我正在尝试按此方法执行批量插入:
'createTestQuestionBatch'(limit) {
check(limit, Number);
if (Meteor.isServer) {
const questionItem = {
question: "Question will be reconstructed with a number",
category: "n3f98f4b22v948nb4v2fg4b89",
answer: ["Yes", "No", "Maybe", "Probably"],
localization: "en",
testQuestion: true,
};
var bulk = Question.rawCollection().initializeUnorderedBulkOp();
for (var i = 0; i < limit; i++) {
questionItem.question = "Is this test question number " + i + "?";
bulk.insert(questionItem);
}
bulk.execute(function (err) {
if (err) {
throw new Meteor.Error('createTestQuestionBatch', 'Bulk update operation failed.' + err);
} else {
console.log("Bulk question creation operation completed. " + limit + " items has been inserted.");
}
});
} else {
console.log("Bulk operation for creating tests are running on the server. Server logs will notify when operation has completed.");
}
}
在尝试添加100个测试题时,如何才会插入编号为99的项目?我正在运行流星1.3。
答案 0 :(得分:1)
问题是您在迭代过程中将同一个对象传递给insert()
。
mongo
驱动程序不克隆插入的文档。相反,如果不存在,则为它生成_id
,并将其添加到其操作列表中。
_id
仅在您的案例的第一次迭代中生成,因此基本上指示MongoDB使用save _id
插入100个文档。这导致只有1个实际文件插入。
要解决此问题,请在每次迭代中传递一个新对象。