Help with IndexProvider

[vitalybrandes]

I need to create index for ContentItem once its saved from the admin UI.
I create

 public class UserByPrinterIndexProvider : IndexProvider<ContentItem>
    {
        public override void Describe(DescribeContext<ContentItem> context)
        {
            context.For<UserByPrinterIndex>()
             .Map(contentItem =>
             {
                 var printer = contentItem.As<Printer>();

                 if (printer == null)
                 {
                     return null;
                 }

                 var results = new List<UserByPrinterIndex>();

                 //for each selected printer create index
                 foreach (string user in printer.Content.Printer.Users.UserNames)
                 {
                     results.Add(new UserByPrinterIndex
                     {
                         PrinterId = printer.PrinterId.Text,
                         PrinterContentItemId = contentItem.ContentItemId,
                         UserName = user,
                     });
                 }
                 return results;
             });
        }
    }

How cat i run it once content item created, updated, deleted?

[deanmarcussen]

Did you register it with dependency injection?

services.AddSingleton<IIndexProvider, UserByPrinterIndexProvider >();

That should be all you need to do.

[vitalybrandes]

Did you register it with dependency injection?

services.AddSingleton<IIndexProvider, UserByPrinterIndexProvider >();

That should be all you need to do.

Yes, I did that 😩.
I feel that I miss something...
Do I need to create driver or something?
How indexprovider executed if I save the content item (Printer) via Admin Publish Content item btn?

[jtkech]

Did you create your index table through a DataMigration, as done e.g. by the OC.Autoroute module in its Migrations.cs file?

[vitalybrandes]

Yes I did.

  public int Create()
        {
            SchemaBuilder.CreateMapIndexTable<UserByPrinterIndex>(table => table
                 .Column<string>(nameof(UserByPrinterIndex.PrinterId))
                 .Column<string>(nameof(UserByPrinterIndex.PrinterContentItemId))
                 .Column<string>(nameof(UserByPrinterIndex.UserName))
             );
            return 1;
        }

[jtkech]

Did you register it ;)

        services.AddScoped<IDataMigration, Migrations>();

[vitalybrandes]

I did and now i even see that that table was created but not populated.

[jtkech]

No luck ;)

Need to leave soon, but can you share your full code so that someone will review it

[vitalybrandes]

@jtkech

Its problem to share the code :-(
but ill try to explain here what i did:

At one of my modules I create migration file :

 public class PrinterByCompaniesMigration : DataMigration
    {
        public int Create()
        {
            SchemaBuilder.CreateMapIndexTable<PrinterByCompaniesIndex>(table => table
                 .Column<string>(nameof(PrinterByCompaniesIndex.Company))
                 .Column<string>(nameof(PrinterByCompaniesIndex.CompanyContentItemId))
                 .Column<string>(nameof(PrinterByCompaniesIndex.PrinterId))
                 .Column<string>(nameof(PrinterByCompaniesIndex.PrinterContentItemId))
             );
            return 1;
        }
}

The table create in db successfully!
as well i created PrinterByCompaniesIndexProvider

   public class PrinterByCompaniesIndex : MapIndex
    {
        public string Company { get; set; }
        public string CompanyContentItemId { get; set; }
        public string PrinterId { get; set; }
        public string PrinterContentItemId { get; set; }
    }

    public class PrinterByCompaniesIndexProvider : IndexProvider<ContentItem>
    {
        public override void Describe(DescribeContext<ContentItem> context)
        {
            context.For<PrinterByCompaniesIndex>()
             .Map(contentItem =>
             {
                 var company = contentItem.As<Company>();

                 if (company == null)
                 {
                     return null;
                 }
                 var results = new List<PrinterByCompaniesIndex>();
                 foreach (var printer in company.Content.Printer)
                 {
                     results.Add(new PrinterByCompaniesIndex
                     {
                         Company = company.CompanyName.Text,
                         CompanyContentItemId = company.ContentItem.ContentItemId,
                         PrinterId = printer.ContentItem.DisplayText,
                         PrinterContentItemId = printer.ContentItem.ContentItemId,
                     });
                 }
                 return results;
             });
        }
    }

Both registered in starup.cs

            services.AddSingleton<IIndexProvider, PrinterByCompaniesIndexProvider>();
            services.AddScoped<IDataMigration, PrinterByCompaniesMigration>();

What i expect is, while i am creating, updating or deleting item from admin : Content -> ContentItems page
that this index will be updated.
This not happen :-(

[jtkech]

First, can you put a breakpoint to see if it is executed

Then if contentItem.As<Company>() is not null

So i assume that Company is a content part

Oops just saw your question

Do I need to create driver or something?

Yes or another advanced way to weld / apply your part data to a content item and save it, but the regular way is to implement and register a contentpart specifying the driver that needs to be used, and let the content management coordinate all the things, about parts / drivers / handlers there are many examples in the source code, how there are registered and used.

Currently how are you saving some Company data?

Finally if company.Content.Printer is not an empty collection

[vitalybrandes]

I found the problem, than you!