EF7 Getting null values for entity's collection of entities which are many to many - asp.net-mvc

Question

I am getting null values for the collection of entities nested in my top entity. How do I properly write my LINQ query so that these values aren't null??
I am using Entity Framework 7 and MVC 6 Here are my classes:
My models:
public class WorkStation
{
public Id { get; set; }
public string Name{ get; set; }
public ICollection<PersonWorkStation> PersonWorkStations{ get; set; }
}
public class Person
{
public Id { get; set; }
public string FirstName { get; set; }
public ICollection<PersonWorkStation> PersonWorkStations{ get; set; }
}
public class PersonWorkStation
{
public int Id { get; set; }
public int PersonId { get; set; }
public Person Person { get; set; }
public int WorkStationId { get; set; }
public WorkStation WorkStation { get; set; }
}
My DbContext:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<PersonWorkStation>()
.HasKey(op => new { op.Id });
modelBuilder.Entity<PersonWorkStation>()
.HasOne(pt => pt.Person)
.WithMany(p => p.PersonWorkStation)
.HasForeignKey(pt => pt.PersonId);
modelBuilder.Entity<PersonWorkStation>()
.HasOne(pt => pt.WorkStation)
.WithMany(t => t.PersonWorkStation)
.HasForeignKey(pt => pt.WorkStationId);
base.OnModelCreating(modelBuilder);
}
So with that being said, when I bring back a person, and look at the "PersonWorkStation"s collection, the WorkStation property is null. How can I bring back that entity?
Here is how I am retrieving the data:
var person = _context.Persons
.Include(p => p.PersonWorkStation)
.FirstOrDefault(p => p.Id == 1);
return person;
Again, the person.PersonWorkStations.Workstation entity is null for all items in the person.PersonWorkStations collection. How do I return this entity?
Thanks!

Answer 1

I have found the answer, I needed to add this line:
var person = _context.Persons
.Include(p => p.PersonWorkStation)
.ThenInclude(p => p.WorkStation)
.FirstOrDefault(p => p.Id == 1);
return person;