User not Defined in Models.py Function

Question

How do I turn this into a function that can be called from a template?

>>> var1 = coremodels.Recommendation.objects.get(title="test5")
>>> user = User.objects.get(username='admin') // should get self.request.user
>>> var1.vote.exists(user)

Current Attempt:

I currently have it in models.py but getting error global name 'user' not defined:

class Recommendation(models.Model):
    user = models.ForeignKey(User)
    def check_user_voted(self):
        user_voted = self.votes.exists(user)
        return user_voted

This is the html request:

{% if recommendation.check_user_voted %}
    <p>User Voted</p>
{% endif %}

@Gocht sure: pastebin.com/QqJqZv8E Though i think this should be in views.py (just unsure how to create the function) — Onichan
– Onichan, Commented Jun 30, 2015 at 22:58

Jorick Spitzen · Accepted Answer · 2015-06-30 23:02:10Z

2

As long as your function doesn't need parameters, it can be called from templates: https://docs.djangoproject.com/en/1.8/topics/templates/#variables

In your check_user_voted function, user is not defined. It should be:

def check_user_voted(self):
    user_voted = self.votes.exists(self.user)
    return user_voted

answered Jun 30, 2015 at 23:02

Jorick Spitzen

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Comments

Gocht · Accepted Answer · 2015-06-30 23:02:27Z

0

To call a function from template, you need to use the decorator @property

class Recommendation(models.Model):
    ...

    @property
    def check_user_voted(self):
        ....
        return something

Then you call it from a Recommendation object: reco_object.check_user_voted

Finally, to reference the user associated to the current recommendation object, you need to use self.user which will return the User object once the recommendation object has one associated.

def check_user_voted(self):
    user_voted = self.votes.exists(self.user)
    return user_voted

answered Jun 30, 2015 at 23:02

Gocht

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4 Comments

Jorick Spitzen Over a year ago

It doesn't have to be a property to call it from a template. It will just be called without parameters: docs.djangoproject.com/en/1.8/topics/templates/#variables

Jorick Spitzen Over a year ago

In fact, using the @property tag suggests it is a very 'lightweight' function, and because this is a database call, isn't that lightweight. This is not a rule, just a convention.

Gocht Over a year ago

That example is about sending data from views, I talk about call a function in template.

Jorick Spitzen Over a year ago

"If a variable resolves to a callable, the template system will call it with no arguments and use its result instead of the callable."

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