d3.js条形图没有显示正确的值

Question

所以我创建了一个D3条形图，但我似乎无法弄清楚如何使条形图的值正确显示。它显示最大值为30的所有条形。

我已将错误指向此行：

 d.amenities = amenityNames.map(function (name)
 {
     console.log( +d["sum"]);
     return {name: name, value: +d["sum"]};
 }); 

我似乎错误地指定了值，但我不确定如何纠正这个问题。

我该如何纠正？有一个相同的JSON。任何帮助都会很感激。

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x0 = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var x1 = d3.scale.ordinal();

var y = d3.scale.linear()
    .range([height, 0]);

//todo generate color rang based on the amenities
var color = d3.scale.ordinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00", "#7b6844","#f45000","#f9fc30"]);

var xAxis = d3.svg.axis()
    .scale(x0)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(d3.format(".2s"));

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");


d3.json("StudentInteractionApi", function (error, data) {

    var amenityName = function () {
        var bool = true;
        var unique = [];
        for (var i = 0; i < data.length - 1; i++) {
            for (var x = 0; x < unique.length - 1; x++) {

                if (unique[x] == data[i]['amenity']) {
                    bool = false;
                    break;
                }
                bool = true;
            }
            if (bool == true) {
                unique.push(data[i]['amenity']);
            }
        }
        return unique;
    };

    var amenityNames = amenityName(data);
    console.log(amenityNames);

    data.forEach(function (d) {
        d.amenities = amenityNames.map(function (name)
        {
            console.log( +d["sum"]);
            return {name: name, value: +d["sum"]};
        });
    });

    x0.domain(data.map(function (d) {
        return d.userid;
    }));

    x1.domain(amenityNames).rangeRoundBands([0, x0.rangeBand()]);
    y.domain([0, d3.max(data, function (d) {
        return d3.max(d.amenities,
            function (d) {
                return d.value;
            });
    })]);



    svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);

    svg.append("g")
        .attr("class", "y axis")
        .call(yAxis)
        .append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
        .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text("Population");

    var state = svg.selectAll(".state")
        .data(data)
        .enter().append("g")
        .attr("class", "g")
        .attr("transform", function (d) {
            return "translate(" + x0(d.userid) + ",0)";
        });


    state.selectAll("rect")
        .data(function (d) {
            console.log(d.amenities);
            return d.amenities;
        })
        .enter().append("rect")
        .attr("width", x1.rangeBand())
        .attr("x", function (d) {
            return x1(d.name);
        })
        .attr("y", function (d) {
            return y(d.value);
        })
        .attr("height", function (d) {
            return height - y(d.value);
        })
        .style("fill", function (d) {
            return color(d.name);
        });

});



json sample
    [{"userid":1,"amenity":"time","sum":28},  
     {"userid":1,"amenity":"kiii","sum":33},
    {"userid":1,"amenity":"food","sum":5},
    {"userid":1,"amenity":"taste","sum":32},
    {"userid":1,"amenity":"hmmmm","sum":10},
    {"userid":1,"amenity":"max","sum":19.5}, 
    {"userid":1,"amenity":"youtube","sum":10},
    {"userid":1,"amenity":"f","sum":2.5},
    {"userid":1,"amenity":"smith","sum":2.5},]