Deleting a table row in relations with another tables - php

Question

I have a Post table with the following fields (id, name, state_id, city_id, category_id, subcategory_id)
and PostPhoto table with the following fields (id, photo_url, post_id)
The Post Model has
public function user(){
return $this->belongsTo(User::class);
}
public function category(){
return $this->belongsTo(Category::class);
}
public function subCategory(){
return $this->hasOne(SubCategory::class);
}
public function photos(){
return $this->hasMany(PostPhoto::class);
}
public function city(){
return $this->belongsTo(City::class);
}
and PostPhoto Model has
public function post()
{
return $this->belongsTo(Post::class);
}
Now if I want to delete a particular post, it'll fail due to foreign key constrains. How do I delete the Post together with postphotos associated with it completely from database. And each post can have multiple photos also. Please any suggestion will be appreciated. Thanks

Answer 1

Either you can make post_id as a foreign key and make cascade relation on update and delete which will automatically delete post photos on post deletion.
otherwise, you can try below code.
try {
\DB::beginTrasaction();
PostPhotos::where('post_id', 'your-post-id')->delete();
Post::where('id', 'your-post-id')->delete();
\DB::commit();
} catch(\Exception $exception) {
\DB::rollback();
}

Answer 2

In your Post model add booted method .boot method will call whenever model executes.if you are calling post delete then static deleting closure will exicutes
if you are using latest larvel 8
protected static function booted()
{
static::deleting(function($post) {
$post->photos()->delete();
});
}
if you are using older laravel version then
protected static function boot()
{
parent::boot();
static::deleting(function($post) {
$post->photos()->delete();
});
}
Update
$post=Post::find($id);
$post->photos()->delete();
$post->delete();