I try to pass the variable to another page using GET method in django. It is possible for me to do that, but the problem is that the variable that I passed is not available in the if statement. I try to print out the value then it worked fine. Then I try to use it inside if statement then I come to know that it was not working properly. I have no idea regarding that. Can anyone help me? Thank you very much.
This is my views:
def test(request):
Test = Photos.objects.all()
ID = request.GET['id']
Context = {
'ID' : ID,
'test' : Test,
'testing' : 3,
}
return render(request, 'test.html', Context)
def tests(request):
tests = Photos.objects.all()
Context = {
'tests' : tests,
}
return render(request, 'tests.html', Context)
This is my urls.py:
urlpatterns = [
url(r'^admin/', include(admin.site.urls)),
url(r'^$', 'flashapp.views.home'),
url(r'^play$', 'flashapp.views.play'),
url(r'^test$', 'flashapp.views.test'),
url(r'^tests$', 'flashapp.views.tests'),]
In tests.html I have buttons for passing id to test.html using GET method.
This is tests.html:
</head>
<body>
<h1>Welcome to tests pages.....</h1>
{% for i in tests %}
Click For {{ i.id }}<br>
{% endfor %}
</body>
This is test.html:
<html>
<head>
</head>
<body>
<h1>Welcome to Test Page</h1>
<h1>{{ ID }}</h1>
{% for i in test %}
<p>{{ i.id }}..........{{ testing }}.........{{ ID }}</p>
{% if ID == i.id %}
<p>Test</p>
<p>Working....ID = {{ i.id }}</p>
{% else %}
<p>In else</p>
{% endif %}
{% endfor %}
</body>
this is tests.html
this is test.html
I suppose to see the "Working....." but, it gone to else block. I have no idea. Help me please!!!
Thank you very much.
I edited my original answer based on your comment
You are passing a QuerySet as your Test object instead of an object in the first view, so it doesn't have an id property.
When you do this:
def test(request):
Test = Photos.objects.all()
...
You are getting a collection of all the Photos objects into the Test variable, which is not what you want, you only want one instance of Photos. For that kind of queries, you need to use the .get method, that returns a single instance or an exception in case it doesn't find it.
Test = Photos.objects.get(pk=request.GET['id'])
Your code now should look like this:
def test(request):
ID = request.GET['id']
Test = Photos.objects.get(pk=ID)
Context = {
'ID' : ID,
'test' : Test,
'testing' : 3,
}
return render(request, 'test.html', Context)
Now, for completeness' sake, this would fail in case the ID is not on the database, so we can do something like this:
def test(request):
try:
ID = request.GET['id']
Test = Photos.objects.get(pk=ID)
Context = {
'ID' : ID,
'test' : Test,
'testing' : 3,
}
return render(request, 'test.html', Context)
except Photos.DoesNotExist:
raise Http404("No Photo matches the given query.")
Of course, Django has its own shortcuts for these kind of things, so your code can be written like this:
from django.shortcuts import get_object_or_404
def test(request):
#I strongly suggest you don't use uppercase in variable names
id = request.GET['id']
test = get_object_or_404(pk=id)
context = {
'ID' : id,
'test' : test,
'testing' : 3,
}
return render(request, 'test.html', context)
Related
I'm having problem with Django templates not receiving any data in image.url when having more than one object in context QuerySet all other data is working fine. If there is only one object in QuerySet, image.url works fine. I'm storing images on S3 and there is nothing wrong with the images or the bucket permission.
I'm new with Django templates is there anything I'm missing?
