使用 Baum 嵌套集合模型来实现 Laravel 模型的无限极分类

$tagTree = [    'name' => 'RootTag',    'children' => [        ['name' => 'L1Child1',            'children' => [                ['name' => 'L2Child1'],                ['name' => 'L2Child1'],                ['name' => 'L2Child1'],            ]        ],        ['name' => 'L1Child2'],        ['name' => 'L1Child3'],    ]];

composer require "baum/baum:~1.1"

'Baum\Providers\BaumServiceProvider',

php artisan baum:install MODEL

php artisan migrate

class Category extends Migration {  public function up() {    Schema::create('categories', function(Blueprint $table) {      $table->increments('id');         // 这四行代码      $table->integer('parent_id')->nullable();      $table->integer('lft')->nullable();      $table->integer('rgt')->nullable();      $table->integer('depth')->nullable();      $table->string('name', 255);      $table->timestamps();    });  }}

class Category extends Baum\Node {}

class Category extends Baum\Node {  protected $table = 'categories';  // 'parent_id' column name  protected $parentColumn = 'parent_id';  // 'lft' column name  protected $leftColumn = 'lidx';  // 'rgt' column name  protected $rightColumn = 'ridx';  // 'depth' column name  protected $depthColumn = 'nesting';  // guard attributes from mass-assignment  protected $guarded = array('id', 'parent_id', 'lidx', 'ridx', 'nesting');}

$root = Tag::create(['name' => 'Root']);// 创建子标签$child1 = $root->children()->create(['name' => 'Child1']);$child = Tag::create(['name' => 'Child2']);$child->makeChildOf($root);// 批量构建树$tagTree = [    'name' => 'RootTag',    'children' => [        ['name' => 'L1Child1',            'children' => [                ['name' => 'L2Child1'],                ['name' => 'L2Child1'],                ['name' => 'L2Child1'],            ]        ],        ['name' => 'L1Child2'],        ['name' => 'L1Child3'],    ]];Tag::buildTree($tagTree);