From 58f55b466adf0401cbfaac79c04b9c57dfcbcd39 Mon Sep 17 00:00:00 2001
From: Denis Orehovsky <denis.orehovsky@gmail.com>
Date: Sun, 23 Aug 2020 09:02:49 +0300
Subject: [PATCH 1/2] Add a method for getting serializer field name

---
 rest_framework/schemas/openapi.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/rest_framework/schemas/openapi.py b/rest_framework/schemas/openapi.py
index 9774a94c76..f16b3d1e97 100644
--- a/rest_framework/schemas/openapi.py
+++ b/rest_framework/schemas/openapi.py
@@ -516,7 +516,7 @@ def map_serializer(self, serializer):
                 continue
 
             if field.required:
-                required.append(field.field_name)
+                required.append(self.get_field_name(field))
 
             schema = self.map_field(field)
             if field.read_only:
@@ -531,7 +531,7 @@ def map_serializer(self, serializer):
                 schema['description'] = str(field.help_text)
             self.map_field_validators(field, schema)
 
-            properties[field.field_name] = schema
+            properties[self.get_field_name(field)] = schema
 
         result = {
             'type': 'object',
@@ -582,6 +582,9 @@ def map_field_validators(self, field, schema):
                     schema['maximum'] = int(digits * '9') + 1
                     schema['minimum'] = -schema['maximum']
 
+    def get_field_name(self, field):
+        return field.field_name
+
     def get_paginator(self):
         pagination_class = getattr(self.view, 'pagination_class', None)
         if pagination_class:

From 65ab47ce5527e10743b0f5729a93e2d69fbc12cd Mon Sep 17 00:00:00 2001
From: Denis Orehovsky <denis.orehovsky@gmail.com>
Date: Sun, 23 Aug 2020 11:41:34 +0300
Subject: [PATCH 2/2] Add docs and test

---
 rest_framework/schemas/openapi.py |  4 ++++
 tests/schemas/test_openapi.py     | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/rest_framework/schemas/openapi.py b/rest_framework/schemas/openapi.py
index f16b3d1e97..4f6f180675 100644
--- a/rest_framework/schemas/openapi.py
+++ b/rest_framework/schemas/openapi.py
@@ -583,6 +583,10 @@ def map_field_validators(self, field, schema):
                     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):
diff --git a/tests/schemas/test_openapi.py b/tests/schemas/test_openapi.py
index d483f3d456..d3f1629758 100644
--- a/tests/schemas/test_openapi.py
+++ b/tests/schemas/test_openapi.py
@@ -107,6 +107,20 @@ class Serializer(serializers.Serializer):
         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):