Controller: TrackGrandDetailsExampleController.cs

using SnapObjects.Data;
using Appeon.ApiDoc.Models.School;
using Microsoft.AspNetCore.Mvc;
using System.Linq;

namespace Appeon.ApiDoc.IDetailTrack
{
    public class TrackGrandDetailsExampleController : Controller
    {
        private readonly SchoolContext _dataContext;

        public TrackGrandDetailsExampleController(SchoolContext dataContext)
        {
            _dataContext = dataContext;
        }

        [HttpPost]
        public string Example(IDataUnpacker dataUnpacker)
        {
            // Uses IDataUnpack to receive JSON data from the client app.

            // Gets the data of Department, Course, and CourseStudent from the client app.
            var department = dataUnpacker
                            .GetModelEntries<DepartmentInfo>("departmentinfo")
                            .FirstOrDefault();

            var course = dataUnpacker
                         .GetModelEntries<CourseInfo>("courseinfo")
                         .FirstOrDefault();

            var courseStudent = dataUnpacker
                                .GetModelEntries<CourseStudentInfo>("coursestudent");

            // Saves data.
            var example = new IDetailTrackerExamples
                              .TrackGrandDetailsExample(_dataContext);
            example.Example(department, course, courseStudent);

            return "SUCCESS";
        }

    }
}

Refer To

JSON File: TrackGrandDetailsExample