PHP Symfony + 一对多关系 + 结果缓存

Question

在使用 Symfony 1.4 定义一对多关系时，我遇到了意想不到的行为（对我来说！）。这是一个演示行为的简单示例，有一个 Employer 表和一个 Employee 表：一个 Employer 可以有多个 Employees。 YML架构文件如下：

Employee:
  columns:
    id: { type: integer, primary: true, autoincrement: true }
    first_name: { type: string(30), notnull: true }
    last_name: { type: string(30), notnull: true }
    employer_id: { type: integer }
  relations:
    Employer:
      local: employer_id
      foreign: id
      type: one
      foreignType: many
      foreignAlias: Workers

Employer:
  columns:
    id: { type: integer, primary: true, autoincrement: true }
    name: { type: string(100) }
    line1: { type: string(100) }
    city: { type: string(100) }
    state: { type: string(10) }

因此，在 Employer 上调用 getWorkers() 应该返回与 Employer 关联的员工。当getWorkers() 第一次被调用时，我得到了这个预期的行为。

但是，在后续调用中，如果已向雇主添加了额外的员工（以编程方式或直接在数据库 [MySQL] 中），getWorkers() 调用仍会返回第一个结果。

我已通过单步执行 getWorkers() 调用的 Symfony 源来验证，在后续调用中，它会返回存储在 _references 数组中的缓存值。

如果我以编程方式跟踪外键，通过employee_id 查询Employee，那么我会得到完整的结果集。

谁能解释这种行为？

这是我在“动作”中运行的一些示例 PHP 代码，它演示了行为：

// Create common employer.
$employer = new Employer();
$employer->setName("My Employer");
$employer->setLine1("100 Main Street");
$employer->setCity("AnyTown");
$employer->setState("State");
$employer->save();

// Create two employees,
$worker1 = new Employee();
$worker1->setFirstName("John");
$worker1->setLastName("Doe");
$worker1->setEmployer($employer);
$worker1->save();

$worker2 = new Employee();
$worker2->setFirstName("Jane");
$worker2->setLastName("Smith");
$worker2->setEmployer($employer);
$worker2->save();

$myEmployer = Doctrine_Core::getTable('Employer')->findOneBy('name', 'My Employer');
$workers = $myEmployer->getWorkers();
echo "Number of workers for " . $myEmployer->getName() . ' is ' . count($workers);
// This gives the expected 2 employees.

// Now create another employee in the common employer.
$worker3 = new Employee();
$worker3->setFirstName("Anne");
$worker3->setLastName("Droid");
$worker3->setEmployer($employer);
$worker3->save();

$myEmployer = Doctrine_Core::getTable('Employer')->findOneBy('name', 'My Employer');
$workers = $myEmployer->getWorkers();
echo "Number of workers for " . $myEmployer->getName() . ' is ' . count($workers);
// This still gives 2 employees, whereas there are 3 in the DB.

// Follow FK directly.
$workers = Doctrine_Core::getTable('Employee')->findBy('employer_id', $myEmployer->getId());
echo "Number of workers for " . $myEmployer->getName() . ' is ' . count($workers);
// This gives the expected 3 employees.

如何强制它每次都重新关注关系？

Answer 1

添加新的相关记录时，您可能需要刷新记录的关系。

你可以做任何一个：

$worker->refresh(true);
$worker->refreshRelated();
$worker->refreshRelated('Employer');

有关更多信息，您应该检查以下内容： Doctrine Documentation - Refreshing Relationships