[Answer]-Printing calculated data in template

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You can add arbitrary data to the instances in the view without needing them to be model fields. This is fine:

for dividend in dividend_list:
    dividend.change = ...calculation...

Just make sure you pass dividend_list to your template context. Are you using class-based views or functional views? For class-based views, do this in get_context_data and add this to the return value. For functional views, put the modified dividend list (no longer a lazy evaluated queryset) into the dictionary argument:

    return render(template_name, {'dividend_list': dividend_list})

Then iterate over it in the template. 

{% for dividend in dividend_list %}
    <tr>
        <td>{{ dividend.date }}</td>
        <td>${{ dividend.amount }} ({{ dividend.change }}%)</td>
        <td>${{ dividend.price }}</td>
    </tr>
{% endfor %}

You could also write a method on the Dividend model to do the calculation and then call it in the template loop, or even write a custom template tag to display the dividend.

Also, you really don’t want to use FloatField to represent money. Use DecimalField instead.

👤Peter DeGlopper

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