[英]Node.js: fs.existsSync doesn't work on Heroku
I have a Heroku app using Node.js and Express, and I want to determine whether or not a certain file exists.我有一个使用 Node.js 和 Express 的 Heroku 应用程序,我想确定某个文件是否存在。 However, it seems like the file is never found.
但是,似乎从未找到该文件。 I have the following path:
我有以下路径:
app.get('/sims/:sim_name', (req, res) => {
var simName = req.params.sim_name; // get the name of the requested sim from the URL
// if it exists, render it
if (fs.existsSync(`pages/sims/${simName}.ejs`))
res.render(`pages/sims/${simName}`);
// otherwise, show an error message
else
res.send("Sorry, the page you requested does not exist.");
});
The directory structure of my project looks like this:我的项目的目录结构如下所示:
.
├── Procfile
├── README.md
├── app.json
├── index.js
├── node_modules
│ ├── so many node_modues...
├── package-lock.json
├── package.json
├── public
│ ├── images
│ │ └── ...
│ ├── lang-logo.png
│ ├── node.svg
│ ├── scripts
│ │ └── ...
│ ├── stylesheets
│ │ ├── ...
│ └── test.html
├── test.js
└── views
├── pages
│ ├── index.ejs
│ ├── sims
│ │ └── EField.ejs
└── partials
├── header.ejs
└── nav.ejs
I am doing something wrong here?我在这里做错了什么? Or is this a Heroku issue?
还是这是 Heroku 问题?
The undisciplined way you code is like asking for trouble!乱码的方式就像自找麻烦! Start using curly brackets wherever needed!
在需要的地方开始使用大括号!
Here's the corrected script...这是更正后的脚本...
if (fs.existsSync(`pages/sims/${simName}.ejs`))
{ res.render(`pages/sims/${simName}`);}
else
{ res.send("Sorry, the page you requested does not exist.");}
Ok, I needed to change pages/sims/${simName}.ejs
to views/pages/sims/${simName}.ejs
.好的,我需要将
pages/sims/${simName}.ejs
为views/pages/sims/${simName}.ejs
。
I had previously tried /views/pages/sims/${simName}.ejs
, which didn't work because of how the file paths work in Heroku.我之前尝试过
/views/pages/sims/${simName}.ejs
,但由于文件路径在 Heroku 中的工作方式,它不起作用。
I also added braces, as per the suggestion of @UserToday (although this wasn't necessary).根据@UserToday 的建议,我还添加了大括号(尽管这不是必需的)。
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