mongodb：insertMany出错

Question

我正在尝试使用insertMany在Group集合中插入多个'groups'，但它（在插入第一个项目后总是引发错误..

>db.groups.insertMany([{"name":"GroupA","description":"Description GroupA"},
{"name":"GroupB","description":"Description GroupB"},
{"name":"GroupC","description":"Description GroupC"}])

插入第一项

{ "_id" : ObjectId("593ad787da6a6eba2994dfb6"), "name" : "GroupA", 
"description" : "Description GroupA" }

错误

2017-06-09T19:14:47.537+0200 E QUERY    [thread1] BulkWriteError: write error at item 1 in bulk operation :
BulkWriteError({
        "writeErrors" : [
                {
                        "index" : 1,
                        "code" : 11000,
                        "errmsg" : "E11000 duplicate key error collection: cockpit-api-test.groups index: roles.name_1 dup key: { : null }",
                        "op" : {
                                "_id" : ObjectId("593ad787da6a6eba2994dfb7"),
                                "name" : "GroupB",
                                "description" : "Description GroupB"
                        }
                }
        ],
        "writeConcernErrors" : [ ],
        "nInserted" : 1,
        "nUpserted" : 0,
        "nMatched" : 0,
        "nModified" : 0,
        "nRemoved" : 0,
        "upserted" : [ ]
})
BulkWriteError@src/mongo/shell/bulk_api.js:372:48
BulkWriteResult/this.toError@src/mongo/shell/bulk_api.js:336:24
Bulk/this.execute@src/mongo/shell/bulk_api.js:1173:1
DBCollection.prototype.insertMany@src/mongo/shell/crud_api.js:302:5
@(shell):1:1

怎么了？ 感谢您的反馈

群组模型

/**
 * Role Schema
 */
const RoleSchema = new Schema({
  name: { type: String, unique: true, required: true },
  description: { type: String, required: false, trim: true, },
  createdAt: { type: Date, default: Date.now }
});

/**
 * Group Schema
 */
const GroupSchema = new Schema({
  name: { type: String, unique: true, required: true },
  description: { type: String, required: false, trim: true, },
  roles: [RoleSchema],
  createdAt: { type: Date, default: Date.now }
});

Answer 1

我认为问题是您在进行批量写入时没有将Observable.defer(() -> someCondition() ? service.setSolicitation("Berlin", getString(R.string.api_key)) : service.createSolicitation(....) ) .subscribeOn(Schedulers.io()) // Read results in Android Main Thread (UI) .observeOn(AndroidSchedulers.mainThread()) .subscribe(this::processError); 或roles.name插入您的mongo。默认情况下，如果没有定义，mongo会将其设置为null。

首次运行时，您的代码会在数据库中插入null，因为roles.description未定义

roles

第二次运行{"name":"GroupA","description":"Description GroupA", "roles": {"name": null, "description": null } 仍未定义，因此将输入另一个空值

roles

您的{"name":"GroupB","description":"Description GroupB", "roles": {"name": null, "description": null} 不允许重复的RoleSchema值，因为您设置了name

抛出错误中的unique: true指出了重复的空错误。