Do not generate form parameters for read_only serializer fields

Fixes #261.

src/drf_yasg/inspectors/field.py

@@ -58,6 +58,7 @@ def get_request_parameters(self, serializer, in_):
             )
             for key, value
             in fields.items()
+            if not getattr(value, 'read_only', False)
         ]
 
         return self.add_manual_parameters(serializer, parameters)

src/drf_yasg/inspectors/view.py

@@ -6,13 +6,13 @@
 from rest_framework.schemas import AutoSchema
 from rest_framework.status import is_success
 
-from .base import ViewInspector
 from .. import openapi
 from ..errors import SwaggerGenerationError
 from ..utils import (
     filter_none, force_real_str, force_serializer_instance, get_consumes, get_produces, guess_response_status,
     is_list_view, merge_params, no_body, param_list_to_odict
 )
+from .base import ViewInspector
 
 log = logging.getLogger(__name__)
 

testproj/articles/serializers.py

@@ -33,6 +33,7 @@ class Meta:
 
 
 class ImageUploadSerializer(serializers.Serializer):
+    image_id = serializers.UUIDField(read_only=True)
     what_am_i_doing = serializers.RegexField(
         regex=r"^69$",
         help_text="test",

tests/reference.yaml

@@ -913,6 +913,10 @@ definitions:
       - image_styles
     type: object
     properties:
+      image_id:
+        type: string
+        format: uuid
+        readOnly: true
       what_am_i_doing:
         description: test
         type: string