grails - 对两个关联的Grails GORM查询

Question

我需要在具有两个关联对象的域上进行查询。

class UserVideo {
    User user
    Video video
}
class User {
    String name
}
class Video {
    String title
}

我需要找到属于给定用户的所有UserVideo，并且video.title就像一个字符串。例如，“查找属于用户'Fred'的所有UserVideo，而Video.title就像'％Potter％'。”
无论我尝试了什么，都无济于事。

根据要求，以下是我执行操作的代码:

    def list(Integer max, String title) {
    def userName = springSecurityService?.principal?.username
    def user = User.findByUsername(userName)
    params.max = Math.min(max ?: 10, 100)
    def results
    if (title) {
        def c = UserVideo.createCriteria()
        results = c.list {
            eq("user", user)
            video {
                ilike("title", "%${title}%")
            }
        }
    } else {
        results = UserVideo.findAllByUser(user, params)
    }
    def userVideos = results.collect({ UserVideo uv ->
        [uId: uv.user?.id, vId: uv.video?.id, number: uv.number, title: uv.video?.title,
                format: uv.video?.format?.name, rating: uv.video?.rating?.name, genres: uv.video?.genreNames]
    })
    [userVideos: userVideos, total: UserVideo.count()]
}

这是我得到的错误:

URI
/movies/userVideo/list
Class
org.h2.jdbc.JdbcSQLException
Message
Column "VIDEO_ALIA1_.TITLE" not found; SQL statement: select this_.user_id as user1_2_0_, this_.video_id as video2_2_0_, this_.number as number2_0_ from user_video this_ where this_.user_id=? and (lower(video_alia1_.title) like ?) [42122-170]

Answer 1

像这样

def c = UserVideo.createCriteria()
def results = c.list {
  eq("user", User.findByName("Fred"))
  video {
    ilike("title", "%Potter%")
  }
}

更新-尝试HQL

UserVideo.executeQuery("""
  Select uv
  From UserVideo as uv join uv.video v join uv.user u
  where lower(v.title) like lower(:title)
  and u = :user
""", [user: user, title: "%${title}%"])