`this.collection` doesn't yet exist, so the `else` path in `saveData` is
being taken, which is sent to `connectDB` which calls
`MongoClient.connect`, but does not bind `this` to the callback.
This change should work:
this.connectDB(this.saveData.bind(this));
On Mon, Aug 12, 2013 at 7:22 PM, bodo <vuducbinhs...@gmail.com> wrote:
> I did a pretty code:
>
> var Square = function(id,order,color,state) {
>
> this.id = id;
> this.order = order;
> this.color = color;
> this.state = state;
> this.connected = false;
>
> MongoClient.connect(config.mongoURL, (function(err, db) {
> this.connected = true;
> this.db = db; //db
> this.collection = db.collection("squares"); //collection
> }).bind(this));
> }
>
> Square.prototype.connectDB = function(callback){
>
> (function(that){
> MongoClient.connect(config.mongoURL, function(err, db) {
> console.log("connected");
> this.connected = true;
> this.db = db; //db
> this.collection = db.collection("squares"); //collection
>
> //callback(that);
> callback();
>
> });
>
> })(this);
> }
>
>
> Square.prototype.test = function(){
> console.log("test");
> }
>
> //export data
> Square.prototype.exportData = function(){
>
> var rtArr = {
> id:this.id,
> order:this.order,
> color:this.color,
> state:this.state
> };
>
> return rtArr;
> }
>
> //save datas to mongo
> Square.prototype.saveData = function () {
>
> if (this.collection){
>
> *var doc = this.exportData();*
> this.collection.insert(doc,function() {
> console.log('inserted');
> });
> }else{
> this.connectDB(this.saveData);
> }
> }
>
> var square = new Square(6,1,'red',1);
> square.saveData();
>
> When I run this code, that display:
>
> throw err
> ^
> TypeError: Object #<Object> has no method 'exportData'
>
> Why it can not understand *var doc = this.exportData(); ?*
> *
> *
> Someone can help me ? Thank you very much
>
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