Here is the code:
models.py
`
from django.db import models
from django.core.validators import MaxValueValidator, MinValueValidator
from django.utils.translation import gettext_lazy as _
from site_content.models import PageCategory, Page
from site_content.utils import file_upload_to
class PpcOffersPagesManager(models.Manager):
def get_queryset(self):
return super(PpcOffersPagesManager, self) \
.get_queryset() \
.filter(page_category__category_name="ppc-offer-page")
class PpcOfferPages(Page):
objects = PpcOffersPagesManager()
class Meta:
proxy = True
def __str__(self):
return self.page_name
def save(self, *args, **kwargs):
self.page_category = PageCategory.objects.get(category_name="ppc-offer-page")
self.page_site_type = "ppc"
super(PpcOfferPages, self).save(*args, **kwargs)
class PpcOfferContent(models.Model):
related_page = models.ForeignKey(
Page, verbose_name=_("Page"),
related_name="ppc_offer_content",
on_delete=models.SET_NULL,
null=True
)
order = models.IntegerField(verbose_name=_("Order of offer appearance"), default=0)
image = models.ImageField(
verbose_name=_("Casino banner image"),
upload_to=file_upload_to,
null=True,
blank=True,
help_text="Casino banner image, Size (300x500)"
)
header = models.CharField(
verbose_name=_("Header text"),
max_length=500,
null=False,
blank=False
)
is_active = models.BooleanField(verbose_name=_("Is offer active"), default=True)
class Meta:
verbose_name = _('PPC_Offer Page Content')
verbose_name_plural = _('PPC_Offer Page Content')
def __str__(self):
return self.related_page.page_name
`
views.py
`
from django.views.generic import DetailView
from ppc_site_control.models import PpcOfferContent
class PpcOffersDetailView(DetailView):
model = PpcOfferContent
def get_template_names(self):
page = self.model.objects \
.filter(related_page__slug = self.kwargs['slug']) \
.first().related_page.page_template.template_path
return page
def get_object(self):
return self.model.objects \
.filter(related_page__slug=self.kwargs['slug']) \
.filter(is_active=True) \
.order_by('offer_order')
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
return context
`
.html
`
{% extends "slotsselection/base.html" %}
{% load i18n static reviews sstags %}
{% for offer in object %}
<div>
<div >
<img loading="lazy" src="{{offer.offer_image.url}}" alt="image">
</div>
<div>
<p>{{offer.header}}</p>
<p>{{offer.is_active }}</p>
</div>
<div>
{% endfor %}
`
I tried sending data in the context as new key and adding QuerySet object again with .values()(to exclude possibility of problem with "get_object" query) still have the same result. When I remove the images from template, all other data is displayed accordingly, without images.
I also tried with ListView same error
ValueError The 'image' attribute has no file associated with it.
Data in context:
`{'object': <QuerySet [<PpcOfferContent: PPC PageName>,
<PpcOfferContent: PPC PageName>, <PpcOfferContent: PPC PageName>,
<PpcOfferContent: PPC PageName>]>, 'view':
<ppc_site_control.views.PpcOffersDetailView object at 0x7f2d8230f430>}
`
The problem was caused from missing images because they were not required in the model the simplest solution is adding "if" condition in the template:
`{% if offer.offer_image %}
<img loading="lazy" src="{{offer.image.url}}" alt="Casino image">
{% endif %}`
I also manage to find workaround:
views.py
`from slotsselection.components.s3_settings import MEDIA_URL`
then in the context data I added
`def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['media_url'] = MEDIA_URL
return context
`
.html
and in html I removed .url to get the half of the link as string and added media_url
`<img loading="lazy" src="{{media_url}}{{offer.offer_image}}" alt="Casino image">`
not best approach but it works to.
I need your help, i tried many attempts without success, from my php controller i have following array :
$products = array(
'name' => 'shirt'
array(
'attribues' => array(
array("code" => "1", "label"=>"xs"),
array("code" => "2-", "label"=>"small"),
...
)
)
....
