public function up()
    {
        Schema::table('shops', function (Blueprint $table) {
            $table->string('namespace')->nullable(true)->default(null);
        });
    }
public function up()
    {
        Schema::table('shops', function (Blueprint $table) {
            $table->string('namespace')->nullable(true)->default(null);
        });
    }
public function up ( ) { Schema :: table ( 'shops' , function ( Blueprint $ table ) { $ table -> string ( 'namespace' ) -> nullable ( true ) -> default ( null ) ; } ) ; }
Run the migrations.

@return void
Run the migrations .