make future DRF 3.12 openapi changes work for DRF 3.11

Author: n2ygk

example/tests/test_openapi.py

@@ -103,6 +103,15 @@ def test_delete_request(snapshot):
         {'delete': 'delete'}
     )
     inspector = AutoSchema()
+    # DRF >=3.12 changes the capitalization of these method mappings which breaks the snapshot,
+    # so just override them to be consistent with >=3.12
+    inspector.method_mapping = {
+        'get': 'retrieve',
+        'post': 'create',
+        'put': 'update',
+        'patch': 'partialUpdate',
+        'delete': 'destroy',
+    }
     inspector.view = view
 
     operation = inspector.get_operation(path, method)

rest_framework_json_api/schemas/openapi.py

@@ -273,6 +273,8 @@ class SchemaGenerator(drf_openapi.SchemaGenerator):
     def __init__(self, *args, **kwargs):
         self.openapi_schema = {}
         super().__init__(*args, **kwargs)
+        if not hasattr(self, 'check_duplicate_operation_id'):
+            self.check_duplicate_operation_id = lambda paths: None
 
     def get_schema(self, request=None, public=False):
         """
@@ -453,6 +455,18 @@ def __init__(self, openapi_schema=None, **kwargs):
         # TODO: shallow or deep merge?
         self.openapi_schema = {**self.openapi_schema, **jsonapi_ref}
 
+        # DRF >= 3.12 (not yet released) has changed a bunch of private methods to public.
+        # Accommodate those renamings for DRF < 3.12
+        # TODO: Since the DRF version string is not updated until after a release, for now,
+        #       still need to check for it like this:
+        if not hasattr(self, 'get_path_parameters'):  # use this as a proxy for < 3.12
+            self.get_path_parameters = self._get_path_parameters
+            self.get_pagination_parameters = self._get_pagination_parameters
+            self.get_filter_parameters = self._get_filter_parameters
+            self.get_components = lambda path, method: {}  # no get_components for <= 3.12
+            self.map_field = self._map_field
+            self.map_field_validators = self._map_field_validators
+
     def get_operation(self, path, method, action=None):
         """ basically a copy of AutoSchema.get_operation """
         operation = {}