用bluebird Promise时遇到的问题,无法执行到all()后的then() - CNode技术社区

具体表现就是,findTagPromise.then(getTagIdList, console.log).all(promises).then(renderRes, console.log);,all这一步的完成了,然后就卡住,一直执行不到后一个then上。

希望能有高人指点,谢谢

bluebird API地址: http://bluebirdjs.com/docs/api-reference.html

app.get('/tag/:tagName', function(req, res, next) {
 var pageInfos = [];
 var promises = [];
 var tmp;
 console.log('begin');
 var findTagPromise = Tag.findOne({name: req.params.tagName}, 'pages').exec(
 function(err, pages) {
 console.log(pages);
 tmp = pages;
 }
 );
 function getTagIdList(err, page) {
 console.log('getTagIdList');
 return new Promise(function(resolve, reject) {
 tmp.pages.forEach(function(pageId) {
 promises.push(Page.findOne({_id: new ObjectId(pageId)}, 'title').exec(function(err, page) {
 if (err) return err;
 console.log('all');
 console.log(page);
 pageInfos.push({
 _id: pageId,
 title: page.title
 });
 }));
 });
 resolve();
 });
 }
 function renderRes(resolve, reject) {
 console.log('renderRes');
 return new Promise(function() {
 res.render('index', {
 pages: pageInfos
 });
 resolve();
 });
 }
 findTagPromise.then(getTagIdList, console.log).all(promises).then(renderRes, console.log);
});

输出结果是: begin { pages: [ 564ae326168a71305daafb62 ], _id: 564ae326168a71305daafb63 } getTagIdList all { title: ‘zzzz’, _id: 564ae326168a71305daafb62 }

getTagIdList 里resolve(promises)