重构试卷相关内容
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SpecialX
261
TechHelper.Server/Services/QuestionService.cs
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261
TechHelper.Server/Services/QuestionService.cs
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using AutoMapper;
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using Entities.Contracts;
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using SharedDATA.Api;
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using TechHelper.Services;
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using System.Linq.Expressions;
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using System.Linq;
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using Entities; // 引入你的 Question 实体所在的命名空间
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using Microsoft.EntityFrameworkCore;
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using Entities.DTO; // 引入 EF Core 用于 Include (如果需要)
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namespace TechHelper.Server.Services
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{
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public class QuestionService : IQuestionService
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{
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private readonly IUnitOfWork _work;
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// 如果不再需要 AutoMapper 进行实体到 DTO 的映射，可以移除 _mapper 字段
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// 但如果 AutoMapper 在其他服务中用于其他映射，或者将来可能需要，可以保留
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private readonly IMapper _mapper;
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private readonly IExamService _examService;
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public QuestionService(IUnitOfWork work, IMapper mapper, IExamService examService)
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{
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_work = work;
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_mapper = mapper;
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_examService = examService;
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}
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public async Task<ApiResponse> AddAsync(Question model)
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{
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try
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{
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// 可以在此处进行业务逻辑校验，例如检查题目是否已存在
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var existingQuestion = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(
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predicate: q => q.QuestionText == model.QuestionText && !q.IsDeleted
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);
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if (existingQuestion != null)
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{
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return ApiResponse.Error($"题目 '{model.QuestionText}' 已存在，请勿重复添加。");
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}
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// 设置创建时间、创建者等通用属性
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model.Id = Guid.NewGuid();
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model.CreatedAt = DateTime.UtcNow;
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model.UpdatedAt = DateTime.UtcNow;
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model.IsDeleted = false;
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model.ValidQuestion = true; // 假设新添加的题目默认为有效
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// model.CreatedBy = ... // 实际应用中，这里应该从当前用户上下文获取
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await _work.GetRepository<Question>().InsertAsync(model);
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await _work.SaveChangesAsync();
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// 直接返回 Question 实体
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return ApiResponse.Success("题目添加成功。", model);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"添加题目失败: {ex.Message}");
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}
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}
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public async Task<ApiResponse> DeleteAsync(Guid id)
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{
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try
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{
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var questionToDelete = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(predicate: q => q.Id == id && !q.IsDeleted);
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if (questionToDelete == null)
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{
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return ApiResponse.Error($"找不到 ID 为 {id} 的题目，或者该题目已被删除。");
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}
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// 软删除
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questionToDelete.IsDeleted = true;
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questionToDelete.UpdatedAt = DateTime.UtcNow;
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_work.GetRepository<Question>().Update(questionToDelete);
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await _work.SaveChangesAsync();
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return ApiResponse.Success($"ID 为 {id} 的题目已成功删除 (软删除)。");
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"删除题目时发生错误: {ex.Message}");
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}
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}
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public async Task<ApiResponse> FindByTitle(string title)
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{
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try
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{
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var question = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(
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predicate: q => q.QuestionText == title && !q.IsDeleted
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);
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if (question == null)
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{
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return ApiResponse.Error($"未找到题目 '{title}'。");
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}
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// 直接返回 Question 实体
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return ApiResponse.Success(result: question);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"查找题目时出现问题: {ex.Message}");
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}
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}
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public async Task<ApiResponse> CheckTitlesExistence(IEnumerable<string> titles)
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{
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try
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{
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if (titles == null || !titles.Any())
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{
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return ApiResponse.Success("未指定查询的题目文本，返回空结果。", new Dictionary<string, bool>());
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}
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var distinctTitles = titles.Distinct(StringComparer.OrdinalIgnoreCase).ToList();
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var existingQuestions = await _work.GetRepository<Question>().GetAllAsync(
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predicate: q => distinctTitles.Contains(q.QuestionText) && !q.IsDeleted
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);
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var existingQuestionTexts = new HashSet<string>(existingQuestions.Select(q => q.QuestionText), StringComparer.OrdinalIgnoreCase);
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var resultDictionary = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);