);
In product categories page, where i list all products i have following twig for an product item :
{% for product in products %}
<div>{{ product.name }}</div>
{% endfor %}
Here the aim it to able to filter by products attributes keys so i think something like this, the "product_tab" is a value from a tab where i click :
{% for product in products %}
<div v-if="[{{product.attributes|keys|join(',')}}].includes(selected_code)">{{ product.name }}</div>
{% endfor %}
The tab list :
<div data-tab="1" :click="show_products">xs</div>
<div data-tab="2-" :click="show_products">small</div>
// the vuejs part
const app = {
data() {
selected_code:"1"
},
methods:{
show_products:function(e){
this.selected_code = e.currentTarget.getAttribute("data-tab")
}
}
}
But i get error in console, vuejs as Uncaught SyntaxError: Unexpected token ',' and it brokes the page rendering. I know that the error is because of this line :
v-if="[{{product.attributes|keys|join('"','"')}}].includes(selected_code)"
But i don't know how to make this working, when i dump products.attributes|keys|join like below :
dump(product.attributes|keys|join('"','"'));
it outputs :
"["1-","18-total=0.5","81-"]"
You notice the double quotes around, I'm stumped and I can't find what to do to make this page work.
I don't know why I get this error while trying to reach the admin change_list page of the mymodel model:
NoReverseMatch at /admin/myapp/mymodel/
Reverse for 'myapp_mymodel_change' with arguments '(u'',)' and keyword arguments '{}' not found.
Error during template rendering
In template /usr/local/lib/python2.7/dist-packages/django/contrib/admin/templates/admin/change_list.html, error at line 91
84 <form id="changelist-form" action="" method="post"{% if cl.formset.is_multipart %} enctype="multipart/form-data"{% endif %}>{% csrf_token %}
85 {% if cl.formset %}
86 <div>{{ cl.formset.management_form }}</div>
87 {% endif %}
88
89 {% block result_list %}
90 {% if action_form and actions_on_top and cl.full_result_count %}{% admin_actions %}{% endif %}
91 {% result_list cl %}
92 {% if action_form and actions_on_bottom and cl.full_result_count %}{% admin_actions %}{% endif %}
93 {% endblock %}
94 {% block pagination %}{% pagination cl %}{% endblock %}
95 </form>
The error does not occur on my local runserver(Python 2.7.5, Django 1.5.1), only when deployed on my remote server (Python 2.7.2+, Django 1.5.1). Interestingly enough, only one specific model is affected by this -- I can reach the change_list pages of all the other models without any problems whatsoever. The rest of the admin area works fine as well.
The answers to similar questions regarding the NoReverseMatch error didn't help much because it happens in the admin, not my own code. Does anyone know where to start looking?
EDIT:
I had some customised list_display fields which I now commented out for testing. They seemed to be responsible for the NoReverseMatch error. Now I got another error instead:
AttributeError at /admin/myapp/mymodel/
'NoneType' object has no attribute '_meta'
I then stripped away everything that isn't necessary. This is now my complete admin.py:
from django.contrib import admin
from myproject.myapp.models import *
class MymodelAdmin(admin.ModelAdmin):
list_display = ['email', 'user', 'is_active', 'first_used']
date_hierarchy = 'first_used'
ordering = ['-first_used']
list_filter = ['is_active', 'first_used', 'user']
admin.site.register(Mymodel, MymodelAdmin)
And on my local machine it still works perfectly.
There are some variables which are not getting passed during rendering the template ..
Take your lead by checking the required local variables to be passed as to fulfill the url pattern in url tag ..
I encountered same problem when my foreign key is null while using this script not originally mine on my admin change_list.html.
What it does is to display the column for foreign_key of your model.
from django.forms import MediaDefiningClass
class ModelAdminWithForeignKeyLinksMetaclass(MediaDefiningClass):
def __getattr__(cls, name):
def foreign_key_link(instance, field):
# Please note in Django 1.6
# Model._meta.module_name was renamed to model_name
target = getattr(instance, field)
return u'%s' % (
target._meta.app_label, target._meta.model_name, target.id, unicode(target))
if name[:8] == 'link_to_':
method = partial(foreign_key_link, field=name[8:])
method.__name__ = name[8:]
method.allow_tags = True
setattr(cls, name, method)
return getattr(cls, name)
raise AttributeError
I added a line if target: in filter out those null values.
