我有2个与多对多关系的域,并且这个关系的中间表
class Song implements Taggable {
static belongsTo = [User]
static hasMany = [audios: Audio, couplets: Couplet, hasSongListSong: HasSongListSong, hasSublistSong: HasSublistSong]
String title
Boolean isChorusRepeat = false
Boolean deleted = false
Date dateCreated, lastUpdated
static constraints = {
title blank: false, size:1..129
}
}
class SongList {
static belongsTo = [User]
static hasMany = [hasAccess: HasAccess, songListHasSong: HasSongListSong, songSubList: SongSubList]
String title
User user
Boolean deleted = false
Date dateCreated, lastUpdated
static constraints = {
title size: 3..128, blank: false, unique: false
}
}
带有Song和SongList id的中间表,用于存储关系
class HasSongListSong {
static belongsTo = [SongList, Song]
SongList songList
Song song
static constraints = {
}
}
当我尝试在此表中设置数据时,我得到了这个惊喜
def addSongs() {
def hasSong = new HasSongListSong();
hasSong.songId = Song.load(1)
hasSong.songListId = SongList.load(1)
}
第二个问题,如果我从前端范围的id接收到,如何更好地保存这种情况,我的意思是要向 Controller 发出带有songId 1,2,.. n集合的请求。我应该使用一些迭代器,或者有更好的方法?
最佳答案
您不设置ID,而是设置对象:
def addSongs() {
def hasSong = new HasSongListSong();
hasSong.song = Song.load(1)
hasSong.songList = SongList.load(1)
}
在第二个问题中问您一个新问题,我可以尝试回答。
关于grails - Grails “Cannot set readonly property”,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29613393/