多对多关联学说2中的唯一列答案

【问题标题】：Unique column in many to many association doctrine 2多对多关联学说2中的唯一列
【发布时间】：2015-09-03 12:27:01
【问题描述】：

我在 yaml 文档中使用了一对多、单向和联接表关联，但在数据库中没有创建唯一约束。

我正在使用 postgres。我做错了什么？

这是我的实体，它有两个“一对多、单向和连接表”关联“问题”和“答案”

TestCasesPersistence\Entities\GroupQA:
    type: entity
    table: group_qa
    id:
        id:
            type: integer
            nullable: false
            length: null
            fixed: false
            id: true
            column: id
            generator:
                strategy: IDENTITY
    fields:
        name:
            type: string
            nullable: true
            length: null
            fixed: false
            column: name
        timeCreated:
            type: datetime
            nullable: true
            column: time_created
    manyToMany:
        questions:
            targetEntity: Question
            joinTable:
                name: group_qa_questions
            joinColumns:
                group_qa_id:
                    referencedColumnName: id
            inverseJoinColumns:
                question_id:
                    unique: true
                    referencedColumnName: id
        answers:
            targetEntity: Answer
            joinTable:
                name: group_qa_answers
            joinColumns:
                group_qa_id:
                    referencedColumnName: id
            inverseJoinColumns:
                answer_id:
                    unique: true
                    referencedColumnName: id
        typeSearches:
            targetEntity: TypeSearch
            joinTable:
                name: group_qa_type_searches
            joinColumns:
                group_qa_id:
                    referencedColumnName: id
            inverseJoinColumns:
                type_search_id:
                    referencedColumnName: id
    lifecycleCallbacks: {  }

文档http://doctrine-orm.readthedocs.org/en/latest/reference/association-mapping.html

第 5.6 节

【问题讨论】：

标签： postgresql doctrine-orm

【解决方案1】：

我在“答案”和“问题”关联的 yaml 配置中有一个错误

正确方法：

manyToMany:
    questions:
        targetEntity: Question
        joinTable:
            name: group_qa_questions
            joinColumns:
               group_qa_id:
                  referencedColumnName: id
            inverseJoinColumns:
               question_id:
                  unique: true
                  referencedColumnName: id
    answers:
        targetEntity: Answer
        joinTable:
           name: group_qa_answers
           joinColumns:
              group_qa_id:
                 referencedColumnName: id
           inverseJoinColumns:
              answer_id:
                 unique: true
                 referencedColumnName: id

【讨论】：