Add docs and test

rest_framework/schemas/openapi.py

@@ -583,6 +583,10 @@ class AutoSchema(ViewInspector):
                     schema['minimum'] = -schema['maximum']
 
     def get_field_name(self, field):
+        """
+        Override this method if you want to change schema field name.
+        For example, convert snake_case field name to camelCase.
+        """
         return field.field_name
 
     def get_paginator(self):

tests/schemas/test_openapi.py

@@ -107,6 +107,20 @@ class TestFieldMapping(TestCase):
         assert data['properties']['default_false']['default'] is False, "default must be false"
         assert 'default' not in data['properties']['without_default'], "default must not be defined"
 
+    def test_custom_field_name(self):
+        class CustomSchema(AutoSchema):
+            def get_field_name(self, field):
+                return 'custom_' + field.field_name
+
+        class Serializer(serializers.Serializer):
+            text_field = serializers.CharField()
+
+        inspector = CustomSchema()
+
+        data = inspector.map_serializer(Serializer())
+        assert 'custom_text_field' in data['properties']
+        assert 'text_field' not in data['properties']
+
 
 @pytest.mark.skipif(uritemplate is None, reason='uritemplate not installed.')
 class TestOperationIntrospection(TestCase):