Why are you assigning
shop.products = products;
shouldn't you do
shop.products.add(products); ?
Question
My view add.scala.html is this
So if i add a product it shows on same screen and i have a delete button to delete product.My problem is that when i add new product it works fine but when i add a new product after deleting any one then it gives me the error
[PersistenceException: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`shopdb`.`product_shop`, CONSTRAINT `fk_product_shop_product_01` FOREIGN KEY (`product_id`) REFERENCES `product` (`id`))]
on my models.Product.java
public static Product create(Product product,Shop shop) {
product.save();
static List<Product> products = new ArrayList<>();
products.add(product);
shop.products = products;
shop.save();//getting error on this line
return product;
}
public static void delete(Long id) {
find.ref(id).delete();
}
my database
create table product (
id bigint auto_increment not null,
name varchar(255),
price float,
category varchar(255),
constraint pk_product primary key (id))
;
create table shop (
id bigint auto_increment not null,
name varchar(255),
address_line1 varchar(255),
address_line2 varchar(255),
address_line3 varchar(255),
city varchar(255),
town varchar(255),
phone_number varchar(255),
category varchar(255),
shop_pic longblob,
owner_id bigint,
constraint pk_shop primary key (id))
;
create table product_shop (
product_id bigint not null,
shop_id bigint not null,
constraint pk_product_shop primary key (product_id, shop_id))
;
alter table product_shop add constraint fk_product_shop_product_01 foreign key (product_id) references product (id) on delete restrict on update restrict;
alter table product_shop add constraint fk_product_shop_shop_02 foreign key (shop_id) references shop (id) on delete restrict on update restrict;
Any help would be really appreciated.
La solution
Why are you assigning
shop.products = products;
shouldn't you do
shop.products.add(products); ?