我正在使用 ejs 和 mongoose 制作一个 express 应用程序。

我收到这个错误:

 Error: Failed to lookup view "error" in views directory "/Users/ben/Documents/csMSc/web/site/app/views"
at EventEmitter.app.render (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/application.js:555:17)
at ServerResponse.res.render (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:938:7)
at module.exports (/Users/ben/Documents/csMSc/web/site/app/app.js:94:7)
at Layer.handle_error (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/layer.js:58:5)
at trim_prefix (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:300:13)
at /Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:270:7
at Function.proto.process_params (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:321:12)
at IncomingMessage.next (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:261:10)
at fn (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:933:25)
at EventEmitter.app.render (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/application.js:557:14)
at ServerResponse.res.render (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:938:7)
at app.use.res.render.message (/Users/ben/Documents/csMSc/web/site/app/app.js:83:9)
at Layer.handle_error (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/layer.js:58:5)
at trim_prefix (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:300:13)
at /Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:270:7
at Function.proto.process_params (/Users/ben/Documents/csMSsc/web/site/app/node_modules/express/lib/router/index.js:321:12)   

从对 res.render() 的两次调用中，传入的数据从 mongoose 查询返回，例如:

  if(req.query.author !== undefined) {
        var author = req.query.author;
        Post.find().where('author').equals(author).sort({ created: -1 }).limit(10).exec(function(err, authorsPosts) {
            if (err) return res.send("error");
            if(authorsPosts.length==0) {
                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: authorsPosts,
                    error: "Sorry there are no posts with that tag."
                });
            } else {
                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: authorsPosts
                });
            }
        });
    }

另一个是相同的，但查询为

    Post.find( { tags : { $elemMatch: { $in : tagList } } } ).limit(10).exec(function(err, taggedPosts) {

但是我在这个 View 上的所有其他渲染调用都工作正常，包括稍后在同一函数中的调用:

 //or just latest
    Post.find().sort({ created: 1 }).limit(10).exec(function(err, latestPosts) {
        if (err) return res.send(err);
        res.render('pages/index', {
            viewDataSignStatus: viewDataSignedIn[signedIn],
            previews: latestPosts
        });
    });

我很确定 latestPosts 的格式与上面的 authorsPosts 完全相同。

没有调用来呈现名为错误的 View 。

传递给上面对 res.render('pages/index') 的一些调用的错误数据是使用自定义过滤器传递的

//custom ejs filter, sets to default value if data not supplied
ejs.filters.get = function(obj, prop, def) {
  return obj[prop] === undefined ? def : obj[prop];
};

在文件 app/views/pages/index.ejs 中显示为

<p><%=: locals | get:'error','' %> </p>

我的 ejs 设置如下:

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.engine('ejs', require('ejs').renderFile);

这是整个令人讨厌的路线功能的可怕荣耀

router.get('/', function(req, res, next) {
    var accountController = new AccountController(User, req.session);
    console.log("here1");
    var signedIn = accountController.session.userProfileModel !== undefined ? 1 : 0;
    console.log("here2");

    //Author search
    if(req.query.author !== undefined) {
        var author = req.query.author;
        Post.find().where('author').equals(author).sort({ created: -1 }).limit(10).exec(function(err, authorsPosts) {
            if (err) return res.send("error");
            console.log("\n\nAuthorsPosts:" +authorsPosts);
            console.log("\n\authorsPosts.length: " +authorsPosts.length);
            console.log("authors post.constructor = " +authorsPosts.constructor);
            if(authorsPosts.length==0) {
                console.log("length=0");
                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: authorsPosts,
                    error: "Sorry there are no posts with that tag."
                });
            } else {
                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: authorsPosts
                });
            }
        });
    }
    //Tag search
    if(req.query.filter !== undefined) {
        var tagList = req.query.filter.constructor == Array ? req.query.filter : req.query.filter.split(",");
        Post.find( { tags : { $elemMatch: { $in : tagList } } } ).limit(10).exec(function(err, taggedPosts) {
            if (err) return res.send("error");
            console.log("\n\taggedPosts.length: " +taggedPosts.length);
            if(taggedPosts.length==0) {
                console.log("length=0");

                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: taggedPosts,
                    error: "Sorry there are no posts with that tag."
                });
            } else {
                console.log("\n\ntaggedPosts:\n\n" +taggedPosts);
                res.render('pages/index', {
                    viewDataSignStatus: viewDataSignedIn[signedIn],
                    previews: taggedPosts
                });
            }
        });
    }
    //or just latest
    Post.find().sort({ created: 1 }).limit(10).exec(function(err, latestPosts) {
        if (err) return res.send(err);
        res.render('pages/index', {
            viewDataSignStatus: viewDataSignedIn[signedIn],
            previews: latestPosts
        });
    });
});

更重要的是，它并非完全不起作用。当代码到达那些呈现调用时，它会抛出错误并且页面通常会卡住，您无法单击任何链接，然后如果我重新加载一次或两次它就会工作，并使用正确的数据呈现模板。

此外，当我使用这些查询字符串之一前往“/”时，例如GET/?filter=Marc%20Behrens 它尽可能打印所有返回的帖子，然后抛出错误。

谢谢!

编辑:感谢 Alex Ford。

新错误是:

Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (http.js:690:11)
    at ServerResponse.header (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:700:10)
    at ServerResponse.send (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:154:12)
    at ServerResponse.json (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:240:15)
    at ServerResponse.send (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/response.js:142:21)
    at module.exports (/Users/ben/Documents/csMSc/web/site/app/app.js:100:9)
    at Layer.handle_error (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/layer.js:58:5)
    at trim_prefix (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:300:13)
    at /Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:270:7
    at Function.proto.process_params (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:321:12)
    at next (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:261:10)
    at Layer.handle_error (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/layer.js:60:5)
    at trim_prefix (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:300:13)
    at /Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:270:7
    at Function.proto.process_params (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:321:12)
    at next (/Users/ben/Documents/csMSc/web/site/app/node_modules/express/lib/router/index.js:261:10)

最佳答案

我对“headers already sent”错误的猜测是，即使上述 if 语句之一运行，您的 //或最新的 代码仍在运行。如果是这种情况，那么您肯定会多次调用 res.render 或 res.send。试试这个:

router.get('/', function(req, res, next) {

  /* ... */

  //Author search
  if(req.query.author !== undefined) {
    /* ... */
      if(authorsPosts.length==0) {
        res.render(/*...*/);
      } else {
        res.render(/*...*/);
      }
    /* ... */
  }
  //Tag search
  else if(req.query.filter !== undefined) {
    /* ... */
      if(taggedPosts.length==0) {
        res.render(/*...*/);
      } else {
        res.render(/*...*/);
      }
    /* ... */
  }
  //or just latest
  else {
    res.render(/*...*/);
  }
});

关于node.js - Node express ejs 错误 : Failed to lookup view "error" in views directory，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30651121/