Can delete group members

src/helpers/groups_helper.rs

@@ -297,6 +297,20 @@ pub fn count_members(group_id: &GroupID) -> ResultBoxError<usize> {
         .exec_count()
 }
 
+/// Count the number of group's members at a specific level
+pub fn count_members_at_level(group_id: &GroupID, level: GroupMembershipLevel) -> ResultBoxError<usize> {
+    database::QueryInfo::new(GROUPS_MEMBERS_TABLE)
+        .cond_group_id("groups_id", group_id)
+        .cond_u32("level", level.to_db())
+        .exec_count()
+}
+
+/// Check out whether a user is the last administrator of a group
+pub fn is_last_admin(group_id: &GroupID, user_id: &UserID) -> ResultBoxError<bool> {
+    Ok(get_membership_level(group_id, Some(user_id.clone()))? == GroupMembershipLevel::ADMINISTRATOR &&
+        count_members_at_level(&group_id, GroupMembershipLevel::ADMINISTRATOR)? == 1)
+}
+
 /// Check the availability of a virtual directory for a group
 pub fn check_directory_availability(dir: &str, group_id: Option<GroupID>) -> ResultBoxError<bool> {
     let group = find_by_virtual_directory(dir);