PHP

foreignId in laravel

// for laravel 7 or above. 
$table->foreignId('user_id')->constrained();
/*-----------OR---------------*/
$table->foreignId('user_id')->constrained('users');

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');
});

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 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');