如何在所有路由文件中使用app.js变量？

Question

How to use clients variable in routes/index.js files.

here is my code,

app.js

clients = new cassandra.Client({ contactPoints:[config.contactPoints], keyspace: config.keyspace,authProvider: new cassandra.auth.PlainTextAuthProvider(config.userName, config.password)});

Answer 1

You can define a method in index.js, export it and pass clients as a parameter to the created method.

In index.js

var clients;

exports.assignVal = function(clients){
    this.clients = clients;
};

In app.js

routes = require('./index');
routes.assignVal(clients);

Answer 2

如果希望将此变量分别用于每个请求，则可以使用res.locals ， 否则可以使用app.locals。

Answer 3

You can alter your router files slightly to pass in a parameter. Like so:

var express = require('express')
var router = express.Router()

module.exports = function(your variable) {
  // router.get(...) etc.

  return router
}

Then in app.js , when you require your routers:

var index = require('./routes/index')(your variable)

Obviously, make sure that your variable is defined before requiring your routers.