Display individuals based on their location using "location_user" in Laravel 8

Question

Display individuals based on their location using "location_user" in Laravel 8

I am encountering an issue when it comes to displaying users based on locations.

The problem lies in the fact that it only shows the user and not the users associated with the locations.

What I desire is for the user to see only the users located in the places linked in the 'location_user' table.

I acknowledge that the issue stems from 'location_user', 'location_user.user_id', '=', 'users.id'

However, I prefer a solution that is more intelligent and does not involve adding a column named location_id to the user list

This is because I require support for multiple locations

This pertains to the data in UsersController.php

$data = User::leftjoin('location_user', 'location_user.user_id', '=', 'users.id')
->where('location_user.user_id', auth()->user()->id)
->leftjoin('locations', 'locations.id', '=', 'location_user.location_id')
->where('locations.status', '1')
->select('users.*',)
->orderBy('status', 'DESC')->get();

Tables

users: https://i.sstatic.net/h3dID.jpg

location_user: https://i.sstatic.net/6KGZN.jpg

locations: https://i.sstatic.net/UDbDJ.jpg

Can someone assist me with this challenge?

Thank you.

javascript json laravel datatables laravel-8

Answer 1

Answer №1

According to the structure of your table, there exists a many-to-many relationship between User and Location through the intermediary table named location_user.

If the relationships are defined on both models as follows:

//User Model
public function locations()
{
    return $this->belongsToMany(Location::class);
}

//Location Model
public function users()
{
    return $this->belongsToMany(User::class);
}

You can then create a query to retrieve all users associated with the locations of the currently logged-in user.

$locationIds = auth()->user()->locations->pluck('id');

$users = User::query()
    ->whereHas('locations', fn($query) => $query->whereIn('id', $locationIds)
    /** If you want results to include the currently logged in user
      * remove the below where condition **/
    ->where('id', '<>', auth()->id())
    ->get();

Alternatively, you can use conventional anonymous closure functions instead of arrow function syntax like this:

$locationIds = auth()->user()->locations->pluck('id');

$users = User::query()
    ->whereHas('locations', function($query) use($locationIds){
        $query->whereIn('id', $locationIds);
    })
    /** If you want results to include the currently logged in user
      * remove the below where condition **/
    ->where('id', '<>', auth()->id())
    ->get();

Answer 2

According to the structure of your table, there exists a many-to-many relationship between User and Location through the intermediary table named location_user.

If the relationships are defined on both models as follows:

//User Model
public function locations()
{
    return $this->belongsToMany(Location::class);
}

//Location Model
public function users()
{
    return $this->belongsToMany(User::class);
}

You can then create a query to retrieve all users associated with the locations of the currently logged-in user.

$locationIds = auth()->user()->locations->pluck('id');

$users = User::query()
    ->whereHas('locations', fn($query) => $query->whereIn('id', $locationIds)
    /** If you want results to include the currently logged in user
      * remove the below where condition **/
    ->where('id', '<>', auth()->id())
    ->get();

Alternatively, you can use conventional anonymous closure functions instead of arrow function syntax like this:

$locationIds = auth()->user()->locations->pluck('id');

$users = User::query()
    ->whereHas('locations', function($query) use($locationIds){
        $query->whereIn('id', $locationIds);
    })
    /** If you want results to include the currently logged in user
      * remove the below where condition **/
    ->where('id', '<>', auth()->id())
    ->get();

Answer 3

Answer №2

Initially, there is no need to link the "location_user" table because each user is connected to only one location. This implies a ManyToOne relationship, which can be established by adding the following code to your models:

class User extends Model
{
    // Add this line
    public function location()
    {
        return $this->belongsTo(Location::class);
    }
}

class Location extends Model
{
    // Add this line
    public function users()
    {
        return $this->hasMany(User::class);
    }
}

Once that is done, you can retrieve all members within a user's location using their id like so:

$user = User::find(1); // Find user with id 1
$location = $user->location; // Get location associated with user id 1 

$members  = $location->users; // Retrieve all members linked to the location of user id 1

In case of a ManyToMany relationship, you can still apply the same approach by making the following modifications:

  /*
public function location()
        {
            return $this->belongsTo(Location::class);
        }
*/

Change it to:

  public function locations()
        {
            return $this->belongsToMany(Location::class,'location_user');
        }

and:

  /*
public function users()
        {
            return $this->hasMany(User::class);
        }
*/

Change it to:

  public function users()
        {
            return $this->belongsToMany(User::class,'location_user');
        }

You can then combine the members using collection methods: Collections Or utilize whereHas and orHas for more complex queries.

Answer 4

Initially, there is no need to link the "location_user" table because each user is connected to only one location. This implies a ManyToOne relationship, which can be established by adding the following code to your models:

class User extends Model
{
    // Add this line
    public function location()
    {
        return $this->belongsTo(Location::class);
    }
}

class Location extends Model
{
    // Add this line
    public function users()
    {
        return $this->hasMany(User::class);
    }
}

Once that is done, you can retrieve all members within a user's location using their id like so:

$user = User::find(1); // Find user with id 1
$location = $user->location; // Get location associated with user id 1 

$members  = $location->users; // Retrieve all members linked to the location of user id 1

In case of a ManyToMany relationship, you can still apply the same approach by making the following modifications:

  /*
public function location()
        {
            return $this->belongsTo(Location::class);
        }
*/

Change it to:

  public function locations()
        {
            return $this->belongsToMany(Location::class,'location_user');
        }

and:

  /*
public function users()
        {
            return $this->hasMany(User::class);
        }
*/

Change it to:

  public function users()
        {
            return $this->belongsToMany(User::class,'location_user');
        }

You can then combine the members using collection methods: Collections Or utilize whereHas and orHas for more complex queries.

Display individuals based on their location using "location_user" in Laravel 8

Answer №1

Answer №2

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