Laravel 7 : attach pivot to table with multiple values - laravel

Question

I'm creating a pivot tables for 3 columns
my pivot table name is : category_post_pad
category_id| post_id | pad_id
-----------|----------|--------
1 | 1 | 3
1 | 4 | 1
2 | 2 | 1
Each post sent by the user includes a category and an pad
Post Model
public function categories()
{
return $this->belongsToMany(Category::class,'category_post_pad','post_id','category_id');
}
public function pads()
{
return $this->belongsToMany(Pad::class,'category_post_pad','post_id','pad_id');
}
category model:
public function posts()
{
return $this->belongsToMany(Post::class,'category_post_pad','category_id','post_id');
}
pad model:
public function posts()
{
return $this->belongsToMany(Post::class,'category_post_pad','pad_id','post_id');
}
PostsController
public function store(Request $request)
{
$data = $request->all();
$post = Post::create($data);
if ($post && $post instanceof Post) {
$category = $request->input('categories');
$pad = $request->input('pads');
$post->categories()->attach([$category],[$pad]);
return redirect()->back();
}
}
but show me this error
SQLSTATE[42S22]: Column not found: 1054 Unknown column '0' in 'field list' (SQL: insert into category_post_pad (category_id, post_id, 0) values (3, 104, 2))
how to fixit?

Answer 1

Try using the following code as the store function in your PostsController:
$request->validate([
'title' => 'required',
'body' => 'required',
'category_post_pad.*.category_id' => 'required|array|integer',
'category_post_pad.*.post_id' => 'required|array|integer',
'category_post_pad.*.pad_id' => 'required|array|integer',
]);
$date = [
'title' => $request->input('title'),
'body' => $request->input('body'),
];
$post = Post::create($date);
if ($post){
if (count($request->input('category_id')) > 0){
$date2 = array();
foreach ( $request->input('category_id') as $key => $value ){
$postCategory = array(
'post_id' => $post->id,
'category_id' => (int)$request->category_id[$key],
'pad_id' => (int)$request->pad_id[$key],
);
array_push($date2, $postCategory);
}
$post->categories()->attach($date2);
return redirect()->back();
}
}
Then, inside of your Post model change your catagory relation:
public function categories()
{
return $this->belongsToMany(Category::class,'category_post_pad','post_id','category_id')->withPivot('pad_id');
}