models.py: Add get_role_name function in UserProfile class.

This function returns the name of the user role that we can use
to display in error report emails.

corporate/views.py

@@ -192,14 +192,7 @@ def sponsorship(request: HttpRequest, user: UserProfile,
     realm = user.realm
 
     requested_by = user.full_name
-
+    user_role = user.get_role_name()
-    role_id_to_name_map = {
-        UserProfile.ROLE_REALM_OWNER: "Realm owner",
-        UserProfile.ROLE_REALM_ADMINISTRATOR: "Realm adminstrator",
-        UserProfile.ROLE_MEMBER: "Member",
-        UserProfile.ROLE_GUEST: "Guest"
-    }
-    user_role = role_id_to_name_map[user.role]
 
     support_realm_uri = get_realm(settings.STAFF_SUBDOMAIN).uri
     support_url = urljoin(support_realm_uri, urlunsplit(("", "", reverse('analytics.views.support'),

zerver/models.py

@@ -1124,6 +1124,16 @@ class UserProfile(AbstractBaseUser, PermissionsMixin):
         presence_enabled=bool,
     )
 
+    ROLE_ID_TO_NAME_MAP = {
+        ROLE_REALM_OWNER: "Realm owner",
+        ROLE_REALM_ADMINISTRATOR: "Realm adminstrator",
+        ROLE_MEMBER: "Member",
+        ROLE_GUEST: "Guest"
+    }
+
+    def get_role_name(self) -> str:
+        return self.ROLE_ID_TO_NAME_MAP[self.role]
+
     @property
     def profile_data(self) -> ProfileData:
         values = CustomProfileFieldValue.objects.filter(user_profile=self)