In Orchard, how to query based on current user's content picker field? - orchardcms

Question

I have extended the built-in User ContentType with a Content Picker Field that can be used to select multiple Video ContentItems. This gives me a video multi-picker control on the Edit page of each User.
I love how Orchard CMS makes this so elegantly simple to setup.
Now that I can associate multiple Videos with a User, I'd like to create a Query that will display just the Videos that the currently logged in User has been granted access.
I was hoping to be able to setup a Query using the Projector module, in what I thought was the obvious way (see below), but this returns no results.
This is how I configured the second filter:
Clicked on the + Add a new Filter link on the Edit Query screen
Chose Videos:Ids from the User Content Fields section, like this:
Configured the new filter like this:
What am I doing wrong, or what is the simplest way of diagnosing this issue?
This is how the Content Picker field is defined:

Answer 1

I have spotted my error - it was due to me not having a proper understand of how the filters worked. The Videos:Ids filter in the User Content Fields section does not give access to the current user's list of videos, as I assumed. Instead, it is offering the field to be used in the filter, which would be useful if I were to write a query to produce a list of Users that had access to a specific Video.
It was wishful thinking that it worked the way I wanted, but it's obvious in retrospect how it actually works.
Update: in the hope it's useful for others, here's the custom filter I developed:
public interface IFilterProvider : IEventHandler
{
void Describe(dynamic describe);
}
public class CurrentUserVideosFilter : IFilterProvider
{
private readonly IWorkContextAccessor _workContextAccessor;
public CurrentUserVideosFilter(IWorkContextAccessor workContextAccessor)
{
_workContextAccessor = workContextAccessor;
T = NullLocalizer.Instance;
}
public Localizer T { get; set; }
public void Describe(dynamic describe)
{
describe.For("My Filter Category", T("My Filter Category"), T("My Filter Category"))
.Element("Current User's Videos", T("Current User's Videos"), T("Current User's Videos"),
(Action<dynamic>)ApplyFilter,
(Func<dynamic, LocalizedString>)DisplayFilter,
null
);
}
public void ApplyFilter(dynamic context)
{
var query = (IHqlQuery)context.Query;
context.Query = query.ForType("Video")
.Where(x => x.ContentPartRecord<IdentityPartRecord>(), x => x.InG("Id", GetVideoIdsForCurrentUser()));
}
private IList<int> GetVideoIdsForCurrentUser()
{
var currentUser = _workContextAccessor.GetContext().CurrentUser;
if (currentUser == null) return new int[0];
dynamic item = currentUser.ContentItem;
var videoContentItems = (IEnumerable<ContentItem>)item.User.Videos.ContentItems;
return videoContentItems.Select(i => i.Id).ToList();
}
public LocalizedString DisplayFilter(dynamic context)
{
return T("Videos that have been assigned to the currently logged in user");
}
}
I created this class in a new Orchard module, which contains all my customisations for the site I'm building. Once I installed the module, the filter was immediately available. I assume Orchard uses reflection to seek out all types that implement the IFilterProvider interface.
This is how the filter appears on the Add a Filter screen:
Clicking on the filter shows this screen:
Once the filter has been saved, the query works exactly how I'd like - it shows all videos that have been assigned to the currently logged in user.