Django/Chartit NameError: global name 'MonthlyWeatherByCity' is not defined

StackOverflow https://stackoverflow.com/questions/23378843

  •  12-07-2023
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Question

I am trying to product plots in my Django site using Chartit. I am following the official tutorial, but getting the following error as I try to navigate to my page. 

NameError at /chart/ <br>
global name 'MonthlyWeatherByCity' is not defined

I would appreciate any tips that might solve this issue. I am using the demo database from Chartit, I have run python manage.py syncdb before I started the server.

models.py looks like: 

from django.db import models

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)

view.py looks like: 

from chartit import DataPool,Chart
from django.template import RequestContext
from django.template import Context,loader
from django.shortcuts import render_to_response
from django.http import HttpResponse

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'}}})

    #Step 3: Send the chart object to the template.
    return render_to_response({'weatherchart': cht})

chart.html in template looks like: 

<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="/static/js/jquery.min.js"></script>
    <script type="text/javascript" src="/static/js/highcharts.js"></script>
    {% load chartit %}
    {{ weatherchart|load_charts:"container" }}

  </head>
  <body>
    <div id="container" style="width:100%; height:400px;"></div>
  </body>
</html>
Was it helpful?

Solution

You haven't imported your model. At the top of your views.py add:

from .models import MonthlyWeatherByCity
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