improve trainee management

generic/views.py

@@ -2853,6 +2853,17 @@ def users_bulk_edit(request):
                     ]
                 )
                 # TODO: work out how to actually use hyperscript
+                html = (
+                    html
+                    + 
+                        f"""<button class='change-grade-button' id='add-grade--remove'
+                    hx-post="{reverse('generic:users_bulk_edit')}"
+                    hx-include="[name='selection']"
+                    hx-confirm="This will remove grades of all selected users, are you sure you wish to continue?"
+                    hx-target="#htmx-info"
+                    _='on click put "" into #htmx-options'
+                >Remove</button>"""
+                )
                 html = (
                     html
                     + "<button class='cancel-button' _='on click for el in .change-grade-button remove el end then remove me'>Cancel</button>"
@@ -2861,9 +2872,14 @@ def users_bulk_edit(request):
             case r if r.startswith("add-grade"):
                 user_models = get_user_selection_from_request(request)
 
+                grade = r.split("--")[-1]
+
+                if grade == "remove":
+                    grade = None
+
                 # u: User
                 for u in user_models:
-                    u.userprofile.grade_id = r.split("--")[-1]
+                    u.userprofile.grade_id = grade
                     u.save()
                 html = "Grades updated"
             case "bulk-add-group-button":