp: 2019-07-26T00:00:00+00:00
+
+from __future__ import annotations
+
+from datetime import date as date_aliased
+from datetime import datetime as datetime_aliased
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class TypeDate(BaseModel):
+    date: Optional[date_aliased]
+    datetime: Optional[datetime_aliased] = None

tests/data/jsonschema/alias_import_alias/date.schema.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "TypeDate",
+  "type": "object",
+  "properties": {
+    "date": { "type": ["string", "null"], "format": "date"},
+    "datetime": { "type": ["string", "null"], "format": "date-time"}
+  },
+  "required": ["date"]
+}