Entities: Post, Space and Profile. In summary:
class Post { Space space; String text; }
class Space { List<Profile> members; }
class Profile { String username; List<Space> spaces; }
How to set an @AdditionalCriteria
on Post
to only return the posts that belongs to the spaces which the current user is a member of.
What I have tried so far are below.
#1 - :currentUserProfile in space.members
@AdditionalCriteria(":currentUserProfile in (this.space.members)")
Profile profile = new Profile();
em.setProperty("currentUserProfile", profile);
Results in:
Exception [EclipseLink-6015] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.QueryException
Exception Description: Invalid query key [space] in expression.
Query: ReadObjectQuery(name="readPost" referenceClass=Post )
#2 - :currentUserProfile member of space.members
@AdditionalCriteria(":currentUserProfile member of this.space.members")
Profile profile = new Profile();
em.setProperty("currentUserProfile", profile);
Results in:
Caused by: org.postgresql.util.PSQLException: Não pode inferir um tipo SQL a ser usado para uma instância de br.com.senior.social.model.profile.Profile. Use setObject() com um valor de Types explícito para especificar o tipo a ser usado.
at org.postgresql.jdbc.PgPreparedStatement.setObject(PgPreparedStatement.java:1039)
In english: "Could not infer a SQL type to use for an instance of _. Use setObject() with a explicit value of Types to set the type to be used."
#3 - this.space in profile.spaces
@AdditionalCriteria("this.space in (select p.spaces from Profile p where p.username = :currentUsername)")
String username = "foo";
em.setProperty("currentUsername", username);
Results in:
Exception [EclipseLink-0] (Eclipse Persistence Services - 2.6.2.v20151217-774c696): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Problem compiling [this.space in (select p.spaces from Profile p where p.username = :currentUsername)].
[131, 139] The state field path 'p.spaces' cannot be resolved to a collection type.
#4 - :currentUsername = (subselect)
@AdditionalCriteria(":currentUsername = (select p.username from Profile p where p.username = :currentUsername and this.space in (p.spaces))")
String currentUsername = "foo";
em.setProperty("currentUsername", currentUsername);
Results in:
org.postgresql.util.PSQLException: ERROR: relation "post" does not exist
Posição: 423
EclipseLink emits a SQL for the table without using the descriptor (prefix).
Solved it by using a not-so-elegant solution:
First, I added a raw ID attribute to the Post-Space relation:
class Post {
@Column(name = "SPACE_ID", updatable = false, insertable = false)
private String spaceId;
}
Then referenced it in the additional criteria:
@AdditionalCriteria("this.spaceId in :currentUserSpaceIds")
And initialized :currentUserSpaceIds
to the actual spaces that the current user is member of.
EntityManager em = ...;
Profile profile = ...; // current user profile
List<Space> spaces = profile.getSpaces();
List<String> spaceIds = new ArrayList<>();
for (Space space : spaces) { spaceIds.add(space.getId()); }
em.setProperty("currentUserSpaceIds", spaceIds);
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