subject:"Template variables"

Template Variables

2020-03-31 Thread aetar

I am writing a simple web app, and I am struggling to access my variable 
attributes in one of my templates. The get_object_or_404 method returns my 
customized 404 error from my *content_detail.html *file: "No content is 
available." 

Here are my files:

*archive/archive/urls.py:*

from django.contrib import admin
from django.urls import include, path
from django.views.generic import RedirectView
from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
path('posts/', include('posts.urls')),
path('admin/', admin.site.urls),
path('', RedirectView.as_view(url='posts/', permanent=True)),] + 
static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)

*archive/posts/urls.py:*

from django.urls import path

from . import views

app_name = 'posts'

urlpatterns = [
path('', views.index, name='index'),
path('/', views.ContentDetailView.as_view(), 
name='content-detail'),
]

*archive/posts/models.py:*

import datetime

from django.db import models
from django.utils import timezone
import uuid

class Content(models.Model):
content_head = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

class Meta:
verbose_name_plural='contents'

def __str__(self):
return self.content_head

def get_absolute_url(self):
return reverse('detail', args=[str(self.id)])

class ContentInstance(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, 
editable=False)
content = models.ForeignKey(Content, on_delete=models.SET_NULL, 
null=True)
content_body = models.TextField()

def __str__(self):
return f'{self.id}, {self.content.pub_date}'

*archive/posts/views.py:*

from django.shortcuts import render, get_object_or_404

from .models import Content, ContentInstance
from django.views import generic

def index(request):
archive_list = Content.objects.order_by('-pub_date')[:5]
context = {'archive_list': archive_list}
return render(request, 'posts/index.html', context)

class ContentDetailView(generic.DetailView):
model = Content

def content_detail_view(request, primary_key):
content = get_object_or_404(Content, pk=primary_key)
return render(request, 'posts/detail.html', context={'content':content})

*archive/posts/templates/posts/index.html:*




  Title


  Heading
 {% if archive_list %}
 
  {% for content in archive_list %}
{{ content.content_head 
}}({{ content.pub_date }})
  {% endfor %}
  
  {% else %}
  No content is available.
  {% endif %}



*archive/posts/templates/posts/content_detail.html:*




  Title


  Heading
 
 {% if content %}
   {% for contentinstance in content.contentinstance_set.all %}
{{ content.pub_date }}
   {{content.content_body}}
   {% endfor %}
 {% else %}
 No content is available 
 {% endif %}
 



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Re: Template variables not showing up in web-page

2015-10-24 Thread CTA2052

Thank you for the very speedy reply. I really apprceciate that.  Actually I 
had tried the page/file name in place of the path as well and it still 
would not work. What it turned out to be is, on the back end of a reboot 
(because I took a break to up the memory on my macbook pro,) I rebooted and 
it then worked. Not sure why a reboot fixed it, but it did, just in case 
anyone else has the same problem in the future, that is what worked for me.
Thanks all!
CTA

On Friday, October 23, 2015 at 3:51:57 PM UTC-4, CTA2052 wrote:
>
> Hello All,
>
> This may be the most basic question to ask and believe me it does not come 
> without much research and frustration, but I just can't seem to make it 
> work. So I do apologize ahead of time for even having to post it. I am very 
> new to django (2-months), python(4-months) and in fact programming in 
> general. I have reviewed the online doc sevral times now and various books 
> and tutorials trying to find the answer.
>
> However, I can't seem to get my template variables to render within the 
> web page (crazy I know).
>
> I've tried this many different ways and finally backed-up and 
> stripped-down the code to see what it is I'm missing
>
> *Here is what I have right now in the veiw:*
>
> def response_page(request):
>   
> myv = " fun fun fun "
> context = {'affirmation': myv}
> return render('/response_page/', context )
>
>
> *Here is the template:*
>
>
> 
>
> {% extends "base.html" %}
> {% load static %}
> {% load crispy_forms_tags %}
>
> 
> 
> 
> challenge_engine_response
> 
> 
> {% block content %}
> Testing 1,2,3
>
>
>  I am having so much {{ affirmation }}   
>
> Back to Home Page
>
> 
> {% endblock %}
> 
>
>
> Everything shows up as expected except the variable "affirmation"  which 
> of course should render as "fun fun fun".
>
> I am sure I am missing something silly, but what?
> Thanks in advance for the help.  I have very little hair left at this 
> point (ha).
>
> Thank you all!
>
> Humbly yours,
> CTA2052
>

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Re: Template variables not showing up in web-page

