Thread not returning all subscribed users - mysql

Question

About
I am using Laravel 5.8 with MySQL. I have a thread table and thread details table. I am fetching all records from threads and it's associated from threaddetails table wherever there are matching user_id found in threaddetails.
Expected
It should return all my thread and subscribed users present in the thread.
Current
It returns all my threads but from threaddetails table it returns my records only. It does not returns other subscribed users with which I am chatting.
Question:
Am I missing anything in Query to fetch the data section?
Table: Thread - Schema
Schema::create('tblthread', function (Blueprint $table) {
$table->unsignedMediumInteger('thread_id')->autoIncrement();
$table->timestamp('created_on');
});
Table Thread Sample Data
INSERT INTO tblthread (thread_id, created_on) VALUES
(1, '2019-08-07 20:30:54');
Table Thread Details
Schema::create('tblthreaddetails', function (Blueprint $table) {
$table->unsignedMediumInteger('thread_detail_id')->autoIncrement();
$table->unsignedMediumInteger('thread_id');
$table->unsignedMediumInteger('user_id')->nullable();
$table->foreign('thread_id')->references('thread_id')->on('tblthread')->onDelete('cascade');
});
Sample Data - Thread Details
INSERT INTO `tblthreaddetails` (`thread_detail_id`, `thread_id`, `user_id`) VALUES
(1, 1, 1),
(2, 1, 6);
Query to fetch the data
ThreadModel::with(["Details" => function($query) use ($user_id) {
$query->where("user_id", $user_id);
}])->get();
Thread Model
class ThreadModel extends Model
{
public $table = 'tblthread';
public $primaryKey = 'thread_id';
public $timestamps = false;
public function Details() {
return $this->hasMany("\ThreadDetailsModel", "thread_id", "thread_id");
}
}
Thread Details Model
class ThreadDetailsModel extends Model
{
public $table = 'tblthreaddetails';
public $primaryKey = 'thread_detail_id';
public $timestamps = false;
}

Answer 1

tblthread should be associated to a user. Hence you can define user_id column on it.
The query should look like this:
ThreadModel::where('user_id', $user_id)->with("Details")->get();
// So first you get all the threads that belong to you
// and then get all details for those threads (only)
Hope it helps!

Answer 2

The problem is here:
ThreadModel::with(["Details" => function($query) use ($user_id) {
$query->where("user_id", $user_id);
}])->get();
This query will filter all the related details that only contain the user_id = $user_id. So, of course, only the details related to the $user_id will be returned. So, basically you are constraining the related models.. not the threads itself. So with this, there might be some Thread returned that doens't have any detail associated with the user $user_id which I assume you don't want...
Try this instead:
Check if a Thread has at least one associated Detail that belongs to the user_id = $user_id.
Load all the Details of those Threads.
So this should work:
use Illuminate\Database\Eloquent\Builder;
// ...
public function myCoolMethod()
{
$threads = ThreadModel
::has('details', function (Builder $query) use ($user_id) {
$query->where('user_id', $user_id);
})
->with('details')
->get();
// ...
}
- With the has() method we are checking relationship existence.
- With the with() method we are eager loading all the related details of those selected threads.

Answer 3

whereHas solved my issue
ThreadModel
::whereHas('details', function (Builder $query) use ($user_id) {
$query->where('user_id', $user_id);
})
->with('details')
->get();