consoleau / kotlin-jpa-specification-dsl Goto Github PK

https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/

Hi,

Wondering if there is any future plan to include JPA Criteria Treat()?
https://docs.oracle.com/javaee/7/api/javax/persistence/criteria/CriteriaBuilder.html#treat-javax.persistence.criteria.CollectionJoin-java.lang.Class-

Usage:
From our main entity, we are getting a field which is joined to another entity.
However, that entity is from abstract class and we wanted a field from that entity's base class.
e.g.
Accessing book's price and title

data class Store (
val book: BookInfo
)

abstract class BookInfo(
val id: Long
)

open class FictionBook(
val id: Long
val title: String
val price: String
) : BookInfo( id)
{
toInfo() =toBookInfo(id)
}

-this9is3me

Hi,

after I didn't get any feedback on my pull request (add variance) I added more freatures and put in into https://github.com/klinq/klinq-jpaspec.

Since this now has a good feature set (used in a couple of projects) - my question is if you want to integrate the changes back here.

If you are inerested, I can make a pull request.

I want to create subquery for many to many relation. How create subquery with kotlin jpa specification dsl?

First of all, thank you for making this, it is exactly what I was looking for.

I am trying to improve performance by using fetch joins. Using the Criteria API I would do something like this:
CriteriaQuery c = cb.createQuery(Person.class);
Root person = c.from(Person.class);
person.fetch("address");
c.select(person);

Any idea how this can be achieved using the DSL?

Thanks!

-Anders

Hello,

Officially, since yesterday (evening), the build started failing due to missing artifact, which I can confirm is no longer available in jcenter() (https://repo1.maven.org/maven2/au/com/), which is a problem...
The only place where it is available is Groovy Libs but that requires credentials + I am using Kotlin DSL so that might become a impediment (https://groovy.jfrog.io/ui/native/libs-release/au/com/console/).
Is there a workaround for this maybe? Or better yet, is there any chance that this artifact will be published somewhere else, accessible?

Thank you! :)

Type inference failed: inline fun <reified T> combineSpecification(specs: Iterable<Specification<T#1 (type parameter of app.foodin.entity.common.combineSpecification)>?>, operation: Specification<T#1>.(Specification<T#1>) -> Specification<T#1>): Specification<T#1>
cannot be applied to
(Iterable<Specification<T#2 (type parameter of app.foodin.entity.common.and)>?>,KFunction2<Specification<T#2>, @ParameterName Specification<T#2>, Specification<T#2>>)

When I build it, this error occurs.
I am using Kotlin 1.3.61 and spring boot 2.2.4

In Spring Data Moore / Spring Data JPA 2.2 the Specifications type was removed. In DATAJPA-1170 and DATAJPA-1449.

This breaks this library, but it should be rather easy to fix, simply replacing Specifications with Specification.

Additionally, there are @nullable annotations now in Specification.java, and thus it will be necessary to handle the nullable return types in Kotlin (with ? on the return type, or !! on the value).