Laravel 4-如何设置多个外键

Question

I have 3 tables: member, team and teammember. Each team can have multiple members, but they must not be repeated. Also, members can be in many teams at the same time.

I want to setup the table teammember so that you can't add the same member to the table twice. In my migration I have this:

Schema::create('teammembers', function(Blueprint $table) {
    $table->increments('id');
    $table->integer('team_id');
    $table->integer('member_id');
}

I know how to setup the foreign keys by themselves, but in my case I need the restriction to only affect the combination of both keys, for the reasons explained before.

Answer 1

$table->unique(['team_id','member_id'])将创建完整的唯一索引，但是仍然使用attach方法将尝试向数据透视表中添加新行，因此需要小心。