Get products recursively with DataService from top category

Questions
1

Let’s say I want to get all products recursively with DataService, similar to setting “CategoryShowRecursively” to true in SearchQuery in ProductSearchService. Is this possible?

Litium version: 8.2.1

2

I’m not sure if there’s a way to do it in a single call, but there’s an extension for getting all categories recursively. You can then query for products from that result. In total, 2 direct calls to the database.

Something like:

using (var query = _dataService.CreateQuery<Category>())
{
    query.Filter(f => f.ParentCategorySystemId(parentCategorySystemId, true));
    using (var productQuery = _dataService.CreateQuery<BaseProduct>())
    {
        var products = productQuery.Filter(f => f.Bool(b => b.Should(x =>
        {
            foreach (var categorySystemId in query.ToSystemIdList())
            {
                x.ContainsInCategory(categorySystemId);
            }
        }))).ToList();
    }
}

You can do the query on Variants as well by changing the type to Variant and using x.ActiveInCategory(...). This would exclude products where the URL is on the base product.