104 lines
3.8 KiB
C#
104 lines
3.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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using System.ComponentModel.DataAnnotations.Schema;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using UniversityContracts.BindingModels;
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using UniversityContracts.ViewModels;
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using UniversityDataModels.Models;
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namespace UniversityDatabaseImplement.Models
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{
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public class Discipline : IDisciplineModel
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{
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public int Id { get; private set; }
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[Required]
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public int TeacherId { get; private set; }
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[Required]
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public string Name { get; private set; } = string.Empty;
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[Required]
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public string Description { get; private set; } = string.Empty;
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public virtual Teacher Teacher { get; set; } = new();
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private Dictionary<int, IStudentModel>? _studentDisciplines = null;
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[NotMapped]
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public Dictionary<int, IStudentModel> StudentDisciplines
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{
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get
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{
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if (_studentDisciplines == null)
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{
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_studentDisciplines = Students
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.ToDictionary(recPC => recPC.StudentId, recPC => recPC.Student as IStudentModel);
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}
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return _studentDisciplines;
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}
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}
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[ForeignKey("DisciplineId")]
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public virtual List<StudentDiscipline> Students { get; set; } = new();
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public static Discipline Create(UniversityDatabase context, DisciplineBindingModel model)
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{
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return new Discipline()
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{
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Id = model.Id,
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TeacherId = model.TeacherId,
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Name = model.Name,
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Description = model.Description,
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Students = model.StudentDisciplines.Select(x => new
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StudentDiscipline
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{
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Student = context.Students.First(y => y.Id == x.Key)
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}).ToList()
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};
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}
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public void Update(DisciplineBindingModel model)
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{
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if (model == null)
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{
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return;
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}
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Id = model.Id;
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TeacherId = model.TeacherId;
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Name = model.Name;
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Description = model.Description;
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}
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public void UpdateStudents(UniversityDatabase context,
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DisciplineBindingModel model)
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{
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var studentDisciplines = context.StudentDisciplines.Where(rec => rec.DisciplineId == model.Id).ToList();
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if (studentDisciplines != null && studentDisciplines.Count > 0)
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{ // удалили те, которых нет в модели
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context.StudentDisciplines.RemoveRange(studentDisciplines.Where(rec
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=> !model.StudentDisciplines.ContainsKey(rec.StudentId)));
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context.SaveChanges();
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// обновили количество у существующих записей
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foreach (var updateStudent in studentDisciplines)
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{
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model.StudentDisciplines.Remove(updateStudent.StudentId);
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}
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context.SaveChanges();
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}
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var discipline = context.Disciplines.First(x => x.Id == Id);
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foreach (var pc in model.StudentDisciplines)
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{
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context.StudentDisciplines.Add(new StudentDiscipline
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{
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Discipline = discipline,
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Student = context.Students.First(x => x.Id == pc.Key)
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});
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context.SaveChanges();
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}
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_studentDisciplines = null;
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}
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public DisciplineViewModel GetViewModel => new()
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{
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Id = Id,
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TeacherId = TeacherId,
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Name = Name,
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Description = Description,
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StudentDisciplines = StudentDisciplines,
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};
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}
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}
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