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Ebean not persisting foreign keys


Ebean not persisting foreign keys

By : user2957688
Date : November 24 2020, 01:01 AM
it fixes the issue I have a simple Entity class like; , There are some innacuracies in provided code. There is
code :
logo.place = newPlace
@Entity
class Place( var aId: Int, var aNumber: String) extends Model{

    @Id
    val id:Int=aId

    @Column(name="number")  
    var number: String = aNumber

    @OneToOne
    @JoinColumn (name = "logo_id") 
    var logo: Image = _

    @OneToOne
    @JoinColumn(name = "cover_id")
    var cover: Image = _
}
@Entity
@Table(name = "image")
class Image(var aId: Int, var aCaption: String) extends Model {

    @Id
    val id:Int=aId

    @Column(name="caption")
    var caption: String = aCaption
}
"EbeanTest" should {
    "placeTest" in new WithApplication {

        val newPlace = new Place(1, "aaa")
        newPlace.save

        val logo: Image  = new Image(1, "111");
        logo.save

        val cover: Image  = new Image(2, "222");
        cover.save

        newPlace.logo=logo
        newPlace.cover=cover
        newPlace.update


        val cList = Ebean.find(classOf[Place]).findList()
        for (
            element <- cList
        ) println(element.id+" "+element.number+" "+element.logo.id+" "+element.cover.id)           
    }
}


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Entity Framework 4 - Persisting Child Objects using only foreign keys

Entity Framework 4 - Persisting Child Objects using only foreign keys


By : user3036917
Date : March 29 2020, 07:55 AM
hop of those help? I have a many to many relationship in my EF4 model (many groups can have many programs). , Use a trick with dummy classes:
code :
// you have a group
var group = GetGroupSomehow();
// if group is unknown to the context Attach it
context.Groups.Attach(group); // if it is a new group use AddObject
// now add programs
foreach(var program in programId.Select(id => new Program { Id = id }))
{
    // Attach dummy program first
    context.Programs.Attach(program);
    // Now make relation between group and program
    group.Programs.Add(program);
} 

context.SaveChanges();
Persisting related entities in Symfony correctly (Foreign Keys)

Persisting related entities in Symfony correctly (Foreign Keys)


By : vkumarg3
Date : March 29 2020, 07:55 AM
Persisting a table with foreign keys using EJB and JPA

Persisting a table with foreign keys using EJB and JPA


By : leefj
Date : March 29 2020, 07:55 AM
this will help I fixed it. If you look at the code for servlet, it was the problem with my if condition that checks the action parameter. It was meant to be if action is not empty but it checks if action is empty. I found this issue by creating an integer that increments itself when it reaches certain stages within the code.
I think you were right on the fact that I had to do the getting property id and buyer id on the same transaction. Otherwise that would have been the next issue for me. Thank you.
Safely persisting django models with foreign keys

Safely persisting django models with foreign keys


By : blue
Date : March 29 2020, 07:55 AM
seems to work fine You may want to use a transaction so that you can enforce an "everything gets saved or nothing does" type of behavior. This would be the safest approach in my opinion.
Ebean - Composite primary key which contains foreign keys

Ebean - Composite primary key which contains foreign keys


By : THjelm
Date : March 29 2020, 07:55 AM
it fixes the issue Some annotations does not seem right but could work anyway.
If I were you I would do:
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