Fix error

Author: svenseeberg

opendrift_leeway_webgui/leeway/forms.py

@@ -50,12 +50,6 @@ class LeewaySimulationForm(ModelForm):
     decimal value in the ``clean_latitude`` / ``clean_longitude`` methods.
     """
 
-    # Override model FloatFields as not-required so that returning None from
-    # clean_latitude / clean_longitude (when a sub-field already reported an
-    # error) does not produce a duplicate "This field is required." message.
-    latitude = FloatField(required=False)
-    longitude = FloatField(required=False)
-
     #: Direction choices for latitude
     LAT_DIR_CHOICES = [("N", "N"), ("S", "S")]
     #: Direction choices for longitude
@@ -119,6 +113,13 @@ class LeewaySimulationForm(ModelForm):
         widget=Select(attrs={"class": "coord-dir coord-lon"}),
     )
 
+    # Declared after all sub-fields so that clean_latitude / clean_longitude
+    # run after the sub-fields are already present in cleaned_data.
+    # required=False avoids a duplicate "This field is required." message when
+    # a sub-field already reported an error and clean_* returns None.
+    latitude = FloatField(required=False)
+    longitude = FloatField(required=False)
+
     class Meta:
         """
         Configure form fields and help text.