improved filter form

rowers/forms.py

@@ -752,7 +752,66 @@ class RaceResultFilterForm(forms.Form):
         label='Weight Category',
         initial=['hwt','lwt'],
         widget=forms.CheckboxSelectMultiple())
-        
+
+    def __init__(self, *args, **kwargs):
+        if 'records' in kwargs:
+            records = kwargs.pop('records',None)
+            
+        super(RaceResultFilterForm,self).__init__(*args,**kwargs)
+
+        if records:
+            # sex
+            thesexes = [record.sex for record in records]
+            thesexes = list(set(thesexes))
+
+            if len(thesexes)<= 1:
+                del self.fields['sex']
+            else:
+                sexchoices = []
+                for choice in self.fields['sex'].choices:
+                    if choice[0] in thesexes:
+                        sexchoices.append(choice)
+                self.fields['sex'].choices = sexchoices
+
+            # boatclass
+            theboatclasses = [record.boatclass for record in records]
+            theboatclasses = list(set(theboatclasses))
+
+            if len(theboatclasses)<= 1:
+                del self.fields['boatclass']
+            else:
+                boatclasschoices = []
+                for choice in self.fields['boatclass'].choices:
+                    if choice[0] in theboatclasses:
+                        boatclasschoices.append(choice)
+                self.fields['boatclass'].choices = boatclasschoices
+                
+            # boattype
+            theboattypees = [record.boattype for record in records]
+            theboattypees = list(set(theboattypees))
+
+            if len(theboattypees)<= 1:
+                del self.fields['boattype']
+            else:
+                boattypechoices = []
+                for choice in self.fields['boattype'].choices:
+                    if choice[0] in theboattypees:
+                        boattypechoices.append(choice)
+                self.fields['boattype'].choices = boattypechoices
+                
+            # weightcategory
+            theweightcategoryes = [record.weightcategory for record in records]
+            theweightcategoryes = list(set(theweightcategoryes))
+
+            if len(theweightcategoryes)<= 1:
+                del self.fields['weightcategory']
+            else:
+                weightcategorychoices = []
+                for choice in self.fields['weightcategory'].choices:
+                    if choice[0] in theweightcategoryes:
+                        weightcategorychoices.append(choice)
+                self.fields['weightcategory'].choices = weightcategorychoices
+                    
 class WorkoutRaceSelectForm(forms.Form):
 #    evaluate_after = forms.TimeField(
 #        input_formats=['%H:%M:%S.%f',