2015-10-23 Thread Dheerendra Rathor

signature for request is render(request, template_name, context, **kwargs)

So it should be like render(request, 'response_page.html', context=context)

On Sat, 24 Oct 2015 at 01:21 CTA2052  wrote:

> Hello All,
>
> This may be the most basic question to ask and believe me it does not come
> without much research and frustration, but I just can't seem to make it
> work. So I do apologize ahead of time for even having to post it. I am very
> new to django (2-months), python(4-months) and in fact programming in
> general. I have reviewed the online doc sevral times now and various books
> and tutorials trying to find the answer.
>
> However, I can't seem to get my template variables to render within the
> web page (crazy I know).
>
> I've tried this many different ways and finally backed-up and
> stripped-down the code to see what it is I'm missing
>
> *Here is what I have right now in the veiw:*
>
> def response_page(request):
>
> myv = " fun fun fun "
> context = {'affirmation': myv}
> return render('/response_page/', context )
>
>
> *Here is the template:*
>
>
> 
>
> {% extends "base.html" %}
> {% load static %}
> {% load crispy_forms_tags %}
>
> 
> 
> 
> challenge_engine_response
> 
> 
> {% block content %}
> Testing 1,2,3
>
>
>  I am having so much {{ affirmation }}   
>
> Back to Home Page
>
> 
> {% endblock %}
> 
>
>
> Everything shows up as expected except the variable "affirmation"  which
> of course should render as "fun fun fun".
>
> I am sure I am missing something silly, but what?
> Thanks in advance for the help.  I have very little hair left at this
> point (ha).
>
> Thank you all!
>
> Humbly yours,
> CTA2052
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-users+unsubscr...@googlegroups.com.
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> Visit this group at http://groups.google.com/group/django-users.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/django-users/5f78b5c5-0652-479f-9ffc-8cd2604967b8%40googlegroups.com
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> .
> For more options, visit https://groups.google.com/d/optout.
>

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Template variables not showing up in web-page

2015-10-23 Thread CTA2052

Hello All,

This may be the most basic question to ask and believe me it does not come 
without much research and frustration, but I just can't seem to make it 
work. So I do apologize ahead of time for even having to post it. I am very 
new to django (2-months), python(4-months) and in fact programming in 
general. I have reviewed the online doc sevral times now and various books 
and tutorials trying to find the answer.

However, I can't seem to get my template variables to render within the web 
page (crazy I know).

I've tried this many different ways and finally backed-up and stripped-down 
the code to see what it is I'm missing

*Here is what I have right now in the veiw:*

def response_page(request):
  
myv = " fun fun fun "
context = {'affirmation': myv}
return render('/response_page/', context )


*Here is the template:*




{% extends "base.html" %}
{% load static %}
{% load crispy_forms_tags %}




challenge_engine_response


{% block content %}
Testing 1,2,3


 I am having so much {{ affirmation }}   

Back to Home Page


{% endblock %}



Everything shows up as expected except the variable "affirmation"  which of 
course should render as "fun fun fun".

I am sure I am missing something silly, but what?
Thanks in advance for the help.  I have very little hair left at this point 
(ha).

Thank you all!

Humbly yours,
CTA2052

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Re: Should I use 'locals()' or create a dictionary with the template variables? What is better?

2014-07-17 Thread Russell Keith-Magee

On Fri, Jul 18, 2014 at 4:45 AM, Neto wrote:

> Using 'locals ()' would slow page loading? What is better?
>

Using locals() as template context might give you a *slight* slowdown in
template rendering (since you'll have lots of context variables that you
won't be using). However, that effect would be negligible.

There's a much better reason that you shouldn't use locals() as a template
context - it can lead to unexpected side effects and hard-to-debug problems.

If you use locals() as a template context, *every* variable in your local
context - including ones that you've included for counting or other
temporary storage - are used as part of your template rendering. So - lets
say you develop a template that checks {% if foo %}. Intially; your view
doesn't assign anything to foo, so the block doesn't execute. But then, six
months later, you start using a temporary variable foo in your view - all
of a sudden, the template will start rendering the block. You haven't
changed anything in your template - you're just using a temporary variable
that you weren't using before. You didn't *intend* to make a change to your
template; the rendering of the template has changed as result of something
unrelated to the template design.

The Zen of Python says "explicit is better than implicit"; this is a
perfect example of just that. If you're explicit about what you want to
render, and what you pass to a context, this sort of bug will never happen.

Yours,
Russ Magee %-)

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