how join laravel tables to get non intersected data - php

Question

in my Laravel app I have 3 tables : users, documents and type_documents, the user have multiple documents and document have one type_document
| Documents |
| -------- |
| id |
| file |
| type_document_id|
| user_id |
| type_documents |
| -------- |
| id |
| name |
| users |
| -------- |
| id |
| name |
| type_document_d|
I want select the types that are not used in documents table for the current user with eloquent
I try with this, but it give me the used type_documents :
$document_types = TypeDocument::leftJoin('docments' , function ($join) {
$join->on('type_documents.id', '=', 'douments.type_document_id')
->where('documents.user_id', auth()->id());
})
->applyFilters($request->all())
->latest()
->paginateData($limit);
I use Laravel version 8

Answer 1

Using Eloquent relation defined between TypeDocument::class and User::class like this:
TypeDocument.php
public function users()
{
return $this->belongsToMany(User::class, 'documents', 'type_document_id', 'user_id')->withPivot('file');
}
The you can easily get the type document not linked to a specific user like this
TypeDocument::whereDoesntHave('users', function($userQuery) {
$userQuery->where('users.id', '=', auth()->id());
})
->applyFilters($request->all())
->latest()
->paginateData($limit);
--------------EDIT--------------
IF you want to use two step relation, you can define it like this:
TypeDocument.php
public function documents()
{
return $this->hasMany(Document::class);
}
Document.php
public function user()
{
return $this->belongsTo(User::class);
}
And use the relations to query it like this:
TypeDocument::whereDoesntHave('documents.user', function($userQuery) {
$userQuery->where('users.id', '=', auth()->id());
})
->applyFilters($request->all())
->latest()
->paginateData($limit);

Answer 2

Have you tried whereNotExists() or whereNotIn() instead of leftJoin()?
eg:
<?php
// whereNotIn
$types = TypeDocument::whereNotIn('id', function($query) {
$query->select('type_document_id')
->from('documents')
->where('user_id', auth()->id);
})->get();
<?php
// whereNotExists
$types = TypeDocument::whereNotExists(function($query) {
$query->select(DB::raw(1))
->from('documents')
->whereRaw('type_documents.id = documents.type_document_id')
->where('user_id', '=', Auth::user()->id);
})->get();
<?php
// leftJoin
$types = TypeDocument::leftJoin('documents', function($join) {
$join->on('type_documents.id', '=', 'documents.type_document_id')
->where('user_id', '=', Auth::user()->id);
})->whereNull('documents.type_document_id')->get();
try any of these!

Answer 3

Check this solution
TypeDocument::whereNotIn('id', function($query){
$query->select('type_document_id')
->from(with(new Documents)->getTable())
->where('type_document_id', $query->id)
->where('user_id', auth()->id());
})->get();