I am trying to create a dashboard where I can analyse my model's data (Article) using the library [plotly](https://plot.ly/python/).

The Plotly bar chart is not showing on my template, I am wondering if I am doing something wrong since there's no error with the code below :

**models.py**

```
from django.db import models
from django.contrib.auth.models import User
import plotly.plotly as py
import plotly.graph_objs as go

class Article(models.Model):
    user = models.ForeignKey(User, default='1')
    titre = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=40)
    likes = models.ManyToManyField(User, related_name="likes")

    def __str__(self):
        return self.titre

    @property
    def article_chart(self):
        data = [
            go.Bar(
                x=[self.titre], #title of the article
                y=[self.likes.count()] #number of likes on an article
            )
        ]
        plot_url = py.plot(data, filename='basic-bar')

        return plot_url

```

**dashboard.html**

```
<div>{{ article.article_chart }}</div>

```

Why is the bar chart not visible? Any suggestion ?