[英]Async.whilst inside async.series
我在async.whilst
使用async.waterfall
,在这样的async.series
(它只崩溃一次,但随后继续它应该):
function(callback){
async.whilst(
function() {
console.log("Number of things left: " + classes.length); return classes.length > 0;
},
function(innerCallback){
//Define some variables.
async.waterfall([
function (next) {
MyTable.find({ Data: theData},{ DataThis:1, Stuff:1, _id:0 },next).limit(1);
},
function (results, next) {
if(results.length > 0 && results[0].theData=== parseInt(theInfo)){
//Update my database
} else{
next();
}
}
], setTimeout(function() {
//Splice the data. I.e. mydata.splice(i-1,1);
innerCallback();
}, 0)); //closing async.waterfall.
},
function(err){
// The final function of whilst
callback(err);
}) // Whilst finished
}
但是我收到一个错误:
serverClasses2-3 TypeError: undefined is not a function
serverClasses2-3 at /home/node_modules/async/lib/async.js:52:16
serverClasses2-3 at /home/node_modules/async/lib/async.js:1204:30
serverClasses2-3 at /home/routes/indexClasses2.js:267:11
serverClasses2-3 at Query.callback (/home/node_modules/mongoose/lib/query.js:2021:7)
serverClasses2-3 at /home/node_modules/mongoose/node_modules/kareem/index.js:177:19
serverClasses2-3 at /home/node_modules/mongoose/node_modules/kareem/index.js:109:16
serverClasses2-3 at process._tickDomainCallback (node.js:381:11)
有人遇到过同样的错误吗?
您将setTimeout(…, 0)
作为回调传递给async.waterfall
。 它不应该是undefined
,而是一个计时器对象,但它仍然不可调用,并会抛出这样的错误。
相反,只需直接传递回调:
async.waterfall([…], innerCallback)
或者如果需要执行更多操作,请在超时周围使用函数表达式。
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