fixing Sunday display on calendar

core/models/logbooks.py

@@ -33,6 +33,7 @@ todo='''
 '''
 
 class CaveSlug(models.Model):
+    """Moved here to avoid nasty cyclic import error"""
     cave = models.ForeignKey('Cave',on_delete=models.CASCADE)
     slug = models.SlugField(max_length=50, unique = True)
     primary = models.BooleanField(default=False)
@@ -41,7 +42,6 @@ class LogbookEntry(TroggleModel):
     """Single parsed entry from Logbook
     """
     date    = models.DateField()#MJG wants to turn this into a datetime such that multiple Logbook entries on the same day can be ordered.ld()
-    # expeditionday = models.ForeignKey("ExpeditionDay", null=True,on_delete=models.SET_NULL)#MJG wants to KILL THIS (redundant information)
     expedition = models.ForeignKey(Expedition,blank=True, null=True,on_delete=models.SET_NULL)  # yes this is double-
     title      = models.CharField(max_length=200)
     cave_slug  = models.SlugField(max_length=50, blank=True, null=True)
@@ -77,9 +77,16 @@ class LogbookEntry(TroggleModel):
     def DayIndex(self):
         """This is used to set different colours for the different trips on
         the calendar view of the expedition"""
-        index = list(LogbookEntry.objects.filter(date=self.date)).index(self)
-        if index not in range(0,10):
-           print(f"Unexpected LogbookEntry DayIndex '{index}' {self}")
+        mx = 10
+        todays = list(LogbookEntry.objects.filter(date=self.date))
+        if self in todays:
+            index = todays.index(self)
+        else:
+           print(f"DayIndex: Synchronization error. Restart server.  {self}")
+           index = 0
+           
+        if index not in range(0, mx):
+           print(f"DayIndex: More than {mx-1} LogbookEntry items on one day  '{index}' {self}")
            index = 0
         return index