backend/ExamKing.Application/Services/ExamService.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;
using Furion.DatabaseAccessor;
using Furion.DependencyInjection;
using Furion.FriendlyException;
using Mapster;
using Microsoft.EntityFrameworkCore;
using Furion.DatabaseAccessor.Extensions;

namespace ExamKing.Application.Services
{
    /// <summary>
    /// 试卷服务
    /// </summary>
    public class ExamService : IExamService, ITransient
    {
        private readonly IRepository<TbExam> _examRepository;
        
        /// <summary>
        /// 依赖注入
        /// </summary>
        public ExamService(
            IRepository<TbExam> examRepository)
        {
            _examRepository = examRepository;
        }

        /// <summary>
        /// 手动组卷
        /// </summary>
        /// <param name="examDto"></param>
        /// <returns></returns>
        public async Task<ExamDto> CreateExam(ExamDto examDto)
        {
            // 查询课程所属班级
            var course = await _examRepository.Change<TbCourse>()
                .Entities.AsNoTracking()
                .Where(u => u.Id == examDto.CourseId)
                .Select(u => new TbCourse
                {
                    Id = u.Id,
                    Classes = u.Classes.Select(x=> new TbClass
                    {
                        Id = x.Id
                    }).ToList(),
                }).FirstOrDefaultAsync();
            if (course == null)
            {
                throw Oops.Oh(CourseErrorCodes.c1501);
            }
            var examInsert = examDto.Adapt<TbExam>();
            var examclasses = new List<TbExamclass>();
            // 考试绑定班级
            foreach (var classes in course.Classes)