Thank you guy
On Tuesday, August 13, 2013 2:46:55 AM UTC+2, Rick Waldron wrote:
>
> `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 <vuducb...@gmail.com
> <javascript:>>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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