Question

I have a JSON store :

{
    "Week": 1145,
    "From": "IN1"
},
{
    "Week": 1145,       
    "From": "IN1"
},
{
    "Week": 1145,        
    "From": "IN2"
},
{
    "Week": 1146,
    "From": "IN1"
},
{
    "Week": 1146,
    "From": "IN2"
} 

I want to count for each “Week”, the number of “From”, for example for Week 1146, i’d get IN1 = 1 and IN2 = 1 and for week 1145 i’d get IN1 = 2 and IN2 = 1.

I’ve written a function that loops through my data store to count IN1 and IN2 for each param:

countBy: function(param){
    var count = {};
    this.each(function(item){
        var type = item.get(param);
        if (Ext.isDefined(count[type])){
            count[type]++;
        } else {
            count[type] = 1;
        }                               
    });
    return count;
}

But the problem is that when I give it “Week” in param, it doesn’t count IN1 and IN2 for each WEEK, it returns “1145” : 3 and 1146 : 2, but what i want is : “1145” : {IN1 : 2} and “1146” : {IN1 : 1}.

Thank you for your help!

Answer 1

You need to pass From as parameter too.

Try below:

countBy: function(param, param2){
    var count = {};
    this.each(function(item){
        var type = item.get(param);
        var from = item.get(param2);
        if (type in count){
            if (from in count[type]) {
              count[type][from]++;
            } else {
              count[type][from] = 1;
            } 
        } else {
            count[type] = {};
            count[type][from] = 1;
        }                               
    });
    return count;
}