This is one of the main reaons I prefer to write my code in Coffeescript.
You don't have to do the this/that dance thing. You just use the =>
notation to define functions.
On Tuesday, August 13, 2013 1:34:57 AM UTC-7, bodo wrote:
>
> 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> 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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>>>
>>
>>
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