Fix property naming

Author: zarya

src/teams/models.py

@@ -622,6 +622,6 @@ def for_sale_users(self) -> list[TeamMember]:
         return [member.user for member in self.team_members.filter(teamshiftassignment__for_sale=True)]
 
     @property
-    def shifts_available(self) -> int:
-        """Returns the number of available shifts."""
+    def shifts_taken(self) -> int:
+        """Returns the number of taken shifts that are not for sale."""
         return self.team_members.filter(teamshiftassignment__for_sale=False).count()

src/teams/templates/team_shift_list.html

@@ -86,7 +86,7 @@ <h4>
                     <i class="fas fa-thumbs-down"></i> Make available
                 </a>
               {% endif %}
-            {% elif shift.people_required > shift.shifts_available %} 
+            {% elif shift.people_required > shift.shifts_taken %} 
               <a class="btn btn-success"
                  href="{% url 'teams:shift_member_take' camp_slug=camp.slug team_slug=team.slug pk=shift.pk %}">
                 <i class="fas fa-thumbs-up"></i> Assign me