When you are working with methods, instead of simple functions, it's highly likely that you can easily run into the common problems where passing a method to another function—such as Q.nfcall—unbinds the method from its owner. Q has to offer its services here too so that you can avoid this, by adopting any of these two ways:
Use
Function.prototype.bind()Use these methods provided by Q:
return Q.ninvoke(redisClient, "get", "user:1:id"); // node invoke return Q.npost(redisClient, "get", ["user:1:id"]); // node post
There is yet another way you can create reusable wrappers, using:
Q.denodeify://using Q.denodeify var readFile = Q.denodeify(FS.readFile); return readFile("foo.txt", "utf-8");Q.nbind:// Q.nbind var redisClientGet = Q.nbind(redisClient.get, redisClient); return redisClientGet("user:1:id");