Set None in case the LocalizedIntegerField is null

In case the LocalizedIntegerField is null in the DB then it must explicitly be set to None,
otherwise it will yield TypeError: __str__ returned non-string

Author: Adrian Muntean

README.rst

@@ -279,7 +279,7 @@ Besides ``LocalizedField``, there's also:
 
     Allows storing integers in multiple languages. This works exactly like ``LocalizedField`` except that
     all values must be integers. Do note that values are stored as strings in your database because
-    the backing field type is ``hstore``, which only allows storing integers. The ``LocalizedIntegerField``
+    the backing field type is ``hstore``, which only allows storing strings. The ``LocalizedIntegerField``
     takes care of ensuring that all values are integers and converts the stored strings back to integers
     when retrieving them from the database. Do not expect to be able to do queries such as:
 

localized_fields/widgets.py

@@ -6,7 +6,7 @@
 from django import forms
 from django.contrib.admin import widgets
 
-from .value import LocalizedValue
+from .value import LocalizedValue, LocalizedIntegerValue
 
 
 class LocalizedFieldWidget(forms.MultiWidget):
@@ -52,6 +52,7 @@ def decompress(self, value: LocalizedValue) -> List[str]:
         return result
 
     def get_context(self, name, value, attrs):
+        value = self.remove_if_needed(value)
         context = super(forms.MultiWidget, self).get_context(name, value, attrs)
         if self.is_localized:
             for widget in self.widgets:
@@ -98,6 +99,16 @@ def build_widget_attrs(widget, value, attrs):
 
         return attrs
 
+    @staticmethod
+    def remove_if_needed(value):
+        """If the field LocalizedIntegerField is null in the DB then it must
+        be set to None so it can be represented"""
+        if isinstance(value, LocalizedIntegerValue):
+            not_none_score = list(filter(lambda x: value[x] is not None, [i[0] for i in settings.LANGUAGES]))
+            return value if len(not_none_score) > 0 else None
+        else:
+            return value
+
 
 class LocalizedCharFieldWidget(LocalizedFieldWidget):
     """Widget that has an input box for every language."""