Entity Framework Core Automapper 特定用户最近查看的项目

Question

使用 Entity Framework Core，我想获得用户最近查看的 10 个职位的列表。

我正在开发包含 User、Job 和 UserJobView 类.

的 CRM

public class User
{
    public Guid Id { get; set; }
    public string Name { get; set; }
}

public class Job
{
    public Guid Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
}

public class UserJobView
{
    public Guid Id { get; set; }
    public Guid JobId { get; set; }
    public Guid UserId { get; set; }
    public DateTime LastViewedAt { get; set; }

    public Job Job { get; set; }
}

我还有一个 JobDto，我打算使用 AutoMapper

public class JobDto : IMapFrom<Job>
{
    public Guid Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
    public DateTime? LastViewedAt { get; set; }
}

每次 User 查看 Job 我更新或创建一个 UserJobView 对象设置 LastViewedAt 属性为 DateTime.Now

我可以通过以下流畅的查询获取最新查看的项目

return await _context.UserJobViews 
    .Where(x => x.UserId == thisUserId)
    .OrderByDescending(x => x.LastViewed)
    .Take(10)
    .Select(x => x.Job)
    .ProjectTo<JobDto>(_mapper.ConfigurationProvider)
    .ToListAsync();

然而，这显然不会为 JobDto 填充 LastViewedAt 属性。我该怎么做呢？

Answer 1

只需在配置中添加少量内容，即可实现：

CreateMap<UserJobView, JobDto>().IncludeMembers(s => s.Job);

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