How can I insert into laravel pivot table? - mysql

Question

I have 3 tables:
stations (id,station_name)
products (id,product_name)
product_station (station_id,product_id)
Station Model
protected $fillable = ['station_name'];
public function products(){
return $this->belongsToMany(Product::class);
}
Product Model
protected $fillable = ['product_name'];
public function stations(){
return $this->belongsToMany(Station::class);
}
I already have inserted stations and products and i want to insert
station with it's own product using into Pivot table
AdminProductStationcontroller
public function create()
{
$station = Station::pluck('station_name','id')->all();
$products = Product::pluck('product_name','id')->all();
return view('admin.product_stations.create',compact('station','products'));
}
I think there is error in store function below
public function store(Request $request)
{
$station = new Station();
$product = new Product();
$station->save();
$station->products()->attach($product);
return redirect('/admin/product_stations');
}
So i have got this error
(2/2) QueryException
SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'product_id' cannot be null (SQL: insert into product_station (product_id, station_id) values (, 25))

Answer 1

attach() expects a single or an array of ids of the related Model implying that the Model should have been created beforehand.
What you're looking for is the save(Model) method.
$station->products()->save($product);
More on the above in the docs: https://laravel.com/docs/5.8/eloquent-relationships#updating-many-to-many-relationships

Answer 2

You should firstly save
$station = new Station();
$station->save();
$product = new Product();
$product->save();
then
https://laravel.com/docs/6.x/eloquent-relationships#updating-many-to-many-relationships
$station->products()->attach($product->id);
OR
You can try to save like so
$station->products()->save($product);

Answer 3

// Post Model
public function categories()
{
return $this->belongsToMany('App\Category')->withTimestamps();
}
public function tags()
{
return $this->belongsToMany('App\Tag')->withTimestamps();
}
public function store(Request $request)
{
$this->validate($request,[
'title' =>'required',
'image' => 'mimes:jpeg,jpg,bmp,png',
'categories' => 'required',
'tags' => 'required',
'body' => 'required',
'live_demo' =>'required'
]);
$image = $request->file('image');
$slug = str_slug($request->title);
if (isset($image))
{
$currentDate = Carbon::now()->toDateString();
$imagename = $slug.'-'.$currentDate.'-'. uniqid() .'.'. $image->getClientOriginalExtension();
$image_resize = Image::make($image->getRealPath());
$image_resize->resize(1600,1066);
if (!file_exists('storage/uploads/post'))
{
mkdir('storage/uploads/post',0777,true);
}
//$image->move('storage/uploads/post',$imagename);
$image_resize->save('storage/uploads/post/'.$imagename);
}else{
$imagename = "default.png";
}
$post = new Post();
$post->user_id = Auth::id();
$post->title = $request->title;
$post->slug = str_slug($request->title);
$post->image = $imagename;
$post->body = $request->body;
$post->price = $request->price;
$post->live_demo = $request->live_demo;
if(isset($request->status))
{
$post->status =true;
}else
{
$post->status = false;
}
$post->is_approved = true;
$post->save();
$post->categories()->attach($request->categories);
$post->tags()->attach($request->tags);
Toastr::success('Post Successfully Save:)','Success');
return redirect()->route('admin.post.index');
}
// Pivot table create category_post column create category_id, post_id.
// Pivot table create post_tag, and column create post_id, and tag_id

Answer 4

$station->products()->sync($request->products , false);