Php 处理pivot数据操作的正确方法（via有许多“到”）

在一个基本的博客应用程序中，我有一个文章模块，允许我选择相关的类别。 有3张桌子；文章，文章，分类，分类。扩展ORM的两个模型，

Model\u Article

和

Model\u Category

具有许多相应的“直通”关系。在“编辑文章”表单提交过程中，正确的方式（或更好的方式）是什么：

• 以数组格式检索所有可用的

  类别ID

  ，以填充

  表单：：select（）

• 从透视表中以选定类别的数组格式检索分配的

  类别ID

• 成功提交表单后更新透视表，其中已存在一些透视数据。最好在添加/删除相关数据之前检查现有数据（而不是删除所有现有数据，然后添加所有提交的

  类别ID

  ）

基本上，我希望有一种方法可以在不循环ORM对象的情况下获取pivot数据数组。

$categories_orm = ORM::factory('category')->find_all();
foreach ($categories_orm as $category)
{
    $categories[$categories_orm->id] = $categories_orm->name;   
}

$article = ORM::factory('article', $post['article_id']);

// do stuff (validate, update the article etc.)

// remove all relationships
$article->remove('categories');

// add new relationships
$article->add('categories', $post['categories']);

不确定我的要求是否只能通过数据库准备语句/查询生成器来实现。如果是这样，我是否建议将自己的方法（使用准备好的语句/查询生成器）添加到我的

模型文章extend ORM

我目前使用的方法是：

获取所有类别ID

    $categories_orm = ORM::factory('article_category')->find_all();
    foreach($categories_orm as $category_orm) {
        $categories[$category_orm->id] = $category_orm->name;
    }

    $categories_current = $article->article_categories->find_all();
    foreach($categories_current as $category){
        $categories_selected = $category->id;
    }

    $categories_orm = $article->article_categories->find_all();
    $categories_existing = array();
    foreach($categories_orm as $category){
        $categories_existing[] = $category->id;
    }
    $categories_selected = $this->request->post('category');

    $categories_to_remove = array_diff($categories_existing,$categories_selected);
    $categories_to_add = array_diff($categories_selected,$categories_existing);
    if(!empty($categories_to_remove)) {
        $article->remove('article_categories', $categories_to_remove);
    }
    if(!empty($categories_to_add)) {
        $article->add('article_categories', $categories_to_add);
    }

获取所选类别ID

    $categories_orm = ORM::factory('article_category')->find_all();
    foreach($categories_orm as $category_orm) {
        $categories[$category_orm->id] = $category_orm->name;
    }

    $categories_current = $article->article_categories->find_all();
    foreach($categories_current as $category){
        $categories_selected = $category->id;
    }

    $categories_orm = $article->article_categories->find_all();
    $categories_existing = array();
    foreach($categories_orm as $category){
        $categories_existing[] = $category->id;
    }
    $categories_selected = $this->request->post('category');

    $categories_to_remove = array_diff($categories_existing,$categories_selected);
    $categories_to_add = array_diff($categories_selected,$categories_existing);
    if(!empty($categories_to_remove)) {
        $article->remove('article_categories', $categories_to_remove);
    }
    if(!empty($categories_to_add)) {
        $article->add('article_categories', $categories_to_add);
    }

更新类别ID

    $categories_orm = ORM::factory('article_category')->find_all();
    foreach($categories_orm as $category_orm) {
        $categories[$category_orm->id] = $category_orm->name;
    }

    $categories_current = $article->article_categories->find_all();
    foreach($categories_current as $category){
        $categories_selected = $category->id;
    }

    $categories_orm = $article->article_categories->find_all();
    $categories_existing = array();
    foreach($categories_orm as $category){
        $categories_existing[] = $category->id;
    }
    $categories_selected = $this->request->post('category');

    $categories_to_remove = array_diff($categories_existing,$categories_selected);
    $categories_to_add = array_diff($categories_selected,$categories_existing);
    if(!empty($categories_to_remove)) {
        $article->remove('article_categories', $categories_to_remove);
    }
    if(!empty($categories_to_add)) {
        $article->add('article_categories', $categories_to_add);
    }

---

您可能应该将关系表重命名为

articles\u categories

（两个复数形式）以遵循Kohana约定，

categories

是关系的更好别名

类别模型应用于检索所有类别ID。然后按照与示例相同的方式循环遍历它以填充数组

获取所有类别。

$categories_orm = ORM::factory('category')->find_all();
foreach ($categories_orm as $category)
{
    $categories[$categories_orm->id] = $categories_orm->name;   
}

$article = ORM::factory('article', $post['article_id']);

// do stuff (validate, update the article etc.)

// remove all relationships
$article->remove('categories');

// add new relationships
$article->add('categories', $post['categories']);

确保select元素在数组中提供post值，方法如下所示：

name="categories[]"

更新关系。

$categories_orm = ORM::factory('category')->find_all();
foreach ($categories_orm as $category)
{
    $categories[$categories_orm->id] = $categories_orm->name;   
}

$article = ORM::factory('article', $post['article_id']);

// do stuff (validate, update the article etc.)

// remove all relationships
$article->remove('categories');

// add new relationships
$article->add('categories', $post['categories']);

我可能会使用隐藏的表单字段进行检查，以首先验证类别关系是否需要更新。我可以想象，一篇文章的分类几乎从未改变过