backend/ExamKing.Application/Services/CourseService.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using ExamKing.Application.ErrorCodes;
using ExamKing.Application.Mappers;
using ExamKing.Core.Entites;
using Furion.DatabaseAccessor.Extensions;
using Furion.DatabaseAccessor;
using Furion.DependencyInjection;
using Furion.FriendlyException;
using Mapster;
using Microsoft.EntityFrameworkCore;

namespace ExamKing.Application.Services
{
    /// <summary>
    /// 课程服务
    /// </summary>
    public class CourseService : ICourseService, ITransient
    {
        private readonly IRepository<TbCourse> _courseRepository;

        /// <summary>
        /// 依赖注入
        /// </summary>
        public CourseService(IRepository<TbCourse> courseRepository)
        {
            _courseRepository = courseRepository;
        }

        /// <summary>
        /// 分页查询课程
        /// </summary>
        /// <param name="pageIndex"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        public async Task<PagedList<CourseDto>> FindCourseAllByPage(int pageIndex = 1, int pageSize = 10)
        {
            var pageResult = await _courseRepository
                .Entities.AsNoTracking()
                .Select(u => new TbCourse
                {
                    Id = u.Id,
                    CourseName = u.CourseName,
                    DeptId = u.DeptId,
                    TeacherId = u.TeacherId,
                    CreateTime = u.CreateTime,
                    Teacher = new TbTeacher
                    {
                        TeacherName = u.Teacher.TeacherName,
                        TeacherNo = u.Teacher.TeacherNo,
                    },
                    Classes = u.Classes.Select(u=>new TbClass
                    {
                        Id = u.Id,
                        ClassesName = u.ClassesName,
                        Dept = new TbDept
                        {
                            Id = u.Dept.Id,