grails - RichUI星级评定存在问题

Question

我正在为Grails开发带有RichUI插件的评分系统。首先，我有以下代码:

class RatingController {

def springSecurityService

static scaffold = true

def rate = {
    def rating = params.rating
    def artist = Artist.get( params.id )
    def currentUser = currentUser()

    currentUser.addToRatings(new Rating(artist:artist, rating:rating)).save()
    render(template: "/artist/rate", model: [artist: artist, rating: rating])

    }

private currentUser(){
    return User.get(springSecurityService.principal.id)
}
}

效果很好，但是此代码的问题在于，如果用户更新一位艺术家的评级，它将始终创建一个新的Rating实例，而不仅仅是更新评级值。
所以我想出了以下代码:

class RatingController {

def springSecurityService

static scaffold = true

def rate = {
    def rating = params.rating
    def artist = Artist.get( params.id )
    def currentUser = currentUser()

    if(! currentUser.ratings.artist.contains(artist)){
        currentUser.addToRatings(new Rating(artist:artist, rating:rating)).save()
        render(template: "/artist/rate", model: [artist: artist, rating: rating])
    }

    else{
        currentUser.ratings.find{it.artist==artist}.rating = rating
        currentUser.save()
        render(template: "/artist/rate", model: [artist: artist, rating: rating])
    }
}

private currentUser(){
    return User.get(springSecurityService.principal.id)
}
}

但是，使用此代码，当在“else”块中将等级值分配给新等级(params.rating)时，会将其分配给大约50的某个随机数(如53)。我看不出问题出在哪里。
一点帮助将不胜感激。
非常感谢。

Answer 1

我才发现问题出在哪里。我必须将等级的输入值转换为double类型。因此，以下代码可以正常运行:

class RatingController {

    def springSecurityService

    static scaffold = true

    def rate = {
        def rating = params.rating.toDouble()
        def artist = Artist.get( params.id )
        def currentUser = currentUser()

        if(! currentUser.ratings.artist.contains(artist)){
           currentUser.addToRatings(new Rating(artist:artist, rating:rating)).save()
           render(template: "/artist/rate", model: [artist: artist, rating: rating])
        }

        else{
           currentUser.ratings.find{it.artist==artist}.rating = rating
           currentUser.save()
           render(template: "/artist/rate", model: [artist: artist, rating: rating])
        }
   }

   private currentUser(){
        return User.get(springSecurityService.principal.id)
   }
   }