Django template == condition on string doesn't work - django

Question

I want to display in an email template some conditional informations but even if the {{ error }} confirms the value of my error is list index out of range , the condition is not applied and else is taken in account.
I send to my (email) template this:
views.py
try:
[...]
except Exception as e:
error_product_import_alert(
{'order_increment_id': order_increment_id, 'product': item['sku'],
'error': e, 'request': request})
error_product_import_alert()
def error_product_import_alert(context):
product = context['product']
order_id = context['order_increment_id']
error = context['error']
sujet = f' Anomalie : Import SKU {product} ({order_id}) impossible
({error})!'
contenu = render_to_string('gsm2/alerts/product_import_ko.html', context)
[...]
email template
<p>--{{ error }}--</p>
{% if error == 'list index out of range' %}
<p><strong>Le produit est introuvable dans la base.</strong></p>
{% else %}
<p><strong>Erreur inconnue : veuillez contacter l'administrateur.</strong></p>
{% endif %}
Maybe my error is so big that I even can't see it.
Is there one ?

Answer 1

You are comparing an Exception to a string. This would not work in templates. Try doing the logic in your python function itself and return the error string that will be rendered in the template.
For example:
You should try:
views.py
try:
[...]
except Exception as e:
error = "Erreur inconnue : veuillez contacter l'administrateur."
if e.args[0] == 'list index out of range':
error = "Le produit est introuvable dans la base."
error_product_import_alert({
'order_increment_id': order_increment_id,
'product': item['sku'],
'error': error,
'request': request
})
template
<p><strong>{{error}}</strong></p>