Add custom NullBooleanField to convert null values to False

dispatch/api/fields.py

@@ -4,15 +4,28 @@
 from rest_framework.exceptions import ValidationError
 
 class JSONField(Field):
-
     def to_internal_value(self, data):
         return data
 
     def to_representation(self, value):
         return value
 
-class PrimaryKeyField(Field):
+class NullBooleanField(Field):
+    """Forces a Django NullBooleanField to always return False for null values."""
+
+    def get_attribute(self, instance):
+        """Overrides the default get_attribute method to convert None values to False."""
 
+        attr = super(NullBooleanField, self).get_attribute(instance)
+        return True if attr else False
+
+    def to_internal_value(self, data):
+        return True if data else None
+
+    def to_representation(self, value):
+        return True if value else False
+
+class PrimaryKeyField(Field):
     def __init__(self, serializer, *args, **kwargs):
         super(PrimaryKeyField, self).__init__(*args, **kwargs)
 

dispatch/api/serializers.py

@@ -18,7 +18,7 @@
 from dispatch.api.validators import (
     FilenameValidator, ImageGalleryValidator, PasswordValidator,
     SlugValidator, AuthorValidator, TemplateValidator)
-from dispatch.api.fields import JSONField, PrimaryKeyField, ForeignKeyField
+from dispatch.api.fields import JSONField, NullBooleanField, PrimaryKeyField, ForeignKeyField
 
 class PersonSerializer(DispatchModelSerializer):
     """Serializes the Person model."""
@@ -608,6 +608,8 @@ class ArticleSerializer(DispatchModelSerializer, DispatchPublishableSerializer):
     id = serializers.ReadOnlyField(source='parent_id')
     slug = serializers.SlugField(validators=[SlugValidator()])
 
+    is_published = NullBooleanField(read_only=True)
+
     section = SectionSerializer(read_only=True)
     section_id = serializers.IntegerField(write_only=True)
 
@@ -770,6 +772,8 @@ class PageSerializer(DispatchModelSerializer, DispatchPublishableSerializer):
     id = serializers.ReadOnlyField(source='parent_id')
     slug = serializers.SlugField(validators=[SlugValidator()])
 
+    is_published = NullBooleanField(read_only=True)
+
     featured_image = ImageAttachmentSerializer(required=False, allow_null=True)
     featured_video = VideoAttachmentSerializer(required=False, allow_null=True)