不支持connect-session-sequelize的Flash消息

我有一個node.js web應用程序，可在MongoDB和Sequelize（PostgreSQL）之間進行會話切換。對於這兩者，我也在連接閃光（也嘗試快速閃光）中間件的閃光消息層。總之，MongoDB的工作，Sequelize沒有。不支持connect-session-sequelize的Flash消息

該應用程序具有用戶可以編輯的「包」的概念。在用戶成功編輯包後，我設置了一條閃光消息：

"${timestamp} Package ${pkgID} successfully updated."

和重定向。使用Sequelize（connect-session-sequelize），即使我可以在數據庫中看到它，也不會顯示該Flash消息，並且如果我刷新該頁面，則會出現確實。

這裏是Sequelize會話設置：

var cookieParser = require('cookie-parser'); 
var expSession = require('express-session'); 
var flash = require('express-flash'); 

app.use(cookieParser(process.env.COOKIE_SECRET)); 

if (sessionDBVendor === 'postgres') { 
    let models = require('./models/postgres'); 
    var SequelizeSessionStore = require('connect-session-sequelize')(expSession.Store); 
    var sequelizeSessionStore = new SequelizeSessionStore({ 
     db: models.sequelize, 
     table: 'Session' 
    }); 
    sequelizeSessionStore.on('set', function (data) { 
     debug(`SequelizeSessionStore: Session ${data} UPDATED.`); 
    }); 
    app.use(
     expSession({ 
      secret: process.env.COOKIE_SECRET, 
      store: sequelizeSessionStore, 
      resave: false, // we support the touch method so per the express-session docs this should be set to false 
      proxy: false, // if you do SSL outside of node. 
      saveUninitialized: false, 
     }) 
    ); 
} 
app.use(flash());

縱觀連接會話，sequelize源代碼，我發現，我可以添加「連接：會話sequelize」我的DEBUG環境變量來獲得額外的信息在控制檯中。以下是控制檯日誌中有趣的部分，其中包括一些格式，一些空白行和數字。

 connect:session-sequelize INSERT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +5s 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +10ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 

(1) 
    Executing (default): UPDATE "webjmp"."sessions" SET "expires"='2017-02-21 15:53:54.738 +00:00', 
      "data"='{"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"}, 
       "flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}}', 
      "updatedAt"='2017-02-20 15:53:54.756 +00:00' WHERE "sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI' 

(2) 
     connect:session-sequelize FOUND DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI with data 
     {"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"},"flash":{}} +17ms 

    Executing (default): SELECT "Package"."_id", "Package"."title", "Package"."description", 
      {content removed for brevity} 
      FROM "webjmp"."packages" AS "Package" 
      {content removed for brevity} 
      ORDER BY "Package"."timestamp" DESC; 
    ::1 - - [20/Feb/2017:15:53:54 +0000] "POST /packages/58a718a0280081343eeab6d9 HTTP/1.1" 302 62 
     packages ID of package in returned list: 58a718a0280081343eeab6d9 +166ms 
     packages ID of package in returned list: 58a716c35326d0b0380c0b37 +0ms 
     packages ID of package in returned list: 58a474c55c9f18cc31cb0e2a +0ms 
     packages ID of package in returned list: 58a45dfa51f335c015d8591f +0ms 
     packages ID of package in returned list: 589cc7f30a333d1864b07bb2 +0ms 

(3) 
     packages listPackages: flashSuccess: [] +0ms 

     connect:session-sequelize TOUCH "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +92ms 
    Executing (default): UPDATE "webjmp"."sessions" SET "expires"='2017-02-21 15:53:55.023 +00:00', 
      "updatedAt"='2017-02-20 15:53:55.024 +00:00' 
      WHERE "sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI' 
    ::1 - - [20/Feb/2017:15:53:55 +0000] "GET /packages HTTP/1.1" 200 6909 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +14ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" 
      WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 
     connect:session-sequelize SELECT "DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI" +6ms 
    Executing (default): SELECT "sid", "userId", "expires", "data", "createdAt", "updatedAt" 
      FROM "webjmp"."sessions" AS "Session" WHERE "Session"."sid" = 'DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI'; 

(4) 
     connect:session-sequelize FOUND DnVIEQiTfaxKZjYgC7uHmKbelJvJBzrI with data 
      {"cookie":{"originalMaxAge":null,"expires":null,"httpOnly":true,"path":"/"}, 
      "flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}} +3ms

需要注意的是，在（1），更新完成，並在「數據」的更新，「閃」包含的對象：

"flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}

這就是我的提示信息。但是，請注意，在（2），連接會話，sequelize調試吐出來表明它發現會話找到的消息，並在其中顯示了會話對象，閃光燈空：只是在這之後

"flash":{}

在（3）處，我的代碼嘗試檢索「flashSuccess」flash消息，但是它出現了一個空數組。但隨後，在（4），連接會話，sequelize吐出另一個FOUND調試信息，並在它這其中有閃光燈消息：

"flash":{"flashSuccess":["{02/20/2017 10:53:49} Package 58a718a0280081343eeab6d9 was successfully updated."]}

，如果我檢查數據庫，它就在那裏。

這幾乎就像設置Flash消息的UPDATE異步發生，並且在（2）處檢索到會話時還沒有完成，但隨後出現。但是我試着在設置flash消息後拋出一個setTimeout（），但無濟於事。

任何想法這裏發生了什麼？

更新：我添加了第三個會話存儲選項，它使用connect-pg-simple中間件將會話存儲在PostgreSQL中。使用該選項，Flash消息就可以正常工作。 connect-session-sequelize似乎是一個奇怪的人。

來源

2017-02-20 Eric Hill

在這裏回答我自己的問題，但在issues board for connect-session-sequelize上指出express-session在這些flash消息場景中存在競爭條件，並且需要在設置flash消息之後調用req.session.save（cb）返回回調中的回覆，以避免出現這種情況。例如：

req.flash('flashError', err.message); 
req.session.save(function() { 
    res.redirect('/packages'); 
});

這樣做解決了這個問題。

來源

2017-02-21 19:02:32

不支持connect-session-sequelize的Flash消息

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