title: I cannot search a field when i added a serializermethod in documentviewset
body: <pre><code>class VariantSerializers(DocumentSerializer):
      uom = serializers.SerializerMethodField('get_uom')
  
      def get_uom(request,obj):
          if obj.uom_id is not None:
              uomData = Uom.objects.filter(code=obj.uom_id).first()
          if uomData is None:
              return obj.uom_id
          return uomData.name
      class Meta:
          model = Variant
          document = VariantDoc
          fields = '__all__'
  </code></pre>
  <p>Here i added a serializermethod and here i cannot search with uom name but it's not working</p>