CODEWITHSUNDEEP
pythondjango
user1427661
user1427661

Reputation: 11774

Broken if Evaluation in Templates

I have a conditional within a Django template that will create text a certain color if the expression evaluates true and another color if not. Note that I'm not actually going to have my styles in the HTML like in this example, but this makes it easier to give an example. Here's the code: 

    <div class="span6 resultsBox">
        <h2>Items:  
            {% if user.items >= user.itemsQuota %}
            <span id="items" style="color:green">{{ user.items}} </span>
            {% else %}
            <span id="items" style="color:white">{{ user.items }} </span>
            {% endif %} 
            / {{user.itemsQuota }}.
        </h2><br />
    </div>

No matter what I do, the resulting span text is green! Normally I'd think there's something wrong with my models and how they are calculating equality, but even when the out put is something like 100/1000, where clearly {{ user.items }} is less than {{ user.itemsQuota }}, the green font occurs! What am I missing here with my conditionals?

Upvotes: 0

Views: 64

Answers (1)

robertklep
robertklep

Reputation: 203304

My guess would be user.items is a string and user.itemsQuota is a number. In Python (before 3.x), '100' > 1000 is True.

Quick demo: 

from django.template import Template, Context
from django.conf import settings

settings.configure()

t = Template('{% if a > b %} a > b {% else %} a <= b {% endif %}')
print t.render(Context({ 'a' : '100', 'b' : 1000 }))
print t.render(Context({ 'a' : 100  , 'b' : 1000 }))

prints:

a > b 
a <= b

If you want a template-only solution, this works:

t = Template('{% if a|add:"0" > b|add:"0" %} a > b {% else %} a <= b {% endif %}')

(because add coerces the values to integers)

Upvotes: 3

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