I am coding a searching so I am using Specification to do it.
I have a relationchip beetwin tow tables (ManytoMany) like this:
public class Productos implements Serializable {
.
.
.
@JoinTable(name = "PRODUCTOS_CATEGORIAS", joinColumns = {
@JoinColumn(name = "PRODUCTOS_PROD_ID", referencedColumnName = "PROD_ID")}, inverseJoinColumns = {
@JoinColumn(name = "CATEGORIAS_CATE_ID", referencedColumnName = "CATE_ID")})
@ManyToMany
private Collection<Categorias> categoriasCollection;
The data I have it the "CATE_ID" tha id in "Categoria" is call "cateId".
I need to know how to build the criteriaBuilder to add to the predicates in the previous case when I have manyToMany relationchip.
This is my code:
public class ProductosSpecification {
public Specification<Productos> getProductos(BuscaProductosDto buscaProductosDto) {
return (root, query, criteriaBuilder) -> {
List<Predicate> predicates = new ArrayList<>();
if (buscaProductosDto.getCategoria() != null && buscaProductosDto.getCategoria() != 0) {
------ HERE IS WHEN I NEED TO DO THE RIGHT WAY WHEN IS MANYTOMANY
Join<Productos, Categorias> join = root.join("categoriasCollection", JoinType.INNER);
predicates.add(criteriaBuilder.equal(join.get("name").as(String.class), buscaProductosDto.getCategoria()));
predicates.add(criteriaBuilder.equal(root.get("categoriasCollection").get("cateId"), buscaProductosDto.getCategoria()));
------------------
}
if (buscaProductosDto.getValorDesde() != null && buscaProductosDto.getValorHasta() != null && buscaProductosDto.getValorHasta() != 0) {
predicates.add(criteriaBuilder.between(root.get("prodValor"), buscaProductosDto.getValorDesde(), buscaProductosDto.getValorHasta()));
}
if (buscaProductosDto.getLocalidad()!= null && buscaProductosDto.getLocalidad()!= 0) {
predicates.add(criteriaBuilder.equal(root.get("emprId").get("locaId").get("locaId"), buscaProductosDto.getLocalidad()));
}
if (buscaProductosDto.getAglomeracion()!= null && buscaProductosDto.getAglomeracion()!= 0) {
predicates.add(criteriaBuilder.equal(root.get("emprId").get("agloId").get("agloId"), buscaProductosDto.getAglomeracion()));
}
query.orderBy(criteriaBuilder.desc(root.get("experience")));
return criteriaBuilder.and(predicates.toArray(new Predicate[0]));
};
}
}
I will apresiate your help.
