support empty array (#113)

datamodel_code_generator/model/pydantic/types.py

@@ -64,6 +64,7 @@
             Import(from_='typing', import_='Dict'),
         ],
     ),
+    Types.null: DataType(type='Any', imports_=[Import(from_='typing', import_='Any')]),
 }
 
 kwargs_schema_to_model = {

datamodel_code_generator/parser/jsonschema.py

@@ -59,6 +59,7 @@ def get_model_by_path(schema: Dict[str, Any], keys: List[str]) -> Dict:
     },
     'boolean': {'default': Types.boolean},
     'object': {'default': Types.object},
+    'null': {'default': Types.null},
 }
 
 
@@ -341,7 +342,7 @@ def parse_array_fields(
         if isinstance(obj.items, JsonSchemaObject):
             items: List[JsonSchemaObject] = [obj.items]
         else:
-            items = obj.items  # type: ignore
+            items = obj.items or []  # type: ignore
         item_obj_data_types: List[DataType] = []
         is_union: bool = False
         for item in items:

datamodel_code_generator/types.py

@@ -71,3 +71,4 @@ class Types(Enum):
     ipv6 = auto()
     boolean = auto()
     object = auto()
+    null = auto()

tests/data/jsonschema/person.json

@@ -16,6 +16,12 @@
       "description": "Age in years which must be equal to or greater than zero.",
       "type": "integer",
       "minimum": 0
+    },
+    "friends": {
+      "type": "array"
+    },
+    "comment": {
+      "type": "null"
     }
   }
 }

tests/test_main.py

@@ -319,7 +319,7 @@ def test_main_autodetect():
 
 from __future__ import annotations
 
-from typing import Optional
+from typing import Any, List, Optional
 
 from pydantic import BaseModel, Field, conint
 
@@ -330,6 +330,8 @@ class Person(BaseModel):
     age: Optional[conint(ge=0.0)] = Field(
         None, description='Age in years which must be equal to or greater than zero.'
     )
+    friends: Optional[List] = None
+    comment: Optional[Any] = None
 '''
         )
 
@@ -384,7 +386,7 @@ def test_main_jsonschema():
 
 from __future__ import annotations
 
-from typing import Optional
+from typing import Any, List, Optional
 
 from pydantic import BaseModel, Field, conint
 
@@ -395,6 +397,8 @@ class Person(BaseModel):
     age: Optional[conint(ge=0.0)] = Field(
         None, description='Age in years which must be equal to or greater than zero.'
     )
+    friends: Optional[List] = None
+    comment: Optional[Any] = None
 '''
         )
     with pytest.raises(SystemExit):