dc.js箱形图-TypeError：data.map（...）。sort不是函数

Question

我正在尝试从具有16个值（并非全部都是数字）的对象的单个交叉过滤器维度中创建一个包含4个框的框图。我希望这些值来自A，C，C2和G。出于某种原因，我收到一条错误消息，说data.map.sort不是一个函数：

示例对象：

A: 6.666666666666665
AN: 18
C: 9.999999999999998
CN: 28
C2: 10
C2N: 21
G: 2.0000000000000013
GN: 19
N/A: NaN
analyze_url: "some string"
collection_mode: "default"
collector_id: "some irrelevant number"
custom_value: ""
custom_variables: {}
date_created: "2019-09-15T12:06:47+00:00"
date_modified: "2019-09-15T12:16:50+00:00"

创建箱形图：

dimension = createDimension(ndx);
    let columns = ['G', 'C', 'C2', 'A']

    function createBoxPlot() {
        const boxPlot = new dc.BoxPlot(divRef);
        let group = dimension.group().reduce(
            function reduceAdd(p, v) {
                columns.forEach(function(c) {
                    // keep array sorted for efficiency
                    p[c].splice(d3.bisectLeft(p[c], v[c]), 0, v[c] || 0);
                });
                return p || 0;
            },
            function reduceRemove(p, v) {
                columns.forEach(function(c) {
                    p[c].splice(d3.bisectLeft(p[c], v[c]), 1);
                });
                return p || 0;
            },
            function reduceInitial() {
                let p = {};
                columns.forEach(function(c) {
                    p[c] = [];
                });
                return p || 0;
            });
        boxPlot
            .dimension(dimension)
            .margins({top: 10, right: 50, bottom: 30, left: 50})
            .group(group)
            .valueAccessor(function (p) {
                console.log(p);
                return p || 0;
            })
            // .elasticY(true)
            // .elasticX(true)
            .width(700)
            .height(500);
        return boxPlot;
    }

    return createBoxPlot();
}

我收到以下错误：

TypeError: data.map(...).sort is not a function
SVGGElement.<anonymous>
node_modules/dc/dist/dc.js:4674
  4671 | // For each small multiple…
  4672 | function box (g) {
  4673 |     g.each(function (data, index) {
> 4674 |         data = data.map(value).sort(d3Array.ascending);
  4675 |         const _g = d3Selection.select(this);
  4676 |         const n = data.length;
  4677 |         let min;