我实质上是在创建博客(命名约定略有不同)。我在“发布”类(我称之为故事)上有一个属性,该属性与称为“可见性”的表相关联。帖子可以是公开的也可以是私有的。
当用户查看其他成员的个人资料时,他们应该能够看到所有公开帖子。
我已经创建了一个视图模型:
public class UserDetailsViewModel
{
public bool IsRegisteredUser { get; set; }
//public bool IsStoryPrivate { get; set; }
public int StoryCount { get; set; }
public int ReviewCount { get; set; }
public ApplicationUser User { get; set; }
public virtual IEnumerable<Story> Stories { get; set; }
}
在我的用户控制器中,当某人单击个人资料以查看个人资料的详细信息时,我从数据库中获取了该用户,获取了与该用户关联的所有故事(文章),并包含了与该文章相关的各种表格,获取帖子数,然后将这些值插入我的视图模型。这是通过以下代码完成的:
public ActionResult Details(string id)
{
//verify an id was passed
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
//if an id was given as a parameter, find the user associated with that id
var foundUser = dbContext.Users.SingleOrDefault(x => x.Id == id);
//verify a user was found
if (foundUser == null)
{
return HttpNotFound();
}
var isRegisteredUser = IsRegisteredUser(foundUser);
//if a user was found, get all stories associated with the foundUser
var stories = dbContext.Stories
.Include("Genre")
.Include("StoryType")
.Include("StoryAgeRange")
.Include("Visibility")
.Where(x => x.AuthorId == foundUser.Id);
var reviews = dbContext.Reviews.Where(x => x.ReviewerId == foundUser.Id);
int numOfStories = stories.Count();
int numOfReviews = reviews.Count();
//create the viewmodel
var viewModel = new UserDetailsViewModel
{
User = foundUser,
//IsStoryPrivate = isStoryPrivate,
IsRegisteredUser = isRegisteredUser,
Stories = stories,
StoryCount = numOfStories,
ReviewCount = numOfReviews
};
return View(viewModel);
}
我想做的是创建一个称为IsStoryPrivate的方法,该方法返回一个布尔值,并且需要遍历故事中的每个故事。然后将true / false值传递给IsStoryPrivate字段中的viewModel。
我尝试使用以下代码:
public bool IsStoryPrivate(Story story)
{
return story.Visibility.Name == "Private";
}
然后尝试在控制器中调用它,但是失败了,因为我没有将单个故事对象传递给方法,而是传递了一个集合或故事列表。
然后我尝试了这个:
public bool IsStoryPrivate(ICollection<Story> story)
{
foreach (story in story)
{
return Story.Visibility.Name == "Private";
}
}
这也会导致错误。我不确定如何编写代码来遍历从数据库返回的故事列表,并为每个可以发送到视图模型的故事提供真假信息。
答案 0 :(得分:5)
不是从数据库中获取所有故事,然后决定是否显示它们,而是对初始查询进行过滤:
var stories = dbContext.Stories
.Include("Genre")
.Include("StoryType")
.Include("StoryAgeRange")
.Include("Visibility")
.Where(x => x.AuthorId == foundUser.Id);
// filter for public stories only when the author is not the current user
if (!isRegisteredUser)
{
stories = stories.Where(x => x.Visibility.Name == "Public");
}
如果您正在加载Visibilty
关系以进行支票,则可以现在将其省略:
var stories = dbContext.Stories
.Include("Genre")
.Include("StoryType")
.Include("StoryAgeRange")
.Where(x => x.AuthorId == foundUser.Id);
答案 1 :(得分:0)
我不是100%地确定您理解正确。 如果您需要设置单个布尔值(例如“如果有任何故事是私有的,则将其设置为true”)
var viewModel = new UserDetailsViewModel
{
User = foundUser,
IsStoryPrivate = stories.Any(x => IsStoryPrivate(x)), // or simply .Any(IsStoryPrivate)
IsRegisteredUser = isRegisteredUser,
Stories = stories,
StoryCount = numOfStories,
ReviewCount = numOfReviews
};
或者如果所有故事都是私人的,则需要设置它,则可以使用All
代替Any