44 lines
902 B
Go

package arn
// HasLikes implements common like and unlike methods.
type hasLikes struct {
Likes []string `json:"likes"`
}
// Like makes the given user ID like the object.
func (obj *hasLikes) Like(userID UserID) {
for _, id := range obj.Likes {
if id == userID {
return
}
}
obj.Likes = append(obj.Likes, userID)
}
// Unlike makes the given user ID unlike the object.
func (obj *hasLikes) Unlike(userID UserID) {
for index, id := range obj.Likes {
if id == userID {
obj.Likes = append(obj.Likes[:index], obj.Likes[index+1:]...)
return
}
}
}
// LikedBy checks to see if the user has liked the object.
func (obj *hasLikes) LikedBy(userID UserID) bool {
for _, id := range obj.Likes {
if id == userID {
return true
}
}
return false
}
// CountLikes returns the number of likes the object has received.
func (obj *hasLikes) CountLikes() int {
return len(obj.Likes)
}