我正在编写一个嵌套代码,尝试使用async.waterfall或async.series,但每次刷新时我都会得到随机结果。这似乎是因为前两个函数的查询随机完成。
第一个查询正在排序到committed_date DESC。但是当我添加2个子查询时。排序变得歪曲。
Step1:循环登陆页面 Step1.1 - 获取details1存储库 Step1.2 - 获取details2版本 第2步:构建数组
db.collection('landingpages').find({is_deleted:{$ne:1}}).sort({committed_date:-1}).limit(10).toArray(function(err, db_results) {
var data_array = [];
var x=1;
if(db_results.length == 0) {
return_data.lps = data_array;
parallel_done();
}else{
async.each(db_results, function (db_results1, cb) {
async.watefall(
[
function(callback) {
//if this is removed or passed as callback(null, ""); the sort is fixed from committed - 1
var data_repo = {};
db.collection('repositories').find({repository_id: repository_id}).toArray(function(err, db_results1) {
if(db_results1.length == 0){
var data_repo = {};
callback(null, data_repo);
}else{
var data_repo = db_results1[0];
callback(null, data_repo);
}
});
},
function(callback) {
//if this is removed or passed as callback(null, ""); the sort is fixed from committed - 1
var data_version = {};
db.collection('versions').find({landingpage_id: landingpage_id}).sort({_id:-1}).limit(1).toArray(function(err, db_results1) {
if(db_results1.length == 0){
var data_version = {};
callback(null, data_version);
}else{
var data_version = db_results1[0];
callback(null, data_version);
}
});
}
],
function (err, data_repo,data_version) {
var document = {
"x": x++,
"landingpage_id": db_results1.landingpage_id,
"repository_id": db_results1.repository_id,
"version_id": data_version.version_id,
"val": db_results1,
"data_repo": data_repo,
"data_version": data_version,
};
data_array.push(document);
if(data_array.length == db_results.length) {
return_data.lps = data_array;
}
}
);
});
}
});