小编ips*_*sum的帖子

在SQL中它应该如下所示:

SELECT * FROM `categories_description_old` WHERE ((`categories_description` = '') OR (`categories_name` = '') OR (`categories_heading_title` = ''))

我(丑陋)的解决方案:

conditions = [:categories_name, :categories_heading_title, :categories_description]
b = table_categories_description_old.filter(conditions.pop => "")
conditions.each do |m|
 b = b.or(m => "")
end

是否有更好的解决方案来链接或条件？

当我运行Thor任务时,是否可以先调用特定任务？

我的Thorfile:

class Db < Thor

  desc "show_Version", "some description ..."
  def show_version # <= needs a database connection
    puts ActiveRecord::Migrator.current_version
  end

  private

  def connect_to_database # <= call this always when a task from this file is executed
    # connect here to database
  end

end

我可以在每个任务中编写"connect_to_database"方法,但这看起来不是很干.

我在正确设置教义映射时遇到问题。

我有一个CashRegister实体，该实体具有容器位置和返回容器位置。两个位置都来自相同的类型（BinLocation实体）。

从发出CashRegister，CashRegister->getBinLocations()并且CashRegister->getReturnBinLocations()工作正常，但是如何实现BinLocation->getCashRegisters()返回所有CashRegister引用的实体（binLocation+ returnBinLocation）？

/**
 * CashRegister
 *
 * @ORM\Table(name="cash_registers")
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class CashRegister
{

    ...

    /**
     * @var BinLocation
     *
     * @ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters")
     * @ORM\JoinColumn(name="bin_location_id", referencedColumnName="id")
     */
    private $binLocation;

    /**
     * @var BinLocation
     *
     * @ORM\ManyToOne(targetEntity="BinLocation", inversedBy="cashRegisters")
     * @ORM\JoinColumn(name="return_bin_location_id", referencedColumnName="id")
     */
    private $returnBinLocation;


    /**
     * @return BinLocation
     */
    public function getBinLocation()
    {
        return $this->binLocation;
    }

    /**
     * @return BinLocation …