package model import "fmt" type PodcastAlreadyExistsError struct { Url string } func (e *PodcastAlreadyExistsError) Error() string { return fmt.Sprintf("Podcast with this url already exists") } type TagAlreadyExistsError struct { Label string } func (e *TagAlreadyExistsError) Error() string { return fmt.Sprintf("Tag with this label already exists : " + e.Label) }