目前,Calculated Model Sample app仅计算每个类型的记录的计数。我想计算每个类型的评级的总和。
要简要说明应用的数据模型,每条记录有三个字段:名称(str),类型(str)和评级(num)。< / p>
我已将总和 字段添加到聚合计算模型中,但目前尚不清楚我需要在代码中更改的内容 CalculatedModels 脚本。
以下是计算每个类型的计数的代码块。我已添加records.Sum =
以指示应记录总和的方式和位置。但是,由于现有for循环增加1(计算计数),我是否需要另一个for循环,该循环将增加每个记录的评级的值(因为总和将是每个类型的评分的总和?或者我可以只使用现有的for循环,正如我通过插入指示records.Sum =
我在哪里?
/**
* Gathers statistics of Data records distribution by Type field values.
* Used by the calculated datasource AggregationByType.
* @return {Array<Aggregation>} array of records with the stats by Type.
*/
function getStatisticsByType_() {
var allRecords = app.models.Data.newQuery().run();
var stats = {};
for (var i = 0; i < allRecords.length; i++) {
var recordType = allRecords[i].Type;
if (!stats[recordType]) {
stats[recordType] = 0;
}
stats[recordType]++;
}
var records = [];
var properties = Object.getOwnPropertyNames(stats);
for (var j = 0; j < properties.length; j++) {
var record = app.models.Aggregation.newRecord();
record.Name = properties[j];
record.Count = stats[properties[j]];
record.Sum =
records.push(record);
}
records.sort(sortDataByName_);
return records;
}
答案 0 :(得分:0)
这应该这样做。抱歉,目前没有时间解释。
function getStatisticsByType_() {
var allRecords = app.models.Data.newQuery().run();
var stats = {};
var data = [];
for (var i = 0; i < allRecords.length; i++) {
var recordType = allRecords[i].Type;
var num = allRecords[i].Rating;
if (!stats[recordType]) {
stats[recordType] = {'Count': 0, 'Sum': 0};
}
stats[recordType].Count++;
stats[recordType].Sum += num;
}
var records = [];
var properties = Object.getOwnPropertyNames(stats);
console.log(stats);
for (var j = 0; j < properties.length; j++) {
var record = app.models.Aggregation.newRecord();
record.Name = properties[j];
record.Count = stats[properties[j]].Count;
record.Sum = stats[properties[j]].Sum;
records.push(record);
}
records.sort(sortDataByName_);
return records;
}