laravel migrations unique code example

Example 1: 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();
});

Example 2: laravel migration add unique column

Schema::table('tableName', function($table)
{
    $table->string('column-name')->unique(); //notice the parenthesis I added
});

Example 3: laravel before migration

Schema::table('users', function ($table) {
    $table->string('email')->after('id')->nullable();
});

Example 4: migrate to an existing table in laravel commad

public function up()
{
    Schema::table('users', function($table) {
        $table->integer('paid');
    });
}