Move --strict-nullable from OpenAPI-only to Field customization (#2727)

* Move --strict-nullable from OpenAPI-only to Field customization

* docs: update CLI reference documentation

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---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: koxudaxi

docs/cli-reference/model-customization.md

@@ -20,7 +20,7 @@
 | [`--reuse-model`](#reuse-model) | Reuse identical model definitions instead of generating dupl... |
 | [`--reuse-scope`](#reuse-scope) | Scope for model reuse detection (root or tree). |
 | [`--skip-root-model`](#skip-root-model) | Skip generation of root model when schema contains nested de... |
-| [`--strict-nullable`](#strict-nullable) | Strictly handle nullable types in OpenAPI schemas. |
+| [`--strict-nullable`](#strict-nullable) | Treat default field as a non-nullable field. |
 | [`--strip-default-none`](#strip-default-none) | Remove fields with None as default value from generated mode... |
 | [`--target-python-version`](#target-python-version) | Target Python version for generated code syntax and imports.... |
 | [`--union-mode`](#union-mode) | Union mode for combining anyOf/oneOf schemas (smart or left_... |
@@ -4079,7 +4079,7 @@ object is just a container for $defs and not a meaningful model itself.
 
 ## `--strict-nullable` {#strict-nullable}
 
-Strictly handle nullable types in OpenAPI schemas.
+Treat default field as a non-nullable field.
 
 The `--strict-nullable` flag configures the code generation behavior.
 

docs/cli-reference/quick-reference.md

@@ -89,7 +89,7 @@ datamodel-codegen [OPTIONS]
 | [`--reuse-model`](model-customization.md#reuse-model) | Reuse identical model definitions instead of generating duplicates. |
 | [`--reuse-scope`](model-customization.md#reuse-scope) | Scope for model reuse detection (root or tree). |
 | [`--skip-root-model`](model-customization.md#skip-root-model) | Skip generation of root model when schema contains nested definitions. |
-| [`--strict-nullable`](model-customization.md#strict-nullable) | Strictly handle nullable types in OpenAPI schemas. |
+| [`--strict-nullable`](model-customization.md#strict-nullable) | Treat default field as a non-nullable field. |
 | [`--strip-default-none`](model-customization.md#strip-default-none) | Remove fields with None as default value from generated models. |
 | [`--target-python-version`](model-customization.md#target-python-version) | Target Python version for generated code syntax and imports. |
 | [`--union-mode`](model-customization.md#union-mode) | Union mode for combining anyOf/oneOf schemas (smart or left_to_right). |
@@ -241,7 +241,7 @@ All options sorted alphabetically:
 - [`--skip-root-model`](model-customization.md#skip-root-model) - Skip generation of root model when schema contains nested de...
 - [`--snake-case-field`](field-customization.md#snake-case-field) - Convert field names to snake_case format.
 - [`--special-field-name-prefix`](field-customization.md#special-field-name-prefix) - Prefix to add to special field names (like reserved keywords...
-- [`--strict-nullable`](model-customization.md#strict-nullable) - Strictly handle nullable types in OpenAPI schemas.
+- [`--strict-nullable`](model-customization.md#strict-nullable) - Treat default field as a non-nullable field.
 - [`--strict-types`](typing-customization.md#strict-types) - Enable strict type validation for specified Python types.
 - [`--strip-default-none`](model-customization.md#strip-default-none) - Remove fields with None as default value from generated mode...
 - [`--target-python-version`](model-customization.md#target-python-version) - Target Python version for generated code syntax and imports.

src/datamodel_code_generator/arguments.py

@@ -539,6 +539,12 @@ def start_section(self, heading: str | None) -> None:
     help="Set field name prefix when first character can't be used as Python field name (default:  `field`)",
     default=None,
 )
+field_options.add_argument(
+    "--strict-nullable",
+    help="Treat default field as a non-nullable field",
+    action="store_true",
+    default=None,
+)
 field_options.add_argument(
     "--strip-default-none",
     help="Strip default None on fields",
@@ -694,12 +700,6 @@ def start_section(self, heading: str | None) -> None:
     nargs="+",
     default=None,
 )
-openapi_options.add_argument(
-    "--strict-nullable",
-    help="Treat default field as a non-nullable field (Only OpenAPI)",
-    action="store_true",
-    default=None,
-)
 openapi_options.add_argument(
     "--use-operation-id-as-name",
     help="use operation id of OpenAPI as class names of models",

tests/main/openapi/test_main_openapi.py

@@ -1480,7 +1480,7 @@ def test_main_openapi_nullable(output_file: Path) -> None:
     golden_output="openapi/nullable_strict_nullable.py",
 )
 def test_main_openapi_nullable_strict_nullable(output_file: Path) -> None:
-    """Strictly handle nullable types in OpenAPI schemas.
+    """Treat default field as a non-nullable field.
 
     The `--strict-nullable` flag configures the code generation behavior.
     """