def serialize_field_value
      case typology
      when 'text'
        serialize_field_value_text
      when 'textarea'
        serialize_field_value_textarea
      when 'datetime'
        serialize_field_value_datetime
      when 'editor'
        serialize_field_value_editor
      when 'geolocalization'
        serialize_field_value_geolocalization
      when 'image'
        serialize_field_value_image
      when 'gallery'
        serialize_field_value_gallery
      when 'youtube'
        serialize_field_value_youtube
      when 'composed'
        serialize_field_value_composed
      when 'relay'
        serialize_field_value_relay
      end
    end
def serialize_field_value
      case typology
      when 'text'
        serialize_field_value_text
      when 'textarea'
        serialize_field_value_textarea
      when 'datetime'
        serialize_field_value_datetime
      when 'editor'
        serialize_field_value_editor
      when 'geolocalization'
        serialize_field_value_geolocalization
      when 'image'
        serialize_field_value_image
      when 'gallery'
        serialize_field_value_gallery
      when 'youtube'
        serialize_field_value_youtube
      when 'composed'
        serialize_field_value_composed
      when 'relay'
        serialize_field_value_relay
      end
    end
Serializer field value:
 **************************************************************************
 This function serialize the field value of the post field.