if target:
return u'%s' % (
target._meta.app_label, target._meta.model_name, target.id, unicode(target))
Script usage:
where carrier,sitename are a foreign key field.
class LatestRsl_v2Admin(admin.ModelAdmin):
__metaclass__ = classmaker(right_metas=(ModelAdminWithForeignKeyLinksMetaclass,))
list_display = ['issued', 'link_to_carrier', ]
search_fields = ['=rslno','=issued','link_to_carrier', 'link_to_sitename']
I made a custom link tag in Liquid and I am trying to be able to pass liquid variables into the call for that tag like so
{{ assign id = 'something' }} // this value is actual dynamic while looping through data
{% link_to article: id, text: 'Click Me!' %} // my custom tag
However this results in the article parameter being passed in as 'id' instead of 'something' as per the assign statement above it.
Does anyone know how to pass variables into tag calls?
I've recently solved this very simply with Jekyll 0.11.2 and Liquid 2.3.0 by passing the name of the variable as the tag parameter.
{% assign v = 'art' %}
{% link_to_article v %}
You can also pass the name of the control var while in a loop, like article above.
In Liquid::Tag.initialize, #markup is the second parameter, the string following the tag name. The assigned variables are available in the top level of the context.
def render(context)
"/#{context[#markup.strip]}/"
end
This obviously only allows one param to be passed. A more complex solution would parse params like x: 2, y: 3.
This solved the case for me context[#markup.strip].
My problem was that i wanted to be able to pass a variable to my custom Liquid tag like this: {% get_menu main_menu navigation.html settings.theme.id %}
In order to do this i first split the variable string into different varaibles on every space character.
class GetMenu < Liquid::Tag
include ApplicationHelper
def initialize(tag_name, variables, tokens)
#variables = variables.split(" ")
#menu_object = #variables[0]
#file_name = #variables[1]
#theme_id = #variables[2]
super
end
def render(context)
# This is where i use context[#theme_id.strip] to get the variable of "settings.theme.id"
content = CodeFile.find_by(hierarchy: 'snippet', name: #file_name.to_s, theme_id: context[#theme_id.strip])
#menu ||= Menu.find_by_slug(#menu_object)
context.merge('menu' => #menu)
Liquid::Template.parse(content.code).render(context)
end
end
Liquid::Template.register_tag('get_menu', GetMenu)
*This is just a more rich example that the answer above by Jonathan Julian
Doesn't look like this is possible, my solution was to just pass the variable name in to the tag and grab it out of the context the tag is being rendered in. Like so:
{% for article in category.articles %}
{% link_to variable: article, text: title %}
{% endfor %}
in my tag code (condensed):
def render(context)
uri = "article/#{context[#options[:variable]]['id']}"
"<a href='#{uri}'>#{build_link_text context}</a>"
end
It would be great to have a tag that can be called with literals and variables like
{% assign v = 'art' %}
{% link_to_article v %}
or
{% link_to_article 'art' %}
or
{% link_to_article "art" %}
and also of course
{% link_to_article include.article %}
In order to so I propose a helper function
def get_value(context, expression)
if (expression[0]=='"' and expression[-1]=='"') or (expression[0]=="'" and expression[-1]=="'")
# it is a literal
return expression[1..-2]
else
# it is a variable
lookup_path = expression.split('.')
result = context
puts lookup_path
lookup_path.each do |variable|
result = result[variable] if result
end
return result
end
end
And in the render just call the helper function to get the value of the literal or variable.
def render(context)
v = get_value(context, #markup.strip)
end
FYI, the initialiser would look like this:
def initialize(tag_name, markup, tokens)
#markup = markup
super
end
This does not strictly answer the question, but it may help others who are new to Liquid (like myself) and try something like this. Instead of implementing a custom tag, consider implementing a custom filter instead. Variables are resolved before they are passed into filters.
