Valid JSON Schema results in error due to `additionalProperties` set to `false`

[will-ockmore]

Describe the bug When running datamodel-codegen for any files that have additionalProperties set to false, the tool throws an exception. See the full debug output below:

        Modified var:.. key = 'additionalProperties'
        Modified var:.. model = False
        13:26:28.368505 line      1792                     obj = self.SCHEMA_OBJECT_TYPE.parse_obj(model)
        13:26:28.368662 exception 1792                     obj = self.SCHEMA_OBJECT_TYPE.parse_obj(model)
        Exception:..... pydantic_core._pydantic_core.ValidationError: 1 validation error for JsonSchemaObject
  Input should be a valid dictionary or instance of JsonSchemaObject [type=model_type, input_value=False, input_type=bool]
    For further information visit https://errors.pydantic.dev/2.8/v/model_type
        13:26:28.369075 line      1774             with self.root_id_context(raw):
        13:26:28.369175 line      1770         with self.model_resolver.current_root_context(path_parts):
        Call ended by exception
        Elapsed time: 00:00:00.009855
    13:26:28.369375 exception 1716             self._parse_file(self.raw_obj, obj_name, path_parts)
    Exception:..... pydantic_core._pydantic_core.ValidationError: 1 validation error for JsonSchemaObject
  Input should be a valid dictionary or instance of JsonSchemaObject [type=model_type, input_value=False, input_type=bool]
    For further information visit https://errors.pydantic.dev/2.8/v/model_type
    New var:....... self = <datamodel_code_generator.parser.jsonschema.JsonSchemaParser object at 0xffffbc9f1710>
    New var:....... source = Source(path=PosixPath('cancelSandboxAuthorization.json'), text='{\n  "$schema": "http://json-schema.org/draft-07/schema#",\n  "$id": "cancelSandboxAuthorization.json",\n  "definitions": {\n    "relationships": {\n      "type": "object",\n      "properties": {\n        "account": {\n          "type": "object",\n          "properties": {\n            "data": {\n              "type": "object",\n              "properties": {\n                "type": { "type": "string", "enum": ["depositAccount", "creditAccount"]},\n                "id": { "$ref": "types.json#/definitions/identifier" }\n              },\n              "required": [ "type", "id" ],\n              "additionalProperties": false\n            }\n          },\n          "required": [ "data" ],\n          "additionalProperties": false\n        }\n      },\n      "required": [ "account" ],\n      "additionalProperties": false\n    },\n    "authorization": {\n      "title": "Cancel Simulated Authorization",\n      "type": "object",\n      "properties": {\n        "type": { "type": "string", "const": "authorization" },\n        "relationships": { "$ref": "#/definitions/relationships" }\n      },\n      "additionalProperties": false,\n      "required": [\n        "relationships"\n      ]\n    },\n    "additionalProperties": false\n  },\n\n  "title": "Cancel Simulated Authorization",\n  "type": "object",\n  "properties": {\n    "data": { "$ref": "#/definitions/authorization" }\n  },\n  "additionalProperties": false,\n  "required": [ "data" ]\n}')
    New var:....... path_parts = ['cancelSandboxAuthorization.json']
    13:26:28.369428 exception 1699                 yield source, path_parts
    Exception:..... GeneratorExit
    13:26:28.369499 line      1696             with self.model_resolver.current_base_path_context(
    13:26:28.369529 line      1696             with self.model_resolver.current_base_path_context(
    13:26:28.369589 return    1699                 yield source, path_parts
    Return value:.. None
Call ended by exception
Elapsed time: 00:00:53.387576
13:26:28.369662 exception 1236         self.parse_raw()
Exception:..... pydantic_core._pydantic_core.ValidationError: 1 validation error for JsonSchemaObject
  Input should be a valid dictionary or instance of JsonSchemaObject [type=model_type, input_value=False, input_type=bool]
    For further information visit https://errors.pydantic.dev/2.8/v/model_type
Call ended by exception
Elapsed time: 00:00:53.387761
Traceback (most recent call last):
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/datamodel_code_generator/__main__.py", line 449, in main
    generate(
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/datamodel_code_generator/__init__.py", line 473, in generate
    results = parser.parse()
              ^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/pysnooper/tracer.py", line 310, in simple_wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/datamodel_code_generator/parser/base.py", line 1236, in parse
    self.parse_raw()
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/pysnooper/tracer.py", line 310, in simple_wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1716, in parse_raw
    self._parse_file(self.raw_obj, obj_name, path_parts)
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/pysnooper/tracer.py", line 310, in simple_wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/datamodel_code_generator/parser/jsonschema.py", line 1792, in _parse_file
    obj = self.SCHEMA_OBJECT_TYPE.parse_obj(model)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/pydantic/main.py", line 1135, in parse_obj
    return cls.model_validate(obj)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/banking-core/.venv/lib/python3.11/site-packages/pydantic/main.py", line 568, in model_validate
    return cls.__pydantic_validator__.validate_python(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 1 validation error for JsonSchemaObject
  Input should be a valid dictionary or instance of JsonSchemaObject [type=model_type, input_value=False, input_type=bool]
    For further information visit https://errors.pydantic.dev/2.8/v/model_type

The above example is from running the command on a directory, which can be found at https://www.unit.co/docs/api/#json-schema

The command used in this case:

datamodel-codegen --input json-schemas --input-file-type jsonschema --output my-schemas --output-model-type pydantic_v2.BaseModel

Simplified command provided below.

To Reproduce

Example schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "cancelSandboxAuthorization.json",
  "definitions": {
    "relationships": {
      "type": "object",
      "properties": {
        "account": {
          "type": "object",
          "properties": {
            "data": {
              "type": "object",
              "properties": {
                "type": { "type": "string", "enum": ["depositAccount", "creditAccount"]},
                "id": { "$ref": "types.json#/definitions/identifier" }
              },
              "required": [ "type", "id" ],
              "additionalProperties": false
            }
          },
          "required": [ "data" ],
          "additionalProperties": false
        }
      },
      "required": [ "account" ],
      "additionalProperties": false
    },
    "authorization": {
      "title": "Cancel Simulated Authorization",
      "type": "object",
      "properties": {
        "type": { "type": "string", "const": "authorization" },
        "relationships": { "$ref": "#/definitions/relationships" }
      },
      "additionalProperties": false,
      "required": [
        "relationships"
      ]
    },
    "additionalProperties": false
  },

  "title": "Cancel Simulated Authorization",
  "type": "object",
  "properties": {
    "data": { "$ref": "#/definitions/authorization" }
  },
  "additionalProperties": false,
  "required": [ "data" ]
}

Used commandline:

$ datamodel-codegen --input json-schemas/cancelSandboxAuthorization.json

Expected behavior As described in the JSON Schema documentation, it's valid for additionalProperties to be set as false, and this should not cause an error.

Version:

• OS: ❯ uname -a Linux a59643f8c93b 6.6.32-linuxkit #1 SMP Thu Jun 13 14:13:01 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux
• Python version: 3.11.9
• datamodel-code-generator version: 0.25.8