Question

使用MongoDB存储在线教育应用程序的成绩。下面是我存储在mongoDB数据库中的classRoom文档。 StudentGradeObjs存储在GradeObject内的数组中。 GradeObjs存储在教室内的GradeObjects数组中。

将GradeObjs视为＆＃34; hw1＆＃34;，＆＃34; assignment2＆＃34;等。和studentGradeObjs一样，学生如何完成任务。

{
"_id" : ObjectId("5a01d9e3a91726026cb2e52b"),
"name" : "Bio 212",
"teacherUsername" : "Mike",
"studentArray" : [ 
    "5a00cfd4ae1c8a0114d61095", 
    "59ff75021365601935b674d0", 
    "59ff6282fe19e01fdcc2f505"
],
"gradeObjs" : [ 
    {
        "gradeName" : "hw1",
        "gradeValueMax" : 20,
        "dueDate" : "12/12/12",
        "studentGrades" : [ 
            {
                "username" : "james",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }, 
            {
                "username" : "DickButt",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }, 
            {
                "username" : "john",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }
        ]
    }, 
    {
        "gradeName" : "hw2",
        "gradeValueMax" : 30,
        "dueDate" : "4/4/15",
        "studentGrades" : [ 
            {
                "username" : "james",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }, 
            {
                "username" : "john",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }, 
            {
                "username" : "DickButt",
                "gradeValue" : null,
                "submissionDate" : null,
                "isSubmitted" : false
            }
        ]
    }
],
"studentGrades" : {
    "gradeValue" : 69,
    "1" : {
        "gradeValue" : 69
    }
}

}

如何更新gradeValue数组中的单个studentsGrades属性？我的查询看起来像这样

classCollection.updateOne({$and: [{_id: ObjectId(classID)}, {"gradeObjs.gradeName": gradeName}]}, {$set: {"studentGrades.$.gradeValue": value}}, function(err, thing){

Answer 1

我以不同的方式完成了这项工作。相反，我只是使用一些for循环来计算索引，然后使用找到的索引执行updateOne。

MongoDB Update对象在数组中的对象中的对象中

1 个答案: