one-to-many

I have a basic one to many relation parent / child like in the chapter 21 of Hibernate references book. The cascade is only from child to parent (persist cascade only because I don't want to delete the parent if I delete a child). When I add a child to the parent and I save the child, I have a TransientObjectException... @Entity public class Parent implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @OneToMany(mappedBy = "parent", orphanRemoval = true) private List<Child> childs; public List<Child> getChilds() { return childs; } public void setChilds

Say I have a couple objects, having a one-to-many relationship, something like class Parent(): //id, other cols, etc children = relationship("Child", backref="parent") class Child(): parent_id = Column(Integer, ForeignKey("parent.id") child_type = Column(Enum("a","b")) Now, I want to query Parent objects, but have their children filtered by child_type, ie something like session.query(Parent).join(Parent.children).filter(Child.child_type == "a") This just returns the Parent with all the children, basically disregarding the filter. Is this result at all possible or do I have to also query Child?

Let's say I have the following situation: Object Car has an ArrayList of prices, which are all numbers. Is it possible in Hibernate to save all the prices in a single column? I know this violates the first normal form but there might be cases when you don't want them to be saved in a separate table like it's classically done in One-To-Many or Many-To-Many relationships. In JDO I'd do this easily by saving the ArrayList in a BLOB column. Some useful related SOF questions: ArrayList of primitive types in Hibernate and Map ArrayList with Hibernate . Any idea will be highly appreciated! Chris

I am trying to set up some ManyToOne/OneToMany relationships on objects in my database using Doctrine (2.2.3+) via Symfony2 (2.3.0) and am getting a strange error. Here are the relevant parts of the objects (many attributes to one product): /** * Product * * @ORM\Table(name="product") * @ORM\Entity */ class Product { /** * @var integer * * @ORM\Column(name="id", type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ protected $id; ... /** * * @OneToMany(targetEntity="ProductAttributes", mappedBy="product") */ protected $product_attributes; public function __construct() { $this-

I have created on2many field in class A and other field nombre (integer): 'Inventaire' : fields.one2many('class.b','id_classb'), 'nombre' : fields.integer('Nombre'), In class b : 'id_classb' : fields.many2one('class.a', 'ID_classA'), 'ql' : fields.integer('QL'), I want to create a function in class a that create records for object b according to the value of nombre field. for example if nombre =3 I should create 3 object of class b here is my function: def save_b(self, cr, uid, ids, field_name, arg, context): a= self.browse(cr, uid, id) nbr=a.nombre num=22 for i in range(nbr): num+=1 self

I'm have a problem embedding forms from different entities in one form, my form is being displayed with firstname [input] lastname [input] address - but the address has no input next to it. Basically I want to create a form where the user can add first name, last name, address1, address2, city, country ect and submit it it as one, although it's different tables. The main form is no problem the only issue I'm having is with the second embedded form. Any help would be greatly appreciated. Here is my code: Member class: namespace Pomc\MembersBundle\Entity; use Doctrine\ORM\Mapping as ORM; /** *