迅速显示来自所有Firebase用户的信息 [英] swift showing posts from all firebase users

问题描述

我需要使用firebase作为后端来创建一个UISearchController。我目前在Firebase中有两个用户。一个用户发了一个帖子，另一个发了四个帖子。我希望能够搜索我的数据库中的所有图书（五个）的标题。不过，截至目前，我只能搜索当前用户上传的图书。以下是我的数据库外观和屏幕截图。

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$ b $ pre $ databaseRef.child（posts）。child（userID！）。observe（.childAdded，with：{（snapshot ）in


let key = snapshot.key
let snapshot = snapshot.value as？NSDictionary
snapshot？.setValue（key，forKey：uid）

if（key == self.loggedUser？.uid）
{
print（与登录用户相同）
}
else
$ b self.usersArray.append（snapshot）
self.followUsersTableView.insertRows（at：[IndexPath（row：self.usersArray.count-1，section：0）]，与：UITableViewRowAnimation .automatic）
}



））{（error）in
print（error.localizedDescription）
}
$


$ div

解决方案

您将需要一个不同的父节点所谓的书： - $ /

现在你的JSON是这样的： - $ / $>

 帖子：{
 userID1：{
 BOOK_11_ID：{.....} 
}; 
 
 userID2：{
 BOOK_21_ID：{.....}，
 BOOK_22_ID：{.....}，
 BOOK_23_ID：{.... 。，
 BOOK_24_ID：{.....}，
} 
} 
  

您必须修改您的数据库JSON结构：

 文章：{
 
 Users_books：{
 userID1：{
 BOOK_11：true // Value'true'表示这个用户
 //已经订阅或购买了这本书或者任何
}; 
 
 userID2：{
 BOOK_21：true，
 BOOK_22：true，
 BOOK_23：true，
 BOOK_24：true，
} 
 $，
 
书籍：{
 BOOK_11_ID：{/ Book details /}; 
 BOOK_21_ID：{/ Book details /}; 
 BOOK_22_ID：{/ Book details /}; 
 BOOK_23_ID：{/ Book details /}; 
 BOOK_24_ID：{/ Book details /}; 
 
 
 $ b  

修改您的安全规则，所有经过验证的用户都可以看到书。

  {
rules：{
 
Users_books：{
 
.write：auth！= null&& auth.uid === $ uid，//只允许用户制作
.read：auth！= null&& auth.uid === $ uid
 
}，
Books：{
.write：auth！= null，//将允许所有通过应用程序认证的用户访问每一本书的详细信息。 
.read：auth！= null
} 
} 
} 
  

现在你要做的是： -
$ b $ 1）如果它的用户正在创建这本书;然后将图书详细信息存储在书籍 uid 下的父节点Books中，并将book_ID的值设置为true。

2）如果数据库是所有后端，即你输入它;无论何时用户订阅或购买书籍，只需获取该书的uid，并在该用户的部分中将其设置为true即可。

PS ：总是扇出你的数据库;它更容易搜索它。虽然我很确定你想在不久的将来存储用户的一些个人细节，所以只是做另一个节点。将它命名为'用户'，安全规则将与'Users_books'以及'用户'父节点下的每个用户的详细信息他们的 uid 作为他们的关键。

I need to create a UISearchController using firebase as the backend. I currently have two users in firebase. One user has made one post and the other has made four posts. I will like to be able to search for the title of all of the books in my database (which is five). However, as of now, I can only search for the books the current signed in user uploaded. Below is a screenshot of what my database looks like and what my code currently looks like.

databaseRef.child("posts").child(userID!).observe(.childAdded, with: { (snapshot) in


    let key = snapshot.key
    let snapshot = snapshot.value as? NSDictionary
    snapshot?.setValue(key, forKey: "uid")

    if(key == self.loggedUser?.uid)
    {
        print("same as logged in user")
    }
    else
    {
    self.usersArray.append(snapshot)
         self.followUsersTableView.insertRows(at: [IndexPath(row:self.usersArray.count-1,section:0)], with: UITableViewRowAnimation.automatic)
    }



    }) { (error) in
        print(error.localizedDescription)
    }

}

解决方案

You will need a different parent node called Books :-

Right now your JSON is something like this :-

posts : {
    userID1 : {
       BOOK_11_ID : {.....}
       };

    userID2 : {
       BOOK_21_ID : {.....},
       BOOK_22_ID : {.....},
       BOOK_23_ID : {.....},
       BOOK_24_ID : {.....},
       }
 }

You gotta modify your database JSON structure to :-

 posts : {

   Users_books :{
    userID1 : {
       BOOK_11 : true  // Value 'true' means that this user 
                      // has subscribed or bought this book or whatever
       };

    userID2 : {
       BOOK_21 : true,
       BOOK_22 : true,
       BOOK_23 : true,
       BOOK_24 : true,
       }
      },

   Books:{
       BOOK_11_ID : {/Book details/};
       BOOK_21_ID : {/Book details/};
       BOOK_22_ID : {/Book details/};
       BOOK_23_ID : {/Book details/};
       BOOK_24_ID : {/Book details/};
       }

 }

Modify your security rules for section 'Book' to make is visible to all the authenticated users.

{
 "rules" :{

  "Users_books" : {

     ".write" : "auth != null && auth.uid === $uid",  // Will allow only the user to make any change within its node and no-one else
     ".read": "auth != null && auth.uid === $uid"

       },
  "Books" : {
      ".write" : "auth != null",  // Will allow all the users that are authenticated to your app to access every books detail.
      ".read" : "auth != null"
       }
     } 
  }

Now what you gotta do is :-

1) If its the user that is creating the book ; Then store the book details in the parent node 'Books' under the books uid and set the value of book_ID to true in the users node.

2) If the database is all backend i.e you input it; Whenever the user subscribe's or buys a books just fetch the uid of that book and set it to true in the section of that user.

PS : Always fan out your database ; its much easier to search from it .Although i am pretty sure you are gonna wanna store some personal details of the user in the near future so for that just make another node . Name it 'Users', security rules will be same as 'Users_books' and under 'Users' parent node append details of every which user with their uid as their key.

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