Laravel 7+ Foreign Keys

From Laravel 7, in migrations you don't need to write two lines for relationship field - one for the field and one for foreign key. Use method foreignId().

 1// Before Laravel 7
 2Schema::table('posts', function (Blueprint $table)) {
 3    $table->unsignedBigInteger('user_id');
 4    $table->foreign('user_id')->references('id')->on('users');
 5}
 6 
 7// From Laravel 7
 8Schema::table('posts', function (Blueprint $table)) {
 9    $table->foreignId('user_id')->constrained();
10}
11 
12// Or, if your field is different from the table reference
13Schema::table('posts', function (Blueprint $table)) {
14    $table->foreignId('created_by_id')->constrained('users', 'column');
15}