StudentEnrollmentNew/StudentEnrollment/StudentEnrollmentDatabaseImplement/Implements/ExamPointsStorage.cs

using Microsoft.EntityFrameworkCore;
using StudentEnrollmentContracts.BindingModels;
using StudentEnrollmentContracts.SearchModels;
using StudentEnrollmentContracts.StorageContracts;
using StudentEnrollmentContracts.ViewModels;
using StudentEnrollmentDatabaseImplement.Models;

namespace StudentEnrollmentDatabaseImplement.Implements
{
	public class ExamPointsStorage : IExamPointsStorage
	{
        public List<ExamPointsViewModel> GetFullList()
        {
            using var context = new StudentEnrollmentDatabase();
            return context.exampoints
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public List<ExamPointsViewModel> GetFilteredList(ExamPointsSearchModel model)
        {
            if (!model.exampoints_id.HasValue)
            {
                return new();
            }
            using var context = new StudentEnrollmentDatabase();
            return context.exampoints
                .Where(x => model.exampoints_id.HasValue && x.exampoints_id == model.exampoints_id)
                .Select(x => x.GetViewModel)
                .ToList();
        }
        public ExamPointsViewModel? GetElement(ExamPointsSearchModel model)
        {
            if (!model.exampoints_id.HasValue)
            {
                return null;
            }
            using var context = new StudentEnrollmentDatabase();
            return context.exampoints
                .FirstOrDefault(x => model.exampoints_id.HasValue && x.exampoints_id == model.exampoints_id)?
                .GetViewModel;
        }
        public ExamPointsViewModel? Insert(ExamPointsBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var newExamPoints = ExamPoints.Create(model);
            if (newExamPoints == null)
            {
                return null;
            }
            context.exampoints.Add(newExamPoints);
            context.SaveChanges();
            return newExamPoints.GetViewModel;
        }
        public ExamPointsViewModel? Update(ExamPointsBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var examPoints = context.exampoints.FirstOrDefault(x => x.exampoints_id == model.Id);
            if (examPoints == null)
            {
                return null;
            }
            examPoints.Update(model);
            context.SaveChanges();
            return examPoints.GetViewModel;
        }
        public ExamPointsViewModel? Delete(ExamPointsBindingModel model)
        {
            using var context = new StudentEnrollmentDatabase();
            var element = context.exampoints.FirstOrDefault(rec => rec.exampoints_id == model.Id);
            if (element != null)
            {
                context.exampoints.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}