many-to-one

According to book Pro JPA 2 the main difference between unidirectional @ManyToOne and @OneToOne is that in @OneToOne: Only one instance of the source entity can refer to the same target entity instance. In other words, the target entity instance is not shared among the source entity instances. In the database, this equates to having a uniqueness constraint on the source foreign key column (that is, the foreign key column in the source entity table). The thing is, when I create such a mapping on entity and let Hibernate create schema, there is no unique constrain created at all. Why? Because of

I know this question has been asked a lot, but I read almost every one of them but non of them helped me. I'm writing an eclipse maven project with hibernate and I'm getting this error: org.hibernate.InvalidMappingException: Could not parse mapping document from resource ir/ac/ut/ieproj/da/Student.hbm.xml my files are like this: pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>ir.ac.ut<

User have n Contacts. A Contact can have a localized Comment (Comments are shared between Contacts). Java Beans: @Audited @Entity public class User { @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true) Set<Context> contacts; } @Audited @Entity public class Contact { @ManyToOne(fetch = FetchType.EAGER, cascade = { CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH}) Comment comment; } @Audited @Entity public class Comment { String de; String en; String fr; } If I change the german localization (Comment.de) of a contact (Contact.comment) then this will

I am trying to persist a one-to-many and a many-to-one relation using Hibernate 4.1.1 but the foreign key is always NULL . There are two entities: Account and Client . A Client could have multiple Accounts while an Account has exactly one Client . Here are the classes (only what matters): Account.java @Entity @Table(name = "account") public class Account implements Serializable { private Client client; @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") public long getId() { return id; } @ManyToOne @JoinColumn(name = "id_client") public Client getClient() { return client;

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

Please advice me How to remove "Create and Edit..." from many2one field.? that item shows below in the many2one fields which I filtered with domain option. OpenERP version 7 Sudhir Arya I don't have much idea. Maybe for that you have to make changes in web addons. But an alternative solution is that you can make that many2one field selection . Add widget="selection" attribute in your xml. <field name="Your_many2one_field" widget="selection"> Many2one widget (default) Options : Other possible options you can use with this widget. no_quick_create - It will remove Create and edit... option. no