diff --git a/docs/changelog.rst b/docs/changelog.rst
index c36ec9c..8f65af5 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -7,25 +7,27 @@ Changelog
 **1.0.5**
 *********
 
-- **FIX:** fixed a crash caused by having read-only Serializers nested by reference
-- **FIX:** removed erroneous backslashes in paths when routes are generated using Django 2
+- **FIXED:** fixed a crash caused by having read-only Serializers nested by reference
+- **FIXED:** removed erroneous backslashes in paths when routes are generated using Django 2
   `path() <https://docs.djangoproject.com/en/2.0/ref/urls/#django.urls.path>`_
-- **IMPROVEMENT:** updated ``swagger-ui`` to version 3.7.0
+- **IMPROVED:** updated ``swagger-ui`` to version 3.7.0
+- **IMPROVED:** ``FileField`` is now generated as an URL or file name in response Schemas
+  (:pr:`21`, thanks to :ghuser:`h-hirokawa`)
 
 *********
 **1.0.4**
 *********
 
-- **FIX:** fixed improper generation of YAML references
-- **FEATURE:** added ``query_serializer`` parameter to
+- **FIXED:** fixed improper generation of YAML references
+- **ADDED:** added ``query_serializer`` parameter to
   :func:`@swagger_auto_schema <.swagger_auto_schema>` (:issue:`16`, :pr:`17`)
 
 *********
 **1.0.3**
 *********
 
-- **FIX:** fixed bug that caused schema views returned from cache to fail (:issue:`14`)
-- **FIX:** disabled automatic generation of response schemas for form operations to avoid confusing errors caused by
+- **FIXED:** fixed bug that caused schema views returned from cache to fail (:issue:`14`)
+- **FIXED:** disabled automatic generation of response schemas for form operations to avoid confusing errors caused by
   attempting to shove file parameters into Schema objects
 
 *********
diff --git a/docs/conf.py b/docs/conf.py
index 22c83e7..bdad022 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -4,6 +4,7 @@
 # drf-yasg documentation build configuration file, created by
 # sphinx-quickstart on Sun Dec 10 15:20:34 2017.
 import os
+import re
 import sys
 
 import sphinx_rtd_theme
@@ -216,40 +217,59 @@ drf_yasg.views.SchemaView = drf_yasg.views.get_schema_view(None)
 
 # custom interpreted role for linking to GitHub issues and pull requests
 # use as :issue:`14` or :pr:`17`
-gh_issue_uri = "https://github.com/axnsan12/drf-yasg/issues/%d"
-gh_pr_uri = "https://github.com/axnsan12/drf-yasg/pull/%d"
+gh_issue_uri = "https://github.com/axnsan12/drf-yasg/issues/{}"
+gh_pr_uri = "https://github.com/axnsan12/drf-yasg/pull/{}"
+gh_user_uri = "https://github.com/{}"
+
+
+def sphinx_err(inliner, lineno, rawtext, msg):
+    msg = inliner.reporter.error(msg, line=lineno)
+    prb = inliner.problematic(rawtext, rawtext, msg)
+    return [prb], [msg]
+
+
+def sphinx_ref(options, rawtext, text, ref):
+    set_classes(options)
+    node = nodes.reference(rawtext, text, refuri=ref, **options)
+    return [node], []
+
+
+def role_github_user(name, rawtext, text, lineno, inliner, options=None, content=None):
+    options = options or {}
+    content = content or []
+
+    if not re.match(r"^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}$", text):
+        return sphinx_err(inliner, lineno, rawtext, '"%s" is not a valid GitHub username.' % text)
+
+    ref = gh_user_uri.format(text)
+    text = '@' + utils.unescape(text)
+    return sphinx_ref(options, rawtext, text, ref)
 
 
 def role_github_pull_request_or_issue(name, rawtext, text, lineno, inliner, options=None, content=None):
     options = options or {}
     content = content or []
     try:
-        ghid = int(text)
-        if ghid <= 0:
+        if int(text) <= 0:
             raise ValueError
     except ValueError:
-        msg = inliner.reporter.error(
-            'GitHub pull request or issue number must be a number greater than or equal to 1; '
-            '"%s" is invalid.' % text, line=lineno
+        return sphinx_err(
+            inliner, lineno, rawtext,
+            'GitHub pull request or issue number must be a number greater than or equal to 1; "%s" is invalid.' % text
         )
-        prb = inliner.problematic(rawtext, rawtext, msg)
-        return [prb], [msg]
-        # Base URL mainly used by inliner.rfc_reference, so this is correct:
 
     if name == 'pr':
         ref = gh_pr_uri
     elif name == 'issue':
         ref = gh_issue_uri
     else:
-        msg = inliner.reporter.error('unknown tag name for GitHub reference - "%s"' % name, line=lineno)
-        prb = inliner.problematic(rawtext, rawtext, msg)
-        return [prb], [msg]
+        return sphinx_err(inliner, lineno, rawtext, 'unknown role name for GitHub reference - "%s"' % name)
 
