add QueryParamField support to auto-generated documentation

rest_framework/fields.py

@@ -767,6 +767,10 @@ class CharField(Field):
         return six.text_type(value)
 
 
+class QueryParamField(CharField):
+    pass
+
+
 class EmailField(CharField):
     default_error_messages = {
         'invalid': _('Enter a valid email address.')

rest_framework/schemas.py

@@ -590,10 +590,12 @@ class SchemaGenerator(object):
             if field.read_only or isinstance(field, serializers.HiddenField):
                 continue
 
+            location = 'query' if isinstance(field, serializers.QueryParamField) else 'form'
+
             required = field.required and method != 'PATCH'
             field = coreapi.Field(
                 name=field.field_name,
-                location='form',
+                location=location,
                 required=required,
                 schema=field_to_schema(field)
             )

rest_framework/serializers.py

@@ -57,7 +57,7 @@ from rest_framework.fields import (  # NOQA # isort:skip
     DictField, DurationField, EmailField, Field, FileField, FilePathField, FloatField,
     HiddenField, IPAddressField, ImageField, IntegerField, JSONField, ListField,
     ModelField, MultipleChoiceField, NullBooleanField, ReadOnlyField, RegexField,
-    SerializerMethodField, SlugField, TimeField, URLField, UUIDField,
+    SerializerMethodField, SlugField, TimeField, URLField, UUIDField, QueryParamField,
 )
 from rest_framework.relations import (  # NOQA # isort:skip
     HyperlinkedIdentityField, HyperlinkedRelatedField, ManyRelatedField,