membershipworks: Provide details when an event is not ready for invoice

membershipworks/models.py

@@ -613,18 +613,26 @@ class EventExt(Event):
             return self.instructor.member == member
         return False
 
+    @property
+    def missing_for_invoice(self) -> list[str]:
+        reasons = {
+            "Missing instructor": self.instructor is None,
+            "Instructor not linked to a member": (
+                self.instructor is not None and self.instructor.member is None
+            ),
+            "Missing materials fee": self.materials_fee is None,
+            "Materials fee is not 0 and materials_fee_included_in_price not defined": (
+                self.materials_fee != 0 and self.materials_fee_included_in_price is None
+            ),
+            "total_due_to_instructor is None (this can have several causes)": (
+                self.total_due_to_instructor is None
+            ),
+        }
+        return [k for k, v in reasons.items() if v]
+
     @property
     def ready_for_invoice(self) -> bool:
-        return (
+        return len(self.missing_for_invoice) == 0
-            self.instructor is not None
-            and self.instructor.member is not None
-            and self.materials_fee is not None
-            and (
-                self.materials_fee_included_in_price is not None
-                or self.materials_fee == 0
-            )
-            and self.total_due_to_instructor is not None
-        )
 
 
 if TYPE_CHECKING:

membershipworks/templates/membershipworks/event_detail.dj.html

@@ -38,6 +38,14 @@
         {% elif not event.ready_for_invoice %}
           <p class="card-text text-center">
             This event is missing required information to generate an invoice. Please contact us at <a href="mailto:info@claremontmakerspace.org">info@claremontmakerspace.org</a>.
+            {% if perms.membershipworks.view_event %}
+              <div>
+                <h5>Issues:</h5>
+                <ul>
+                  {{ event.missing_for_invoice|unordered_list }}
+                </ul>
+              </div>
+            {% endif %}
           </p>
         {% elif user_is_instructor %}
           <form method="post" class="card-text">