PHP

make a forign key in migrations using laravel 8

$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

laravel foreign key

Schema::table('posts', function (Blueprint $table) {
    $table->unsignedBigInteger('user_id');

    $table->foreign('user_id')->references('id')->on('users');
});
OR
Schema::table('posts', function (Blueprint $table) {
    $table->foreignId('user_id')->constrained();
});

add foreign key column laravel 5.8

update your `integer('user_id')` to `bigInteger('user_id')`
public function up() { 
        Schema::create('evaluation', function (Blueprint $table) { 
            $table->increments('id'); 
            $table->bigInteger('user_id')->unsigned()->index(); 
            $table->timestamps();
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        });
    }

create foreign key laravel migration

Schema::table('posts', function (Blueprint $table) {
    $table->unsignedBigInteger('user_id');

    $table->foreign('user_id')->references('id')->on('users');
});

laravel 8 foreign key migration

use IlluminateDatabaseSchemaBlueprint;
use IlluminateSupportFacadesSchema;

Schema::table('posts', function (Blueprint $table) {
    $table->unsignedBigInteger('user_id');

    $table->foreign('user_id')->references('id')->on('users');
});

laravel foreign key

//acording to laravel 7>=

Schema::table('posts', function (Blueprint $table) {
    $table->foreignId('user_id')->constrained();
});

//for deffirent table
$table->foreignId('user_id')->constrained('users');

//for taking action
$table->foreignId('user_id')
      ->constrained()
      ->onUpdate('cascade')
      ->onDelete('cascade');

foreign key laravel migration

$table->foreign('column_name')->references('id')->on('table_name')->onDelete('cascade');

add foreign key in laravel migration

$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

laravel 8 foreign key

Schema::table('posts', function (Blueprint $table) {
    $table->foreignId('user_id')->constrained();
});

laravel foreign key

$table->foreignId('user_id')
      ->constrained()
      ->onUpdate('cascade')
      ->onDelete('cascade');

Laravel create foreign key column in migration

$table->foreignId('post_id')
                ->constrained()
                ->onUpdate('cascade')
                ->onDelete('cascade');

Laravel migrations custom foreign key

$table->unsignedBigInteger('created_by');
$table->foreign('created_by')->references('id')->on('users');

How to create foreign key in Laravel

$table->foreign('category_id')->references('id')->on('categories')->onUpdate('cascade')->onDelete('cascade');