python - “NoneType”对象在 Chartit 中不可迭代

Question

因此，我尝试用我的数据创建一个数据透视图，但我一直收到“NoneType”对象不可迭代。我正在使用图表。我的错误特别针对“条款”:['tot_ft']}]) 这是特别在数据透视图部分

这是我的代码:以下是我导入的以下内容:

from django.shortcuts import render, get_list_or_404, get_object_or_404, redirect
from django.contrib.auth.decorators import login_required
from basketball.models import Stats, Player, League, Game, Team
from django.contrib.auth import get_user
from django.db.models import Sum
from django.http import HttpResponse, HttpResponseRedirect
from django.core.mail import send_mail, BadHeaderError
from chartit import PivotDataPool, PivotChart

View .py

def player_pivot_chart_view(request):
# Step 1: Create a PivotDataPool with the data we want to retrieve 
playerPivotData = PivotDataPool(
        series = 
        [{'options': {
            'source': Stats.objects.all(),
            'categories': 'player__first_name'},
        'terms': {
                'tot_ft':Sum('freeThrowsMade')}}])
pivcht = PivotChart(
            datasource = playerPivotData,
            series_options = [
                {'options': {
                    'type': 'column',
                    'stacking': True},
                'terms': ['tot_ft']}])
return render(request,'basketball/StatsPage.html', {'dataChart':pivcht})

模型.py

class Stats(models.Model):
    player = models.ForeignKey(Player)
    game = models.ForeignKey(Game)
    freeThrowsMade = models.PositiveIntegerField(verbose_name='FTm', default = 0)
    freeThrowsAttempted = models.PositiveIntegerField(verbose_name='FTa', default = 0)
    twoPointsMade = models.PositiveIntegerField(verbose_name='2Pm', default = 0)
    twoPointsAttempted = models.PositiveIntegerField(verbose_name='2Pa', default = 0)
    threePointsMade = models.PositiveIntegerField(verbose_name='3Pm', default = 0)
    threePointsAttempted = models.PositiveIntegerField(verbose_name='3Pa', default = 0)
    blocks = models.PositiveIntegerField(default = 0)
    steals = models.PositiveIntegerField(default = 0)
    assists = models.PositiveIntegerField(default = 0)
    fouls= models.PositiveIntegerField(default = 0)

Answer 1

我遇到了同样的错误。在 chartit 源代码中稍微搜索后，我找到了解决方案。

除了 data_source 和 series_options 之外，您还可以为 PivotChart 构造函数提供一个可选参数:chart_options。当未给出 chart_options 时，chartit 默认将 None 分配给它，从而导致您遇到的错误。这实际上是 chartit 中的一个错误。

要绕过这个，你应该发送一个空字典作为chart_options:

pivcht = PivotChart(
            datasource = playerPivotData,
            series_options = [
                {'options': {
                    'type': 'column',
                    'stacking': True},
                'terms': ['tot_ft']}],
            chart_options = {})