Ruby code:
module MyFilters
def link_to_article(input, text)
"<a href='https://example.org/article/#{input}'>#{text}</a>"
end
end
Liquid::Template.register_filter(MyFilters)
Liquid template:
{% assign id = 'something' %}
{{ id | link_to_article: 'Click Me!' }}
Output:
<a href='https://example.org/article/something'>Click Me!</a>
You can also use variables as parameters. So the following would have the same output:
{% assign id = 'something' %}
{% assign text = 'Click Me!' %}
{{ id | link_to_article: text }}
And filters can have zero or more (comma-separated) parameters:
{{ 'input' | filter_with_zero_parameters }}
{{ 'input' | filter_with_two_parameters: 'parameter 1', 'parameter 2' }}
I am attempting to create a profile page that shows the amount of dwarves that are assigned to each corresponding career. I have 4 careers, 2 jobs within each of those careers and of course many dwarves that each have a single job. How can I get a count of the number of dwarves in each of those careers? My solution was to hardcore the career names in the HTML and to make a query for each career but that seems like an excessive amount of queries.
Here's what I "want" to see:
Unassigned: 3
Construction: 2
Farming: 0
Gathering: 1
Here's my models. I add some complexity by not connecting Careers directly to my Dwarves model (they have connected by their jobs).
from django.contrib.auth.models import User
from django.db import models
class Career(models.Model):
name = models.CharField(max_length = 64)
def __unicode__(self):
return self.name
class Job(models.Model):
career = models.ForeignKey(Career)
name = models.CharField(max_length = 64)
career_increment = models.DecimalField(max_digits = 4, decimal_places = 2)
job_increment = models.DecimalField(max_digits = 4, decimal_places = 2)
def __unicode__(self):
return self.name
class Dwarf(models.Model):
job = models.ForeignKey(Job)
user = models.ForeignKey(User)
created = models.DateTimeField(auto_now_add = True)
modified = models.DateTimeField(auto_now = True)
name = models.CharField(max_length = 64)
class Meta:
verbose_name_plural = 'dwarves'
def __unicode__(self):
return self.name
EDIT 1
my view looks something like:
def fortress(request):
careers = Career.objects.annotate(Count('dwarf_set'))
return render_to_response('ragna_base/fortress.html', {'careers': careers})
and template:
{% for career in careers %}
<li>{{ career.dwarf_set__count }}</li>
{% endfor %}
The error is:
Cannot resolve keyword 'dwarf_set' into field. Choices are: id, job, name
SOLUTION
view:
def fortress(request):
careers = Career.objects.all().annotate(dwarfs_in_career = Count('job__dwarf'))
return render_to_response('ragna_base/fortress.html', {'careers': careers})
template:
{% for career in careers reversed %}
<li>{{ career.name }}: {{ career.dwarves_in_career }}</li>
{% endfor %}
EVEN BETTER SOLUTION
careers = Career.objects.filter(Q(job__dwarf__user = 1) | Q(job__dwarf__user__isnull = True)) \
.annotate(dwarves_in_career = Count('job__dwarf'))
Don't forget to from django.db.models import Count, Q
What I like about the above solution was it not only returns careers that have dwarves working but even the careers that have none which was the next problem I encountered. Here's my view for completeness:
<ul>
{% for career in careers %}
<li>{{ career.name }}: {{ career.dwarves_in_career }}</li>
{% endfor %}
</ul>
Django's ORM isn't gonna make this uber-simple. The simple way is to do something like:
for career in Career.objects.all():
career.dwarf_set.all().count()
That will execute 1 query for each job (O(n) complexity).
You could try to speed that up by using Django's Aggregation feature, but I'm not entirely sure if it'll do what you need. You'd have to take a look.
The third option is to use custom SQL, which will absolutely get the job done. You just have to write it, and maintain it as your app grows and changes...
Does this do what you want?
from django.db.models import Count
Career.objects.annotate(Count('dwarf'))
Now each career object should have a dwarf__count property.
Can't you just get a count grouped by career? And do an outer join if you need the zero rows returned too.