Template filter + if tag

Question

I have applied a template filter, which extracts the domain from an email address. In the template file I have this code:

{% for email in user_list %}

<p> 
{{email.email}} corresponds to this domain: 

<b> {{email.email|domain}} </b>
</p>

{% endfor %}

It is currently making bold all domain names. What I want to do is to make bold ONLY those email addresses with a 'valid' email extension (for example, only those at the domain '@gmail.com'). How do I apply an if or ifequal statement to do this?

For example, this is the logic I want it to have --

{% for email in user_list %}

<p> 
{{email.email}} corresponds to this domain: 

    {% if domain = 'specified extension' %}
    <b> {{email.email|domain}} </b>
    {% else %}
    {{ email.email|domain }}
    {% endif %}

</p>

{% endfor %}

Update:

OK -- I got this working by creating a custom model in models.py, like so --

class Table(models.Model):
    name = models.CharField(max_length=50)
    email = models.CharField(max_length=50)
    def valid_email(self):
        verified = ['yahoo.com','gmail.com']
        domain = self.email.split('@')[1]
        return domain in verified

And in the template index.html --

{% for email in user_list %}

<p> 
{{email.email}} corresponds to this domain: 

    {% if email.valid_email %}
    <b>{{ email.email|domain}}</b>
    {% else %}
    {{ email.email|domain}}
    {% endif %}
</p>

{% endfor %}

This works well now, but my concern is that when I need to update the models.py and tamper with the verified email list. Where would be a better place to hold this valid_emails() function, such that I can update it easily? And then how would I reference the function in the template (if different than current)? Thank you.

Answer 1

You can use the with template tag to assign email.email|domain to domain.

<p> 
{{ email.email }} corresponds to this domain: 
  {% with domain=email.email|domain %} 
    {% if domain = 'specified extension' %}
    <b>{{ domain }}</b>
    {% else %}
    {{ domain }}
    {% endif %}
  {% endwith %}
</p>

Note that I've used the Django 1.3 with syntax. See the docs for earlier versions of Django.

To follow up on Ben James' comment, if you set a list of specified_extensions in the view, you can use in operator in your if statement.

In the view:

specified_extensions = ['gmail.com', 'hotmail.com',]

In the template:

{% if domain in specified_extensions %}
...

Update:

I think that you have put the valid_emails method in the correct place, it belongs on the model. If you want to be able to update the list of domains without restarting the server, I suggest you store the domains in the database.

class VerifiedDomain(models.Model):
    name = models.CharField(max_length=50, help_text="an allowed domain name for emails, e.g 'gmail.com'")

class Table(models.Model):
    name = models.CharField(max_length=50)
    email = models.CharField(max_length=50)
    def valid_email(self):
        domain = self.email.split('@')[1]
        return VerifiedDomain.objects.filter(name=domain).exists()