one-to-many

问题 I have a simple one-to-many relationship in Django, for example: class Team(models.Model): team_mascot = models.CharField( max_length=200, null=True) class Player(models.Model): first_name = models.CharField(max_length=200, null=True) last_name = models.CharField(max_length=200, null=True) team = models.ForeignKey( 'players.Team', blank=True, null=True, on_delete=models.SET_NULL, related_name='players', related_query_name='player', ) On the Player admin page(s), I want to display some

问题 I start showing you my scenario. This is my parent object: @Entity @Table(name="cart") public class Cart implements Serializable{ @GeneratedValue(strategy=GenerationType.IDENTITY) @Id @Column(name="id") private Integer id; @OneToMany(mappedBy="cart", fetch = FetchType.EAGER, cascade = CascadeType.ALL) private List<CartItem> cartItems; ... } This is my child object: @Entity @Table(name="cart_item") public class CartItem implements Serializable{ @GeneratedValue(strategy=GenerationType.IDENTITY)

问题 I have 2 models: News Model TypeOfNew Model with (one to many relationship), every (TypeOfNew) has one or multiple news. News Model: public class News { [Required(ErrorMessage = "ID إجباري.")] [Key] public int ID { get; set; } [Required(ErrorMessage = "الحقل إجباري.")] [Display(Name = "عنوان الخبر")] public string Title { get; set; } [Required(ErrorMessage = "الحقل إجباري.")] [Display(Name = "مصدر الخبر")] public string Source { get; set; } [Required(ErrorMessage = "الحقل إجباري.")] [Display

来源： https://stackoverflow.com/questions/51308245/ef-core-2-1-self-referencing-entity-with-one-to-many-relationship-generates-add

来源： https://stackoverflow.com/questions/51308245/ef-core-2-1-self-referencing-entity-with-one-to-many-relationship-generates-add

来源： https://stackoverflow.com/questions/60001452/multiple-one-to-many-relations-in-gorm

来源： https://stackoverflow.com/questions/60001452/multiple-one-to-many-relations-in-gorm

来源： https://stackoverflow.com/questions/60001452/multiple-one-to-many-relations-in-gorm

来源： https://stackoverflow.com/questions/60001452/multiple-one-to-many-relations-in-gorm

来源： https://stackoverflow.com/questions/13940696/hibernate-two-onetomany-properties-mapped-by-the-same-entity-with-different-co