Select in multiple tables using EFCore - mysql

Question

I have the MySql tables schema below (resumed):
I need to Select only the category data in a Query using EFCore:
List<CategoryViewModel> viewModel = await _context.Category
.Join(_context.Product_Category, c => c.CategoryId, pc => pc.CategoryId, (c, pc) => new { c, pc })
.Join(_context.Product, cpc => cpc.pc.ProductId, p => p.ProductId, (cpc, p) => new { cpc, p })
.Where(cpcp => cpcp.p.EstablishmentId == paramEstablishmentId) //paramEstablishmentId comes via parameter
.Select(vm => new CategoryViewModel()
{
Id = vm.cpc.pc.category.CategortId,
Name = vm.cpc.pc.category.Name,
Image = vm.cpc.pc.category.ImagePath,
Description = vm.cpc.pc.category.Description
})
.ToListAsync();
But this query always result a list with zero models inside. I guarantee there are values in the database to be returned.
Any Ideia what i'm doing wrong?
Many Thanks!

Answer 1

You should use Include()function instead of join. For eg :
var blogs = context.Blogs
.Include(blog => blog.Posts)
.ToList();

Answer 2

Based on #Flyzzx Answer (many thanks, friend), i've modify my query to:
List<CategoryViewModel> viewModel = await _context.Product_Category
.Where(pc => pc.Product.EstablishmentId == EstablishmentId)
.Include(pc => pc.Product)
.Include(pc => pc.Category)
.Select(c => new CategoryViewModel()
{
Id = c.Category.Id,
Name = c.Category.Name,
Image = c.Category.ImagePath,
Description = c.Category.Description
}).Distinct()
.ToListAsync();
Basically, instead of select Categories, now i select Product_Category and use Include to add Products and Categories, making possible to use the Where Clause.