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foreach (var title in titles)
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{
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resultDictionary[title] = existingQuestionTexts.Contains(title);
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}
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return ApiResponse.Success(result: resultDictionary);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"批量查找题目存在性时出现问题: {ex.Message}");
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}
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}
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public async Task<ApiResponse> GetAllAsync(QueryParameter query)
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{
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try
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{
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Expression<Func<Question, bool>> predicate = q => !q.IsDeleted;
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if (!string.IsNullOrWhiteSpace(query.Search))
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{
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predicate = predicate.And(q => q.QuestionText.Contains(query.Search));
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}
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Func<IQueryable<Question>, IOrderedQueryable<Question>> orderBy = null;
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if (true)
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{
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orderBy = q => q.OrderByDescending(x => x.CreatedAt);
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}
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else
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{
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orderBy = q => q.OrderByDescending(x => x.CreatedAt);
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}
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var questions = await _work.GetRepository<Question>().GetPagedListAsync(
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predicate: predicate,
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orderBy: orderBy,
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pageIndex: query.PageIndex,
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pageSize: query.PageSize
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);
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if (!questions.Items.Any())
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{
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return ApiResponse.Error("未找到任何题目。", Enumerable.Empty<Question>()); // 返回空 Question 集合
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}
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// 直接返回 Question 实体集合
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return ApiResponse.Success(result: questions);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"获取题目列表时出现问题: {ex.Message}");
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}
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}
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public async Task<ApiResponse> GetAsync(Guid id)
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{
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try
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{
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var question = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(predicate: q => q.Id == id && !q.IsDeleted);
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if (question == null)
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{
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return ApiResponse.Error($"找不到 ID 为 {id} 的题目。");
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}
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// 直接返回 Question 实体
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return ApiResponse.Success(result: question);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"获取题目时发生错误: {ex.Message}");
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}
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}
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public async Task<ApiResponse> UpdateAsync(Question model)
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{
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try
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{
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var existingQuestion = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(predicate: q => q.Id == model.Id && !q.IsDeleted);
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if (existingQuestion == null)
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{
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return ApiResponse.Error($"找不到 ID 为 {model.Id} 的题目，无法更新。");
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}
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// 检查更新后的题目文本是否与现有其他题目重复
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var duplicateCheck = await _work.GetRepository<Question>().GetFirstOrDefaultAsync(
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predicate: q => q.Id != model.Id && q.QuestionText == model.QuestionText && !q.IsDeleted
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);
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if (duplicateCheck != null)
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{
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return ApiResponse.Error($"题目文本 '{model.QuestionText}' 已被其他题目占用，请修改。");
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}
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// 手动复制属性或使用 AutoMapper (如果保留了 _mapper 字段)
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// 如果选择手动复制，请确保复制所有需要更新的属性
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existingQuestion = model;
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_work.GetRepository<Question>().Update(existingQuestion);
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await _work.SaveChangesAsync();
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// 直接返回更新后的 Question 实体
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return ApiResponse.Success("题目更新成功。", existingQuestion);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"更新题目失败: {ex.Message}");
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}
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}
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}
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// PredicateBuilder 保持不变，如果你没有使用 LinqKit，这部分是必需的
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public static class PredicateBuilder
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{
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public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second)
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{
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var invokedExpr = Expression.Invoke(second, first.Parameters.Cast<Expression>());
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return Expression.Lambda<Func<T, bool>>(Expression.AndAlso(first.Body, invokedExpr), first.Parameters);
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}
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public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second)
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{
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var invokedExpr = Expression.Invoke(second, first.Parameters.Cast<Expression>());
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return Expression.Lambda<Func<T, bool>>(Expression.OrElse(first.Body, invokedExpr), first.Parameters);
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}
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public static Expression<Func<T, bool>> True<T>() { return f => true; }
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public static Expression<Func<T, bool>> False<T>() { return f => false; }
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}
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}
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