Jade模板未获取Express传递的数据 [英] Jade template doesn't get the data passed from express

问题描述

我知道此问题的标题几乎相同，但问题不同.

I know this questions has almost the same title but the issue is different.

我正在使用内置在最新Keystone.js版本中的Jade模板引擎v.1.11.0.在控制器中，我使用两个 view.on('init')回调查询数据.第一个回调仅查询一条记录，并且始终通过.有时第二个则不然.

I'm using Jade template engine v.1.11.0 built into latest Keystone.js release. In a controller, I query the data with two view.on('init') callbacks. First callback only queries one record and always passes. The second sometimes don't.

category.js

var keystone = require('keystone');
var async = require('async');
exports = module.exports = function (req, res) {

    var view = new keystone.View(req, res);
    var locals = res.locals;

    // Init locals
    locals.section = 'category';
    locals.filters = {
        category: req.params.category
    };
    locals.data = {
        sections: [],
        category: {}
    };

    // Load current category
    view.on('init', function (next) {

        var q = keystone.list('Category').model.findOne({
            key: locals.filters.category
        });

        q.exec(function (err, result) {
            locals.data.category = result;
            locals.section = locals.data.category.name.toLowerCase(); 
            next(err);
        });
    });


    // Load sections
    view.on('init', function (next) {   
        var q = keystone.list('Section').model.find().where('category').in([locals.data.category]).sort('sortOrder').exec(function(err, results) {

            if (err || !results.length) {
                return next(err);
            }

            async.each(results, function(section, next) {
                keystone.list('Article').model.find().where('section').in([section.id]).sort('sortOrder').exec(function(err, articles){
                    var s = section;
                    if (articles.length) {
                        s.articles = articles;
                        locals.data.sections.push(s);
                    } else {
                        locals.data.sections.push(s);
                    }
                });             

            }, function(err) {
                console.log(locals.data.sections);
            });

            next(err);
        });
    });

    view.render('category');
};

在我看来，我应该始终将此通过:

In my view, I should always get this passed:

sections: { _id: 574b909b43ff68163ed86bf2, publicTitle: 'Title 1', key: 'name-1', sortOrder: 3, name: 'Name 1', __v: 0, category: 574b8960947f45f034ac89b4, text: '', image: {} }

category: { _id: 574b8960947f45f034ac89b4, key: 'blabla', sortOrder: 1, name: 'Blabla', __v: 0, image: {} }

但是60％的时间我知道了:

But 60% of the time, I get this:

sections:

category: { _id: 574b8960947f45f034ac89b4, key: 'johndoe', sortOrder: 1, name: 'JohnDoe', __v: 0, image: {} }

奇怪的是，如果我转到另一个类别，其中包含更多部分，并且像30篇文章一样，我有90％的时间获得部分，但仍然缺少10％.这在开发和生产中都将持续存在.

Strange thing is, If I go to another category, which has more sections and like 30 articles, I get sections 90% of the time, but still missing them 10%. This persists in both development and production.

某些" next()"触发得太早了吗?我看不到我搞砸了.

Is some "next()" firing too early? I can't see where I messed up.

推荐答案

好的.在阅读async后，我设法使用async.parallel使它正常工作.

Alright. After some reading on async I managed to get it to work properly using async.parallel.

var keystone = require('keystone');
var async = require('async');
exports = module.exports = function (req, res) {

    var view = new keystone.View(req, res);
    var locals = res.locals;

    // Init locals
    locals.section = 'category';
    locals.filters = {
        category: req.params.category
    };
    locals.data = {
        sections: [],
        category: {}
    };

    // Load current category
    view.on('init', function (next) {

        var q = keystone.list('Category').model.findOne({
            key: locals.filters.category
        });

        q.exec(function (err, result) {
            locals.data.category = result;
            locals.section = locals.data.category.name.toLowerCase();
            getChildrenRecords(locals.data.category, next);
        });
    });


    function getChildrenRecords(category, next){

        var q = keystone.list('Section').model.find().where('category').in([category]).sort('sortOrder').exec(function(err, results) {

            if (err || !results.length) {
                return next(err);
            }

            callItems = [];

            for(var i = 0; i < results.length; i++) {
                var data = results[i];
                callItems.push(makeCallbackFunction(data));
            }

            function makeCallbackFunction(section) {
                return function (callback) {

                    keystone.list('Article').model.find().where('section').in([section.id]).sort('sortOrder').exec(function(err, articles){

                        if (err) return callback(err);

                        if (articles.length) { section.articles = articles; }
                            locals.data.sections.push(section);
                            callback();
                    });
                };
            }

            async.parallel(callItems, function(err, results){
                next(err);
            });
        });
    }


    // Render the view
    view.render('category');
};

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