在Django 1.6中使用Python 2.7实现图表 - TypeError:'NoneType'没有属性__getitem__ [英] Implement chartit in Django 1.6 with Python 2.7 - TypeError: 'NoneType' has no attribute __getitem__
问题描述
但是我只收到这个错误信息:
异常值:'NoneType'对象没有属性'__getitem__'
异常位置:/home/administrator/virtualenvs/django27/lib/python2.7/site第128行的load_charts中的packages / chartit / templatetags / chartit.py
此行中出现故障:
hco ['chart'] ['renderTo'] = render_to
错误是否显示,render_to不是dict?
models.py:
类MonthlyWeatherByCity(models.Model):
month = models.IntegerField()
boston_temp = models.DecimalField(max_digits = 5,decimal_places = 1)
houston_temp = models.DecimalField(max_digits = 5,decimal_places = 1)
views.py:
def weather_chart_view请求):
#Step 1:使用我们要检索的数据创建一个DataPool。
weatherdata = \
DataPool(
系列=
[{'options':{
'source':MonthlyWeatherByCity.objects.all()},
'terms':[
'month',
'houston_temp',
'boston_temp']}
])
#Step 2:创建图表对象
cht = Chart(
datasource = weatherdata,
series_options =
[{'options':{
'type':'line',
'stacking':False},
'terms':{
'month':[
'boston_temp',
'houston_temp']
}} ],
chart_options =
{'title':{
'text':'波士顿和休斯顿的天气数据'},
'xAxis': {
'title':{
'text':'月号'}}})
我在模板中添加了脚本文件{{load block}}。
< div ID = '容器' > {{weatherchart | load_charts:container}}< / div>
< script type =text / javascriptsrc =/ static / js / jquery-1.11.0.js>< / script>
< script type =text / javascriptsrc =/ static / js / highcharts.js>< / script>
但这在我看来没有问题。
如何解决?谢谢!
在一段时间浪费之后,我认为解决方案是使您的'视图'返回的字典密钥你在你的模板html文件中有什么。例如,
def weather_view(request):
#其他代码
返回render_to_response(' graph.html',{'weatherchart':cht})
那么你的html模板遵循上面的格式:
< div id ='container'> {{weatherchart | load_charts:container}}< / div>
还要确保在您的...中安装 simplejson
virtualenv使用:
pip install simplejson
I have successfully implemented some apps in Django. At the moment I try to implement a chart according to the tutorial: http://chartit.shutupandship.com/docs/#how-to-use.
But I only receive this error message:
Exception Value: 'NoneType' object has no attribute '__getitem__'
Exception Location: /home/administrator/virtualenvs/django27/lib/python2.7/site-packages/chartit/templatetags/chartit.py in load_charts, line 68
The failure appears in this line: hco['chart']['renderTo'] = render_to
Does the error indicate, that render_to is not a dict?
models.py:
Class MonthlyWeatherByCity(models.Model):
month = models.IntegerField()
boston_temp = models.DecimalField(max_digits=5, decimal_places=1)
houston_temp = models.DecimalField(max_digits=5, decimal_places=1)
views.py:
def weather_chart_view(request):
#Step 1: Create a DataPool with the data we want to retrieve.
weatherdata = \
DataPool(
series=
[{'options': {
'source': MonthlyWeatherByCity.objects.all()},
'terms': [
'month',
'houston_temp',
'boston_temp']}
])
#Step 2: Create the Chart object
cht = Chart(
datasource = weatherdata,
series_options =
[{'options':{
'type': 'line',
'stacking': False},
'terms':{
'month': [
'boston_temp',
'houston_temp']
}}],
chart_options =
{'title': {
'text': 'Weather Data of Boston and Houston'},
'xAxis': {
'title': {
'text': 'Month number'}}})
I included the script files, the {{ load block }} in the templates ..
<div id='container'> {{ weatherchart|load_charts:"container" }} </div>
<script type="text/javascript" src="/static/js/jquery-1.11.0.js"></script>
<script type="text/javascript" src="/static/js/highcharts.js"></script>
but that's in my opinion not the problem.
How can I fix it? Thanks!
After some good time wasted, I think the solution is to make the dictionary key returned by your 'view' matche what you have in your template html file. For instance,
def weather_view(request):
# other codes
return render_to_response('charts/graph.html', {'weatherchart': cht})
then your html template follows format as above:
<div id='container'> {{ weatherchart|load_charts:"container" }} </div>
Also make sure you install simplejson
in your virtualenv using:
pip install simplejson
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