通过ID获取记录,并在Laravel 5中递归所有foreging

Question

我有两个表,看起来(迁移):

Schema::create('sets', function(Blueprint $table)
{
    $table->increments('id');

    $table->string('key');

    $table->string('name');

    $table->string('set_type');

    $table->integer('belongs_to')->unsigned();

    $table->timestamps();

    $table->foreign('belongs_to')->references('id')->on('sets')->onDelete('cascade');

});

Schema::create('posts', function(Blueprint $table)
{
    $table->bigIncrements('id');

    $table->bigInteger('user_id')->unsigned();

    $table->bigInteger('set_id')->unsigned();

    $table->string('post_type', 25);

    $table->text('post');

    $table->boolean('is_reported')->default(false);

    $table->boolean('is_hidden')->default(false);

    $table->timestamps();

    $table->foreign('user_id')->references('id')->on('users');
    $table->foreign('set_id')->references('id')->on('sets');

});

'set'表用于存储应该查看帖子的位置(国家,城市......)的数据.例如,让我们存储一些国家:

   id | key               | name        | belongs_to
   1  | europe            | Europe      | null
   2  | germany-all       | Germany     | 1
   3  | germany-berlin    | Berlin      | 2
   4  | germany-frankfurt | Frankfurt   | 2
   5  | poland-all        | Poland      | 1
   6  | poland-warsaw     | Warsaw      | 5
   7  | england-all       | England     | 1

并且,我的帖子set_id为6.从逻辑上看,当我想要从欧洲获得帖子(ID 1)时,该帖子也应该被返回,因为6属于5,而5属于1.这就是我想要的去做.可以不使用过多的PHP吗？

Answer 1

好的,我找到了最好的解决方案.这是嵌套集模式.我使用了baum包,看起来:

对于sets表格我添加了Baum的colums:

Schema::create('sets', function(Blueprint $table) {
   $table->bigIncrements('id');
   $table->integer('parent_id')->nullable()->index();
   $table->integer('lft')->nullable()->index();
   $table->integer('rgt')->nullable()->index();
   $table->integer('depth')->nullable();

   $table->string('key');
   $table->string('name');
   $table->string('set_type');

   $table->timestamps();
});

并做了!只需获取set_id并返回帖子,例如:

$sets = Set::where('key', '=', $myKey)->first()->getDescendantsAndSelf()->lists('id');
$posts = Post::whereIn('set_id', $sets)->with(['user'])->take(6)->get();

我留下这个给后代;)