Model Class: CourseAndOnlineInfo.cs

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using SnapObjects.Data;
using Newtonsoft.Json;
using System.Collections.Generic;

namespace Appeon.ApiDoc.Models.School
{
    /// <summary>
    /// This model class maps to the dbo.Course table. 
    /// It uses the primary key to generate the Where clause for the Update operation.
    /// 
    /// CourseID is the primary key.
    /// 
    /// The OnlineCourses property is applied with the ModelEmbedded attribute.
    /// The ModelEmbedded attribute defines the one-to-one relationship between the Course and 
    /// the OnlineCourse record.
    /// </summary>
    [Table("Course", Schema = "dbo")]
    [UpdateWhereStrategy(UpdateWhereStrategy.KeyColumns)]
    public class CourseAndOnlineInfo
    {
        [Key]
        public int CourseID { get; set; }

        public string Title { get; set; }

        public int Credits { get; set; }

        public int DepartmentID { get; set; }

        [JsonIgnore]
        [SetValue("$CourseID", "$CourseID", SetValueStrategy.Always)]
        [ModelEmbedded(typeof(OnlineCourse), ParamValue = "$CourseID", 
            CascadeCreate = true, CascadeDelete = true)]
        public OnlineCourse OnlineCourse { get; set; }
    }
}