Entity Framework Core Query Specific Model both directions - asp.net

Question

Let me preface this question with, I am VERY new to ASP.NET Core/EF Core.
My model look like this:
namespace MyProject.Models
{
public class DeviceContext : DbContext
{
public DeviceContext(DbContextOptions<DeviceContext> options) : base(options) { }
public DbSet<Device> Devices { get; set; }
public DbSet<DeviceLocation> DeviceLocations { get; set; }
}
public class Device
{
public int Id { get; set; }
public string DeviceName { get; set; }
public string ServerName { get; set; }
public string MacAddress { get; set; }
public string LastUpdate { get; set; }
public string WiredIPAddress { get; set; }
public string WirelessIPAddress { get; set; }
public DeviceLocation DeviceLocation { get; set; }
}
public class DeviceLocation
{
public int Id { get; set; }
public string Location { get; set; }
public virtual ICollection<Device> Devices { get; set; }
}
}
I would like to be able to fetch a specific Device based on DeviceName, but I would also like to fetch ALL the devices in a particular Location.
I think the following would work for the first question:
var _Devices = DeviceContext.Devices.FirstOrDefault(d => d.DeviceName == "BLA");
I am just having a hard time getting the second query to run. Ideally, the output would be rendered to JSON to be consumed by an API. I would like the output to look something like this:
{
"Locations": {
"NYC": ["ABC", "123"],
"Boston": ["DEF", "456"],
"Chicago": ["GHI", "789"]
}
}
UPDATE
If I use the following code, it give me the following error:
Code:
// Grouping by ProfileName
var devices = DeviceContext.DeviceLocations.Include(n => n.Device).ToList();
var result = new { success = true, message = "Successfully fetched Devices", data = devices };
return JsonConvert.SerializeObject(result);
Error:
Additional information: Self referencing loop detected for property 'DeviceLocation' with type 'Project.Models.DeviceLocation'. Path 'data[0].Device[0]'.

Answer 1

You can try as shown below.
Note : Use Eager Loading with Include.
using System.Data.Entity;
var devicesList = DeviceContext.DeviceLocations.Where(d=>d.Location = "Your-Location-Name")
.Include(p => p.Devices)
.ToList();
Update :
var devicesList = DeviceContext.DeviceLocations
.Include(p => p.Devices)
.ToList();