Unable To Create Foreign key In Laravel With Mysql

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I have a project and i have call these 2 commands at the first in my command prompt:

php artisan make:model Music -m
php artisan make:model Artist -m

Then i create a foreign key in music migration file like this :

public function up()
{
    Schema::create('musics', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('artist_id')->unsigned();
        $table->timestamps();
        $table->foreign('artist_id')->references('id')->on('artists');
    });
}

Now when i run migrate command like :

php artisan migrate

But i have a this error :

       Illuminate\Database\QueryException  : SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table `musics` add constraint `musics_artist_id_foreign` foreign key (`artist_id`) references `artists` (`id`) on delete cascade)

  at D:\sites\laravel\MrMusic\vendor\laravel\framework\src\Illuminate\Database\Connection.php:664
    660|         // If an exception occurs when attempting to run a query, we'll format the error
    661|         // message to include the bindings with SQL, which will make this exception a
    662|         // lot more helpful to the developer instead of just the database's errors.
    663|         catch (Exception $e) {
  > 664|             throw new QueryException(
    665|                 $query, $this->prepareBindings($bindings), $e
    666|             );
    667|         }
    668|

  Exception trace:

  1   PDOException::("SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint")
      D:\sites\laravel\MrMusic\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  2   PDOStatement::execute()
      D:\sites\laravel\MrMusic\vendor\laravel\framework\src\Illuminate\Database\Connection.php:458

  Please use the argument -v to see more details.

Note : i will test a few ways like set index to both of fields,...

Ordering issue. You have to create the artists table first. musics.artist_id can't reference a key that doesn't exist yet:

php artisan make:model Artist -m
php artisan make:model Music -m

Migrations are not creating foreign keys · Issue #28051 · laravel , Laravel Version: 5.8.8 PHP Version: 7.2.11 Database Driver & Version: MySQL 5.7.24 - Community Server Description: Migrations are not  Home » Php » Unable To Create Foreign key In Laravel With Mysql Unable To Create Foreign key In Laravel With Mysql Posted by: admin October 20, 2018 Leave a comment

You should have a artists table first then foreign a artist id. First try to create a artist model.

SQLSTATE[HY000]: General error: 1215 Cannot add foreign key , Description: My code for inserting FK is working on 5.7 but not in 5.8. Error creating foreign keys in Laravel 5.8 [General error: 1005] #27839 If you are using MySQL, you must use unsignedBigInteger on your foreign key. I'm trying to create foreign keys in Laravel however when I migrate my table using artisan i am thrown the following error: My migration code is as so: Any ideas as to what I've done wrong, I want to get this right now, as I've got a lot of tables I need to create e.g. Users, Clients, Projects, Tasks, Statuses, Priorities, Types, Teams.

Ensure the artists table migration runs before the musics migration. You can't make a foreign key on nothing!

Also, ensure the column on both tables are identical, in other words both the foreign key column and original primary key must both be unsigned integers in this case.

Finally, it's better practice to include the onUpdate() and onDelete() methods when defining your foreign key contraint, this makes it easier to debug/read later.

In your case you would do:

$table->foreign('artist_id')->references('id')->on('artists')->onUpdate('cascade')->onDelete('cascade');

cant create foreign key, SQLSTATE[HY000]: General error: 1005 Can't create table testing . #sql-​1848_3ae (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table gallery add constraint (The default was changed to InnoDB in MySQL 5.5.​5.) Posted 3 years Proudly hosted with Laravel Forge and DigitalOcean. Laravel this is not only a practical framework, it is also a programming style. mardi 31 juillet 2018. Cannot create foreign key

I dont't have any mistake in create migrations file.

My mistake is in create function for realation in Artist model:

In my Artist.php i used :

public function music(){ ... }

Now i forget to set like this :

public function musics(){ ... }

Should I use foreign keys in my database if I use laravel?, Foreign keys in your database enables data integrity, as you can't delete a parent row if there is a child row in another table. While you can rely on the framework  After a few minutes groking, I realize corresponding columns in the foreign key and the referenced key must have similar data types. The size and sign of integer types must be the same. increments() method set an unsigned integer with auto increment by default in the mysql db. Changing the second table again:

Schema Builder - Laravel, To create a new database table, the Schema::create method is used: If you are using the MySQL database, you may use the after method to specify the order Note: Renaming columns in a table with enum column is currently not supported. Laravel also provides support for adding foreign key constraints to your tables: Renaming Tables With Foreign Keys. Before renaming a table, you should verify that any foreign key constraints on the table have an explicit name in your migration files instead of letting Laravel assign a convention based name. Otherwise, the foreign key constraint name will refer to the old table name. Columns. Creating Columns

Creating Foreign Key in Laravel Migrations (Example), A protip by ravinsharma7 about laravel, migration, and foreign key. It seems directly calling foreign method does not create the column with the set an unsigned integer with auto increment by default in the mysql db. As you can see there is different number of columns in foreign key definition and references definition. Strictly speaking this could be checked during syntax parsing but as MariaDB/MySQL does not fully support foreign keys (for all storage engines) InnoDB does internal parsing for foreign keys.

Just In Case. Laravel, create foreign key in migration, While studying Laravel framework I faced with some not an obvious for me problems. And one day, when I realized that it might be helpful not only  For example, if you have a salmons and a goats table, and you trying to add a foreign key from the transactions table to the ID column in those tables, the migrations for salmons and goats must run first, otherwise you are trying to add foreign keys to tables that don't exist, which makes Laravel mad.

Comments
  • i will now migrate artists befor music but i have same error now!