实体之间的转换

Question

我对symfony2有疑问。我有一个实体集合，我想以某种方式将其转换为一个包含其他类型实体的集合。什么是最好的方式？我知道我可以制作一个简单的循环，将它放在控制器中并覆盖它，但我知道这不是正确的方法。

对于表单，我们有DataTransformer来处理这类问题，但我能做些什么呢？这样做的正确方法是什么？

我必须将Material转换为MaterialJournalItem。没有费心去添加php代码，因为它更短，但仍然代表着相同的东西。

R34\StockServiceBundle\Entity\Material:
    type: entity
    table: material
    repositoryClass: R34\StockServiceBundle\Entity\MaterialRepository
    id:
        id:
            type: integer
            id: true
            generator:
                strategy: AUTO
    fields:
        name:
            type: string
            length: 255
        unit:
            type: string
            length: 16
        quantity:
            type: decimal
            scale: 2
        lowerLimit:
            column: lower_limit
            type: integer
        price:
            type: decimal
            scale: 2
        bookingAmount:
            column: booking_amount
            type: decimal
            scale: 2
    lifecycleCallbacks: {  }
    manyToOne:
      materialCategory:
        targetEntity: R34\StockServiceBundle\Entity\MaterialCategory
        inversedBy: materials
        joinColumn:
          name: material_category_id
          referencedColumnName: id

R34\StockServiceBundle\Entity\MaterialJournalItem:
    type: entity
    table: null
    repositoryClass: R34\StockServiceBundle\Entity\MaterialJournalItemRepository
    id:
        id:
            type: integer
            id: true
            generator:
                strategy: AUTO
    fields:
        name:
            type: string
            length: 255
        category:
            type: string
            length: 255
        quantity:
            type: decimal
            scale: 2
        unit:
            type: string
            length: '16'
        price:
            type: decimal
            scale: 2
    lifecycleCallbacks: {  }
    manyToOne:
      materialJournal:
        targetEntity: R34\StockServiceBundle\Entity\MaterialJournal
        inversedBy: materials
        joinColumn:
          name: material_journal_id
          referencedColumnName: id