Merge remote-tracking branch 'origin/main' into refactor/config-class

# Conflicts:
#	src/datamodel_code_generator/__main__.py
#	tests/test_input_model.py

Author: koxudaxi

docs/cli-reference/base-options.md

@@ -8,6 +8,7 @@
 | [`--input`](#input) | Specify the input schema file path. |
 | [`--input-file-type`](#input-file-type) | Specify the input file type for code generation. |
 | [`--input-model`](#input-model) | Import a Python type or dict schema from a module. |
+| [`--input-model-ref-strategy`](#input-model-ref-strategy) | Strategy for referenced types when using --input-model. |
 | [`--output`](#output) | Specify the destination path for generated Python code. |
 | [`--url`](#url) | Fetch schema from URL with custom HTTP headers. |
 
@@ -241,6 +242,30 @@ Use the format `module:Object` or `path/to/file.py:Object` to specify the type.
 
 ---
 
+## `--input-model-ref-strategy` {#input-model-ref-strategy}
+
+Strategy for referenced types when using --input-model.
+
+The `--input-model-ref-strategy` option determines whether to regenerate or import
+referenced types. Use `regenerate-all` (default) to regenerate all types,
+`reuse-foreign` to import types from different families (like enums when generating
+dataclasses) while regenerating same-family types, or `reuse-all` to import all
+referenced types directly.
+
+!!! tip "Usage"
+
+    ```bash
+    datamodel-codegen --input schema.json --input-model-ref-strategy reuse-foreign # (1)!
+    ```
+
+    1. :material-arrow-left: `--input-model-ref-strategy` - the option documented here
+
+??? example "Examples"
+
+    **Output:**
+
+---
+
 ## `--output` {#output}
 
 Specify the destination path for generated Python code.

docs/cli-reference/index.md

@@ -8,7 +8,7 @@ This documentation is auto-generated from test cases.
 
 | Category | Options | Description |
 |----------|---------|-------------|
-| 📁 [Base Options](base-options.md) | 6 | Input/output configuration |
+| 📁 [Base Options](base-options.md) | 7 | Input/output configuration |
 | 🔧 [Typing Customization](typing-customization.md) | 26 | Type annotation and import behavior |
 | 🏷️ [Field Customization](field-customization.md) | 22 | Field naming and docstring behavior |
 | 🏗️ [Model Customization](model-customization.md) | 36 | Model generation behavior |
@@ -107,6 +107,7 @@ This documentation is auto-generated from test cases.
 - [`--input`](base-options.md#input)
 - [`--input-file-type`](base-options.md#input-file-type)
 - [`--input-model`](base-options.md#input-model)
+- [`--input-model-ref-strategy`](base-options.md#input-model-ref-strategy)
 
 ### K {#k}
 

docs/cli-reference/quick-reference.md

@@ -20,6 +20,7 @@ datamodel-codegen [OPTIONS]
 | [`--input`](base-options.md#input) | Specify the input schema file path. |
 | [`--input-file-type`](base-options.md#input-file-type) | Specify the input file type for code generation. |
 | [`--input-model`](base-options.md#input-model) | Import a Python type or dict schema from a module. |
+| [`--input-model-ref-strategy`](base-options.md#input-model-ref-strategy) | Strategy for referenced types when using --input-model. |
 | [`--output`](base-options.md#output) | Specify the destination path for generated Python code. |
 | [`--url`](base-options.md#url) | Fetch schema from URL with custom HTTP headers. |
 
@@ -252,6 +253,7 @@ All options sorted alphabetically:
 - [`--input`](base-options.md#input) - Specify the input schema file path.
 - [`--input-file-type`](base-options.md#input-file-type) - Specify the input file type for code generation.
 - [`--input-model`](base-options.md#input-model) - Import a Python type or dict schema from a module.
+- [`--input-model-ref-strategy`](base-options.md#input-model-ref-strategy) - Strategy for referenced types when using --input-model.
 - [`--keep-model-order`](model-customization.md#keep-model-order) - Keep model definition order as specified in schema.
 - [`--keyword-only`](model-customization.md#keyword-only) - Generate dataclasses with keyword-only fields (Python 3.10+)...
 - [`--model-extra-keys`](model-customization.md#model-extra-keys) - Add model-level schema extensions to ConfigDict json_schema_...

src/datamodel_code_generator/__init__.py

@@ -39,6 +39,7 @@
     FieldTypeCollisionStrategy,
     GraphQLScope,
     InputFileType,
+    InputModelRefStrategy,
     ModuleSplitMode,
     NamingStrategy,
     OpenAPIScope,
@@ -1241,6 +1242,7 @@ def infer_input_type(text: str) -> InputFileType:
     "Error",
     "GeneratedModules",
     "InputFileType",
+    "InputModelRefStrategy",
     "InvalidClassNameError",
     "InvalidFileFormatError",
     "LiteralType",