"Cannot get unfetched attribute from detached object" after initNewItem

Support
#1

Hi,
I’m using the initNewItem to populate entities with composition in an edit screen controller.
I also have a table with the nested groupDatasource, and I’m using on the owning Entity a view with contains all the needed attributes to populate the table. It works fine on editing an existing Entity, but on Entity creation I get the error in the title.
Basically, it looks like the fetching setup in the view doesn’t work when the new sub-entitites are created with initNewItem. Should I manually fetch the related entities in the initNewItem?

IllegalStateException error
#2

Hi Paolo,

Views are used only in the process of loading entities from the database and they don’t affect instances just created in memory. In a new instance all attributes can be set.

Could you reproduce your problem on a small test project?

1 Like
#3

Hi Konstantin,
just to be sure I’m getting it right before making a test project. I need to fetch several related entities to set a column in the table containing newly created instances. This happens automatically using the view when editing an instance, but how am i supposed to manually fetch the related entities after initNewItem?

#4

Paolo,

If you need some reference entities to set attributes of your new entities, you can use DataManager to load them at any time. Sorry if I still don’t understand your situation.

#5

I’m already setting the attribute, what I need is the table to “traverse” that attribute to fetch another attribute.

Like so:
containedNewItem.getAttribute().getAnotherAttribute().getAttributeToBeShownInTable()
I tried manually fetching all the intermediate entities with the dataManager, but I get the same error.
BTW I’m preparing a project to demonstrate this

#6

I’m attaching the project. Steps to reporudce:

  • make at least 1 Definition1 instance
  • make some Definition2 instances. Each one has a many-to-one relationship with Definition1
  • try to make a ContainerEntity. It will trigger this code:

    @Override
    protected void initNewItem(ContainerEntity containerEntity) {
        Set<ContainedEntity> items = new HashSet<>();
        for (Definition2 definition : getAllDefinitions()) {
            ContainedEntity containedEntity = metadata.create(ContainedEntity.class);
            containedEntity.setContainerEntity(containerEntity);
            containedEntity.setDefinition(definition);
            containedEntity.setName("name test");
            items.add(containedEntity);
        }
        containerEntity.setItems(items);
    }

    private ArrayList<Definition2> getAllDefinitions() {
        LoadContext.Query query = LoadContext.createQuery("select e from compositiontest$Definition2 e");
        return new ArrayList<Definition2>(dataManager.loadList(LoadContext.create(Definition2.class).setQuery(query)));
    }

compositionTest.zip (366.8K)

#7

Hi Paolo,

Just specify a view when loading entity:


    private ArrayList<Definition2> getAllDefinitions() {
        LoadContext.Query query = LoadContext.createQuery("select e from compositiontest$Definition2 e");
        LoadContext<Definition2> loadContext = LoadContext.create(Definition2.class)
                .setQuery(query)
                .setView("definition2-view"); // defines the object graph to load
        return new ArrayList<Definition2>(dataManager.loadList(loadContext));
    }
#8

Thank you very much. I was misleaded by trying to set the view on the item instead of the Definition2, to replicate the screen normal behaviour