Include and ThenInclude with multiple levels of collections

Question

I am trying to query an entity with multiple levels of collections, and multiple collections at a single level. I'm using Include() and ThenInclude(), but not having much success. The examples I find don't have multiple collections on the same level and I haven't had any luck applying the technique to my use case.

This is a simplified illustration of my entities. Those with the [] are collections:

Home
   Areas[]
       Area
           Name
           Categories[]
               Name
               Recommendations[]
               Subcategories[]
                   Name
                   Recommendations[]
       Area
           Name
           Categories[]
               Name
               Recommendations[]
               Subcategories[]
                   Name
                   Recommendations[]   

I've gotten this far:

result = Home
    .Include(x => x.Areas)
    .ThenInclude(a => a.Categories)
    .ThenInclude(c => c.Subcategories)
    .ThenInclude(s => s.Recommendations)

However, this misses the Categories[].Recommendations[] collection. It's because there are two collections at the same level (Recommendations[] and Subcategories[]).

Any suggestions for a way to structure this query so I can get the desired result?

Thanks.

Answer 1

You have to call Include for each level:

result = Home
    .Include(x => x.Areas)
        .ThenInclude(a => a.Categories)
        .ThenInclude(c => c.Subcategories)
        .ThenInclude(s => s.Recommendations)
    .Include(x => x.Areas)
        .ThenInclude(a => a.Recommendations)