mongodb - Grails GORM Mongo hasMany关联未保存

Question

我有一个具有一对多关联的域类。看起来像这样:

class FormResponse {

    static String DRAFT = 'Draft'
    static String SUBMITTED = 'Submitted'
    static String REJECTED = 'Rejected'
    static String APPROVED = 'Approved'

    static mapWith = "mongo"

    ObjectId id
    Date dateCreated
    Date lastUpdated
    User createdBy
    User updatedBy
    Form form
    String currentStatus = DRAFT
    List<FormSectionResponse> formSectionResponses
    List<FormResponseComment> formResponseComments

    static hasMany = [ formSectionResponses: FormSectionResponse, formResponseComments: FormResponseComment ]

    static mapping = {
    }

    static constraints = {
        updatedBy nullable: true
    }

}

FormResponseComment的域类:

class FormResponseComment {

    static mapWith = "mongo"

    ObjectId id
    Date dateCreated
    Date lastUpdated
    User createdBy
    String comment

    static belongsTo = [FormResponse]

    static mapping = {
    }

    static constraints = {
    }

}

我有一个用于保存此对象的 Controller 方法，如下所示:

def saveFormResponse(FormResponse formResponse) {
   def saved = formService.saveFormResponse(formResponse)
   respond(saved)
}

以及服务方法:

def saveFormResponse(response) {
    return response.save(flush: true, failOnError: true)
}

当我发布到此方法时，我可以看到formResponseComments列表已按预期填充:



并保存FormResponseComment:



但是FormResponse对象没有收到与子FormResponseComment的关联:



那么，为什么这里没有建立联系呢？

Grails 3.3.3。

Answer 1

通过向FormResponseComment域类添加向后引用来进行修复，如下所示:
static belongsTo = [formResponse: FormResponse]