How can I delete a list of entity with RequestFactory?
InstanceRequest<List<XProxy>, Void> remove();
Of course, this is not working, because the first parameter has to be like this: P extends BaseProxy; but is there a similar way?
I want to delete the selected entities of my CellTable from the database. And I am using MultiSelectionModel, and CheckboxCell.
An InstanceRequest means that the method is an instance method on the domain method for the first type argument (similar to looking for a remove() on a List in what you tried).
You have to use a Request and pass the List as an argument to the method. The presence of a #ServiceLocator on the RequestContext will tell RequestFactory whether to look for a static or an instance method.
Request<Void> remove(List<XProxy> list);
Related
I want to append the query parameters list of a received UriInfo in a Rest service. The query comes from the client with some parameters and I need to add some more in server side.
I tried with:
uriInfo.getQueryParameters().add("Param", "value");
but when I display the URI, it doesn't has the new parameter.
On the other hand, if I do it like this:
URI uri = uriInfo.getRequestUriBuilder().queryParam("Param", "value").build();
when I display the URI, it contains the new parameter. The problem in this second case is to reconstruct a UriInfo object to give to the next functions, they require it.
I've seen that it cannot be instantiated, it has no constructors, it has to be added with #Context, its value can be updated by another UriInfo... but how to create this UriInfo with the URI I modified?
It is not possible to modify a UriInfo, there are no methods defined for that. The only option is to recreate it using one implementation of the interface. The only implementation available is org.jboss.resteasy.spi.ResteasyUriInfo.
The problem is that when deployed, and the function using it is called, it throws a ClassDefNotFound exception; even with a dependency in the manifest pointing to resteasy-jaxrs-2.3.2.Final.jar
So, the only option is to make our own implementation of the interface.
Briefly, I'm loading objects that descend from a base class using a repository defined against the base class. Although my objects are created with the correct descendant classes, any descendant classes that add navigation properties not present in the base class do not have those related objects loaded, and I have no way to explicitly request them.
Here is a simple method in a repository class that loads a given calendar event assuming you know its ID value:
public CalendarEvent GetEvent(int eventId)
{
using (var context = new CalendarEventDbContext(ConnectionString))
{
var result = (from evt in context.CalendarEvents
where eventId.Equals((int)evt.EventId)
select evt).ToList();
return result.ToList()[0];
}
}
CalendarEvent is a base class from which a large number of more specific classes descend. Entity Framework correctly determines the actual class of the calendar event specified by eventId and constructs and returns that derived class. This works perfectly.
Now, however, I have a descendant of CalendarEvent called ReportIssued. This object has a reference to another object called ReportRequest (another descendant of CalendarEvent, although I don't think that's important).
My problem is that when Entity Framework creates an instance of ReportIssued on my behalf I always want it to create and load the related instance of ReportRequested, but because I am creating the event in the context of generic calendar events, although I correctly get back a ReportIssued event, I cannot specify the .Include() to get the related object. I want to do it through this generically-expressed search because I won't necessarily know the type of eventId's event and also I have several other "Get" methods that return collections of CalendarEvent descendants.
I create my mappings using the Fluent API. I guess what I'm looking for is some way to express, in the mapping, that the related object is always wanted or, failing that, some kind of decorator that expresses the same concept.
I find it odd that when saving objects Entity Framework always walks the entire graph whereas it does not do the equivalent when loading objects.
I have an object that implements "IsTreeItem". The Object is displayed as a two level tree item. Each tree item is built with a check box.
I need to know when a check box is changing value - so i am listening to ValueChangedEvents.
The first problem is that the Tree built with such items only fires SelectionEvents. If selection is changing the check box the ValueChanged event is fired afterwards - so there is no way to listen to events inside "IsTreeItem" from Tree.
So i let my "IsTreeItem" fire its own element. So i (field)injected an EventBus and used it to fire the event if "ValueChanged".
The Problem is that my "IsTreeItem" is an Object sent from server (it is in shared package and serializable). The object is instantiated on server (EventBus is not ionjected) and "asTreeItem" is called on client.
Is there a way to inject the EventBus in the Method TreeItem asTreeItem() in some way? Or are there any other means to let some one outside know if a check box has changed its value.
GIN can do member injection on already created instances.
You have to create a method in your Ginjector interface that takes such an instance as argument, with a return type of void.
Note that because no reflection is done on the client, GIN will only inject fields and methods from the class used as the argument type (and its super-classes).
#GinModules(MyGinModule.class)
interface MyGinjector extends Ginjector {
…
void injectIsTreeItemMembers(IsTreeItem item);
}
I want to save a list of entity objects in RequestFactory. Most of the time, i can find
RequestContext with Save(EntityProxy) alone and not with Save(List of EntitProxy).
Is it possible to do in GWT ?
In your RequestContext, add a method like
Request<Void> save(List<MyEntityProxy> proxies);
and have that map to a method like
public void save(List<MyEntity> entities)...
in your service class.
This may need to be static, depending on how you are using locators, and what kind of Request you are using. If this isn't working, can you post the full RequestContext (including annotations) and the error that occurs? It might give a hint as to why it isn't working correctly.
I'm trying to bind a list/arraylist/hashmap/etc of custom objects to my form in JSP using Spring. Right now, the controller creates a Map of the two lists (Boolean list and custom object list) in referenceData(), and provides it to the form which uses those values to populate the fields. The values are initialized from a MySQL database using Hibernate, and all that works fine. The list is a known length before the form is initialized, so that part is easier. Now what I'd like to do is correctly bind those objects in the form, so that when there are changes made, I can detect that in onSubmit() (or wherever is appropriate), and update the database accordingly. I can't seem to bind them correctly in the form so that I can see changes made. I tried just using a list of the form fields as the model, but even that wasn't working correctly. Do I just need to inject the list in a particular way? Any ideas or examples here? Any help would be greatly appreciated.
UPDATE: At Ralph's request here is the solution I used:
In my data object class, I lazy loaded a map using MapUtils.lazyMap(), with a String key and other custom object value. The other custom object is just a class that contains List<String> and getters/setters. In the corresponding .jsp file, I just nest several loops to loop through the keys first using loop.current.key and then loop2.current.value.paramsList to loop through the values for that key. This was not really what I asked for in my original post, as I was looking for a more general solution, and the lazy loading pointed me in the right direction.
In Spring 2 you need a special List in your Command object, that is able to grow if one add the x-th element event if the list has not this size yet.
One way to do that is to use LayzList decorator from commons-collections.
#Override
protected Object formBackingObject(final HttpServletRequest request)
throws Exception {
List<PosterSelectionRow> posterSelectionRowList = LazyList.decorate(
new ArrayList<PosterSelectionRow>(),
new PosterSelectionRowListFactory());
return new PosterSelectionCommand(posterSelectionRowList);
//PosterSelectionCommand contains a list of selected poster rows
}
private static class PosterSelectionRowListFactory
implements org.apache.commons.collections.Factory {
/** Invoked if the list need a new element */
public Object create() {
return = new PosterSelectionRow();
}
}
When I remember right, there is a way without that Factory stuff, but I am not sure.