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从我以前的问题（Symfony2 删除实体，级联异常）

拥有这个实体：

Service\SafetyBundle\Entity\Step2:
    type: entity
    table: step2
    repositoryClass: Service\SafetyBundle\Entity\Step2Repository  
    manyToMany:
       selectedriskassesments:
         targetEntity: SelectedRiskAssesment
         joinTable:
           name: step2_selected_risk_assesments
           joinColumns:
             step2_id:
               referencedColumnName: id
           inverseJoinColumns:
             selected_risk_id:
               referencedColumnName: id 
               onDelete: CASCADE
         cascade: ["persist","remove"]

选定风险评估：

Service\SafetyBundle\Entity\SelectedRiskAssesment:
    type: entity
    table: selectedriskassesment
    repositoryClass: Service\SafetyBundle\Entity\SelectedRiskAssesmentRepository

    manyToOne:
        risk_assesment:
            targetEntity: RiskAssestment
            inversedBy: selectedriskassesment
            joinColumn:
                name: risk_assesment
                referencedColumnName: id
            cascade: ["detach"]
    fields:
        id:
            type: integer
            id: true
            generator:
                strategy: AUTO
        answer:
            type: boolean
    lifecycleCallbacks: {  }

在删除第 2 步时，它会删除所有selectedriskassesments 我不想要的 RiskAssestment 实体。

如果我删除onDelete: CASCADE它会产生一个异常，试图把cascade: ["detach"]但仍然没有

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