Support RecursiveField with 'many' option (#321)

src/drf_yasg/inspectors/field.py

@@ -794,10 +794,19 @@ def field_to_swagger_object(self, field, swagger_object_type, use_references, **
             if isinstance(field, RecursiveField) and swagger_object_type == openapi.Schema:
                 assert use_references is True, "Can not create schema for RecursiveField when use_references is False"
 
-                ref_name = get_serializer_ref_name(field.proxied)
-                assert ref_name is not None, "Can't create RecursiveField schema for inline " + str(type(field.proxied))
+                proxied = field.proxied
+                if isinstance(field.proxied, serializers.ListSerializer):
+                    proxied = proxied.child
+
+                ref_name = get_serializer_ref_name(proxied)
+                assert ref_name is not None, "Can't create RecursiveField schema for inline " + str(type(proxied))
 
                 definitions = self.components.with_scope(openapi.SCHEMA_DEFINITIONS)
-                return openapi.SchemaRef(definitions, ref_name, ignore_unresolved=True)
+
+                ref = openapi.SchemaRef(definitions, ref_name, ignore_unresolved=True)
+                if isinstance(field.proxied, serializers.ListSerializer):
+                    ref = openapi.Items(type=openapi.TYPE_ARRAY, items=ref)
+
+                return ref
 
             return NotHandled

testproj/todo/serializer.py

@@ -41,10 +41,11 @@ class Meta:
 
 class TodoTreeSerializer(serializers.ModelSerializer):
     children = serializers.ListField(child=RecursiveField(), source='children.all')
+    many_children = RecursiveField(many=True, source='children')
 
     class Meta:
         model = TodoTree
-        fields = ('id', 'title', 'children')
+        fields = ('id', 'title', 'children', 'many_children')
 
 
 class TodoRecursiveSerializer(serializers.ModelSerializer):

tests/reference.yaml

@@ -1617,6 +1617,7 @@ definitions:
     required:
       - title
       - children
+      - many_children
     type: object
     properties:
       id:
@@ -1632,6 +1633,10 @@ definitions:
         type: array
         items:
           $ref: '#/definitions/TodoTree'
+      many_children:
+        type: array
+        items:
+          $ref: '#/definitions/TodoTree'
   TodoYetAnother:
     required:
       - title