-    ref = ref % ghid
-    set_classes(options)
-    node = nodes.reference(rawtext, '#' + utils.unescape(text), refuri=ref, **options)
-    return [node], []
+    ref = ref.format(text)
+    text = '#' + utils.unescape(text)
+    return sphinx_ref(options, rawtext, text, ref)
 
 
 roles.register_local_role('pr', role_github_pull_request_or_issue)
 roles.register_local_role('issue', role_github_pull_request_or_issue)
+roles.register_local_role('ghuser', role_github_user)
diff --git a/src/drf_yasg/generators.py b/src/drf_yasg/generators.py
index dc98408..522d27d 100644
--- a/src/drf_yasg/generators.py
+++ b/src/drf_yasg/generators.py
@@ -38,7 +38,6 @@ class EndpointEnumerator(_EndpointEnumerator):
         :return: the unescaped path
         :rtype: str
         """
-        original_path = path
         clean_path = ''
         while path:
             match = PATH_PARAMETER_RE.search(path)
diff --git a/src/drf_yasg/utils.py b/src/drf_yasg/utils.py
index e8d0712..3a74ae8 100644
--- a/src/drf_yasg/utils.py
+++ b/src/drf_yasg/utils.py
@@ -177,12 +177,15 @@ def serializer_field_to_swagger(field, swagger_object_type, definitions=None, **
     description = description if swagger_object_type != openapi.Items else None  # Items has no description either
 
     def SwaggerType(**instance_kwargs):
-        if swagger_object_type == openapi.Parameter:
+        if swagger_object_type == openapi.Parameter and 'required' not in instance_kwargs:
             instance_kwargs['required'] = field.required
-        if swagger_object_type != openapi.Items:
+        if swagger_object_type != openapi.Items and 'default' not in instance_kwargs:
             default = getattr(field, 'default', serializers.empty)
             if default is not serializers.empty:
                 instance_kwargs['default'] = default
+        if swagger_object_type == openapi.Schema and 'read_only' not in instance_kwargs:
+            if field.read_only:
+                instance_kwargs['read_only'] = True
         instance_kwargs.update(kwargs)
         return swagger_object_type(title=title, description=description, **instance_kwargs)
 
@@ -214,8 +217,6 @@ def serializer_field_to_swagger(field, swagger_object_type, definitions=None, **
             required = []
             for key, value in serializer.fields.items():
                 properties[key] = serializer_field_to_swagger(value, ChildSwaggerType, definitions)
-                if value.read_only and not isinstance(properties[key], openapi._Ref):
-                    properties[key].read_only = value.read_only
                 if value.required:
                     required.append(key)
 
@@ -287,19 +288,20 @@ def serializer_field_to_swagger(field, swagger_object_type, definitions=None, **
     elif isinstance(field, serializers.FileField):
         # swagger 2.0 does not support specifics about file fields, so ImageFile gets no special treatment
         # OpenAPI 3.0 does support it, so a future implementation could handle this better
-        err = SwaggerGenerationError("parameter of type file is supported only in a formData Parameter")
+        err = SwaggerGenerationError("FileField is supported only in a formData Parameter or response Schema")
         if swagger_object_type == openapi.Schema:
             # FileField.to_representation returns URL or file name
             result = SwaggerType(type=openapi.TYPE_STRING, read_only=True)
             if getattr(field, 'use_url', api_settings.UPLOADED_FILES_USE_URL):
                 result.format = openapi.FORMAT_URI
             return result
-        elif swagger_object_type != openapi.Parameter:
+        elif swagger_object_type == openapi.Parameter:
+            param = SwaggerType(type=openapi.TYPE_FILE)
+            if param['in'] != openapi.IN_FORM:
+                raise err  # pragma: no cover
+            return param
+        else:
             raise err  # pragma: no cover
-        param = SwaggerType(type=openapi.TYPE_FILE)
-        if param['in'] != openapi.IN_FORM:
-            raise err  # pragma: no cover
-        return param
     elif isinstance(field, serializers.DictField) and swagger_object_type == openapi.Schema:
         child_schema = serializer_field_to_swagger(field.child, ChildSwaggerType, definitions)
         return SwaggerType(
diff --git a/testproj/articles/serializers.py b/testproj/articles/serializers.py
index 63f0abb..a01ad8c 100644
--- a/testproj/articles/serializers.py
+++ b/testproj/articles/serializers.py
@@ -15,7 +15,7 @@ class ArticleSerializer(serializers.ModelSerializer):
         model = Article
         fields = ('title', 'body', 'slug', 'date_created', 'date_modified',
                   'references', 'uuid', 'cover', 'cover_name')
-        read_only_fields = ('date_created', 'date_modified', 'cover')
+        read_only_fields = ('date_created', 'date_modified')
         lookup_field = 'slug'
         extra_kwargs = {'body': {'help_text': 'body serializer help_text'}}