How to especify a current key-node in xamarin with firebase? - database

Question

I’m working with Xamarin and FireBase, I have the next problem:
I have Users in my database and each one has a list of items. I need to retrieve the list of items of the current user, and the problem is that I don’t know how to replace the key of each user in the tree, (I just hard-wrote it). This is the snippet :
var products = (await client.Child("Users").Child("-MXf6T19md1UOTVvHWRU").Child("Items")
.OnceAsync<Item>())
.Select(f => new Item
{ . . .
Here is a picture of the database tree.
How do I replace the Child("-MXf6T19md1UOTVvHWRU") by the current branch where I’m at?, taking into account that I have to access another Child next to that. Of course I have access to the Username value that is stored in preferences.
I would appreciate some enlightenment, thanks in advance.

Answer 1

I need to retrieve the list of items of the current user, and the problem is that I don’t know how to replace the key of each user in the tree, (I just hard-wrote it).
You could use the code below to get all the items first and then get the specific item.
public async Task<List<User>> GetAllUsers()
{
return (await firebase
.Child("Users")
.OnceAsync<User>()).Select(item => new User
{
Name = item.Object.Name,
UserId = item.Object.UserId,
}).ToList();
}
public async Task<User> GetUser(int userId)
{
var allUsers = await GetAllUsers();
await firebase
.Child("Users")
.OnceAsync<User>();
return allUsers.Where(a => a.UserId == userId).FirstOrDefault();
}
Model:
public class User
{
public int UserId { get; set; }
public string Name { get; set; }
}
You could download the similar source code from the GitHub.
https://github.com/susairajs/Xamarin-Firebase-RealtimeDatabase