Do not generate readOnly outside Schema properties

src/drf_yasg/inspectors/base.py

@@ -182,7 +182,7 @@ class FieldInspector(BaseInspector):
 
             - arguments specified by the ``kwargs`` parameter of :meth:`._get_partial_types`
             - ``instance_kwargs`` passed to the constructor function
-            - ``title``, ``description``, ``required``, ``default`` and ``read_only`` inferred from the field,
+            - ``title``, ``description``, ``required`` and ``default`` inferred from the field,
               where appropriate
 
           If ``existing_object`` is not ``None``, it is updated instead of creating a new object.
@@ -233,11 +233,6 @@ class FieldInspector(BaseInspector):
                     if default is not None:
                         instance_kwargs['default'] = default
 
-            if 'read_only' not in instance_kwargs and swagger_object_type == openapi.Schema:
-                # TODO: read_only is only relevant for schema `properties` - should not be generated in other cases
-                if field.read_only:
-                    instance_kwargs['read_only'] = True
-
             instance_kwargs.setdefault('title', title)
             instance_kwargs.setdefault('description', description)
             instance_kwargs.update(kwargs)

src/drf_yasg/inspectors/field.py

@@ -63,11 +63,18 @@ class InlineSerializerInspector(SerializerInspector):
             def make_schema_definition():
                 properties = OrderedDict()
                 required = []
-                for key, value in serializer.fields.items():
-                    key = self.get_property_name(key)
-                    properties[key] = self.probe_field_inspectors(value, ChildSwaggerType, use_references)
-                    if value.required:
-                        required.append(key)
+                for property_name, child in serializer.fields.items():
+                    property_name = self.get_property_name(property_name)
+                    prop_kwargs = {
+                        'read_only': child.read_only or None
+                    }
+                    prop_kwargs = filter_none(prop_kwargs)
+
+                    properties[property_name] = self.probe_field_inspectors(
+                        child, ChildSwaggerType, use_references, **prop_kwargs
+                    )
+                    if child.required:
+                        required.append(property_name)
 
                 return SwaggerType(
                     type=openapi.TYPE_OBJECT,

tests/reference.yaml

@@ -1110,7 +1110,6 @@ definitions:
           format: slug
           pattern: ^[-a-zA-Z0-9_]+$
         readOnly: true
-        readOnly: true
         uniqueItems: true
 securityDefinitions:
   basic: