[2.9] postgresql_set: Return a message when a passed parameter has not been found

changelogs/fragments/42-postgresql_set_add_message_when_parameter_not_found.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- postgresql_set - return a message instead of traceback when a passed parameter has not been found (https://github.com/ansible-collections/community.postgresql/issues/41).

lib/ansible/modules/database/postgresql/postgresql_set.py

@@ -195,6 +195,11 @@ def param_get(cursor, module, name):
     except Exception as e:
         module.fail_json(msg="Unable to get %s value due to : %s" % (name, to_native(e)))
 
+    if not info:
+        module.fail_json(msg="No such parameter: %s. "
+                             "Please check its spelling or presence in your PostgreSQL version "
+                             "(https://www.postgresql.org/docs/current/runtime-config.html)" % name)
+
     raw_val = info[0][1]
     unit = info[0][2]
     context = info[0][3]

test/integration/targets/postgresql/tasks/postgresql_set.yml

@@ -302,3 +302,19 @@
   - assert:
       that:
       - result.query_result.0.reset_val == "test ! -f /mnt/postgres/mb/%f && cp %p /mnt/postgres/mb/%f"
+
+  #################################################################################
+  # Bugfix of https://github.com/ansible-collections/community.postgresql/issues/41
+  - name: Pass non-existent parameter
+    <<: *task_parameters
+    postgresql_set:
+      <<: *pg_parameters
+      name: Timezone
+      value: utc
+    register: result
+    ignore_errors: yes
+
+  - assert:
+      that:
+      - result is failed
+      - result.msg is search('No such parameter')