Set default limit on /access/ to max limit when no pagination limit supplied

In a recent (PR)[RedHatInsights#195] we removed the default limit
on the `/access/` endpoint, to ensure all records were returned in a single request
instead of using the default of 10.

This meant in order to be backwards compatible, we'd also need to continue supporting
pagination params. To do this, we updated the spec to include `oneOf` two possible
valid responses, one paginated and one unpaginated. The `data` would remain the
same, but the meta data for pagination would not be included unless a `limit`
param was supplied in the request.

The associated updates were made to the `openapi.json` spec, but due to an existing
bug/issue in the OpenAPI Generator project [1,2], this breaks some client generation
which is used by app teams and QE, even though it's valid per the spec.

In order to avoid having a separate endpoint explicitly for a paginated responses,
and to also avoid constructing false meta data for pagination, we've decided to
set the default limit on the `/access/` endpoint equal to the max limit number
when no `limit` is supplied, but continue to respect the `limit` pagination param
when it is supplied.

This will allow for client generation to continue to work, and will allow those
using pagination by default to still be supported. For those not using pagination,
the response `data` should again still be the same, and the default limit will not
be a barrier to hitting pagination, as it will be the same as our max results.

[1] OpenAPITools/openapi-generator#15
[2] OpenAPITools/openapi-generator#1709

Author: coderbydesign

docs/source/specs/openapi.json

@@ -1518,34 +1518,19 @@
             }
           },
           {
-            "$ref": "#/components/parameters/QueryLimitNoDefault"
+            "$ref": "#/components/parameters/QueryLimit"
           },
           {
             "$ref": "#/components/parameters/QueryOffset"
           }
         ],
         "responses": {
           "200": {
-            "description": "A list of access objects. By default, this request will not be paginated. To received a paginated response, include the `/?limit=` query parameter.",
+            "description": "A paginated list of access objects",
             "content": {
               "application/json": {
                 "schema": {
-                  "oneOf": [
-                    {
-                      "$ref": "#/components/schemas/AccessNoPagination"
-                    },
-                    {
-                      "$ref": "#/components/schemas/AccessPagination"
-                    }
-                  ]
-                },
-                "examples": {
-                  "AccessNoPagination": {
-                    "$ref": "#/components/examples/AccessNoPagination"
-                  },
-                  "AccessPagination": {
-                    "$ref": "#/components/examples/AccessPagination"
-                  }
+                  "$ref": "#/components/schemas/AccessPagination"
                 }
               }
             }
@@ -1607,17 +1592,6 @@
           "maximum": 1000
         }
       },
-      "QueryLimitNoDefault": {
-        "in": "query",
-        "name": "limit",
-        "required": false,
-        "description": "Parameter for selecting the amount of data returned.",
-        "schema": {
-          "type": "integer",
-          "minimum": 1,
-          "maximum": 1000
-        }
-      },
       "NameFilter": {
         "in": "query",
         "name": "name",
@@ -2345,24 +2319,6 @@
           }
         ]
       },
-      "AccessNoPagination": {
-        "allOf": [
-          {
-            "type": "object",
-            "required": [
-              "data"
-            ],
-            "properties": {
-              "data": {
-                "type": "array",
-                "items": {
-                  "$ref": "#/components/schemas/Access"
-                }
-              }
-            }
-          }
-        ]
-      },
       "Status": {
         "required": [
           "api_version"
@@ -2414,39 +2370,6 @@
           }
         }
       }
-    },
-    "examples": {
-      "AccessNoPagination": {
-        "value": {
-          "data": [
-            {
-              "permission": "app-name:*:*",
-              "resourceDefinitions": []
-            }
-          ]
-        }
-      },
-      "AccessPagination": {
-        "value": {
-          "meta": {
-            "count": 1,
-            "limit": 10,
-            "offset": 0
-          },
-          "links": {
-            "first": "/access/?application=app-name&limit=10",
-            "next": null,
-            "previous": null,
-            "last": "/access/?application=app-name&limit=10"
-          },
-          "data": [
-            {
-              "permission": "app-name:*:*",
-              "resourceDefinitions": []
-            }
-          ]
-        }
-      }
     }
   }
 }

rbac/management/access/view.py

@@ -94,10 +94,9 @@ def get(self, request):
     def paginator(self):
         """Return the paginator instance associated with the view, or `None`."""
         if not hasattr(self, '_paginator'):
+            self._paginator = self.pagination_class()
             if self.pagination_class is None or 'limit' not in self.request.query_params:
-                self._paginator = None
-            else:
-                self._paginator = self.pagination_class()
+                self._paginator.default_limit = self._paginator.max_limit
         return self._paginator
 
     def paginate_queryset(self, queryset):

tests/management/access/test_view.py

@@ -123,7 +123,7 @@ def test_get_access_success(self):
         self.assertIsNotNone(response.data.get('data'))
         self.assertIsInstance(response.data.get('data'), list)
         self.assertEqual(len(response.data.get('data')), 1)
-        self.assertIsNone(response.data.get('meta'))
+        self.assertEqual(response.data.get('meta').get('limit'), 1000)
         self.assertEqual(self.access_data, response.data.get('data')[0])
 
     def test_get_access_with_limit(self):