HQL - need help on query
I have entities: Tweet
and User
.
Tweet
has an author
, which is an instance of User
class. User is following others users and also keeps track of users following him:
@ManyToMany
public List<User> following;
@ManyToMany(mappedBy = "following", fetch = FetchType.LAZY)
public List<User> followedBy;
Now I'd like to load tweets of users that I'm currently following. I tried this:
"FROM Tweet AS tweet " +
"JOIN tweet.author as author " +
"JOIN author.followedBy as followedBy " +
"WHERE tweet.author = followedBy AND ? in followedBy ORDER BY dateCreated DESC"
But it doesn't work. I suck in sophisticated queries.
EDIT
Generated query, which I copied from the exception which was thrown:
SELECT TWEET0_.ID AS ID10_, TWEET0_.AUTHOR_ID AS AUTHOR4_10_, TWEET0_.CONTENT AS CONTENT10_, TWEET0_.DATECREATED AS DATECREA3_10_
FROM TWEET TWEET0_
INNER JOIN USER USER1_ ON TWEET0_.AUTHOR_ID=USER1_.ID
WHERE USER1_.ID IN
(SELECT .[*] FROM USER USER2_, USER_USER FOLLOWING3_, USER USER4_ WHERE USER2_.ID=FOLLOWING3_.FOLLOWEDBY_ID AND FOLLOWING3_.FOLLOWING_ID=USER4_.ID AND USER2_.ID=?)
ORDER BY TWEET0_.DATECREATED DESC LIMIT ?
Edit 2
Unfortunately, now I'm getting IllegalArgumentException
:
IllegalArgumentException occured :
org.hibernate.QueryException: illegal attempt to dereference collection [user2_.id.following] with element property reference [id] [select tweet from models.Tweet tweet join tweet.author author wh开发者_Go百科ere author in (select user.following.id from models.User user where user.id = :id) order by tweet.dateCreated desc]
I'd use a subquery here:
select tweet from Tweet tweet
join tweet.author author
where author in
(select following.id from User user join user.following following where user.id = :id)
order by tweet.dateCreated desc
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