backend/ExamKing.Application/Services/ChapterService.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;
using Furion.DependencyInjection;
using Furion.FriendlyException;
using Mapster;
using Microsoft.EntityFrameworkCore;

namespace ExamKing.Application.Services
{
    public class ChapterService : IChapterService, ITransient
    {
        private readonly IRepository<TbChapter> _chapterRepository;

        /// <summary>
        /// 依赖注入
        /// </summary>
        /// <param name="chapterRepository"></param>
        public ChapterService(IRepository<TbChapter> chapterRepository)
        {
            _chapterRepository = chapterRepository;
        }

        /// <summary>
        /// 创建章节
        /// </summary>
        /// <param name="chapterDto"></param>
        /// <returns></returns>
        public async Task<ChapterDto> CreateChapter(ChapterDto chapterDto)
        {
            // 判断课程是否存在
            var course = await _chapterRepository.Change<TbCourse>()
                .FirstOrDefaultAsync(u => u.Id == chapterDto.CourseId);
            if (course==null)
            {
                throw Oops.Oh(CourseErrorCodes.c1501);
            }
            var chapter = await _chapterRepository
                .InsertNowAsync(chapterDto.Adapt<TbChapter>());
            return chapter.Entity.Adapt<ChapterDto>();
        }

        /// <summary>
        /// 更新章节
        /// </summary>
        /// <param name="chapterDto"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public async Task<ChapterDto> UpdateChapter(ChapterDto chapterDto)
        {
            // 判断课程是否存在
            var course = await _chapterRepository.Change<TbCourse>()
                .FirstOrDefaultAsync(u => u.Id == chapterDto.CourseId);
            if (course==null)
            {