code: def test_json_schema_flat_model_pydantic_v2():
      assert FlatModel.model_json_schema() == {
          "title": "FlatModel",
          "type": "object",
          "properties": {
              "id": {"title": "Id", "type": "string", "format": "uuid"},
              "enum_field": {"$ref": "#/$defs/MyEnum1"},
          },
          "required": ["id", "enum_field"],
          "$defs": {
              "MyEnum1": {
                  "enum": ["A", "B"],
                  "title": "MyEnum1",
                  "type": "string",
              }
          },
      }
  
imports: import enum
  import uuid
  from sqlalchemy import create_mock_engine
  from sqlalchemy.sql.type_api import TypeEngine
  from sqlmodel import Field, SQLModel
  from .conftest import needs_pydanticv1, needs_pydanticv2
label_desc: Use image node_id 7 for calling a global function with example usage: test_json_schema_flat_model_pydantic_v2() without return types