Using Redis as Django Cache

2017-04-05 Thread Luvpreet Singh 


I am using(trying) redis as a cache to my django app. This is how I am 
trying to do it.



def postview(request):
post_list = []
if cache.get("posts") == None:
   post_list = Post.objects.all()
   cache.set("posts", post_list, timeout=None)
else : 
   post_list = cache.get("posts")
context = {"post_list" : post_list}
return render(request, 'post_list.html', context)
@cache_page(60*15, key_prefix="test_cache")def new(request):
print("testing")
return HttpResponse("hello, I am mohammed")



This is the output in redis-cli


luvpreet@DHARI-Inspiron-3542:~/test_venv_wrapper/test_redis$ 
redis-cli127.0.0.1:6379> select 2 # I have redis db 2 as backend in django 
settings
OK127.0.0.1:6379[2]> keys *1) 
":1:views.decorators.cache.cache_page.cache_test.GET.26488770af116d67b33750e5f304aa3e.d41d8cd98f00b204e9800998ecf8427e.en-us.UTC"2)
 
":1:views.decorators.cache.cache_header..d314df08d6409ed165873dfa23271c50.en-us.UTC"3)
 ":1:posts"4) 
":1:views.decorators.cache.cache_page..GET.d314df08d6409ed165873dfa23271c50.d41d8cd98f00b204e9800998ecf8427e.en-us.UTC"5)
 
":1:views.decorators.cache.cache_header..26488770af116d67b33750e5f304aa3e.en-us.UTC"6)
 
":1:views.decorators.cache.cache_page..GET.26488770af116d67b33750e5f304aa3e.d41d8cd98f00b204e9800998ecf8427e.en-us.UTC"7)
 
":1:views.decorators.cache.cache_header.cache_test.26488770af116d67b33750e5f304aa3e.en-us.UTC"



This is the value under one of the keys,


 

127.0.0.1> get 
:1:views.decorators.cache.cache_page.cache_test.GET.26488770af116d67b33750e5f304aa3e.d41d8cd98f00b204e9800998ecf8427e.en-us.UTC


"\x80\x02cdjango.http.response\nHttpResponse\nq\x01)\x81q\x02}q\x03(U\x0e_handler_classq\x04NU\b_headersq\x05}q\x06(U\rlast-modifiedU\rLast-ModifiedU\x1dWed,
 05 Apr 2017 10:56:58 GMT\x86U\aexpiresU\aExpiresU\x1dWed, 05 Apr 2017 15:06:58 
GMT\x86U\x0ccontent-typeU\x0cContent-TypeU\x18text/html; 
charset=utf-8\x86U\rcache-controlU\rCache-ControlU\rmax-age=15000\x86uU\b_charsetq\aNU\x11_closable_objectsq\b]U\acookiesq\tcdjango.http.cookie\nSimpleCookie\nq\n)\x81q\x0b}q\x0cbU\x06closedq\r\x89U\n_containerq\x0e]q\x0fU\x14Hello,
 I am Mohammedq\x10aU\x0e_reason_phraseq\x11Nub."

This is some serialized value. 


The queryset Post.objects.all() is cached and I have no problem in getting 
this from cache. But I am failing to understand this @cache_page() 
decorator.


Why is it making so many keys in the redis database ? Please explain the 
keys made in the redis database. How can I get to know this is working or 
not ?

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Serializers and forms

2017-03-16 Thread Luvpreet Singh 
What is the difference in saving model instance to database using a form 
and doing the same by using a serializer ? What is the basic need of 
serializers ?

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Chart library for django

2017-03-05 Thread Luvpreet Singh 





Hi everyone,

I am looking for some solution to display django database queryset to 
django admin over graphs.
I had used highcharts to do that earlier, but to use highcharts, I have to 
write too much scripts and functions.

Is there any kind of inbuilt library that comes with django similar to 
highcharts by which I can display django database queryset in my django 
admin template ?

Like in the picture above.

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Re: USING graphs in django admin

2017-03-03 Thread Luvpreet Singh 
Can we link this with a template and a view in django ?

On Friday, March 3, 2017 at 4:17:08 PM UTC+5:30, Lachlan Musicman wrote:
>
> You could try 
>
> ggplot http://ggplot.yhathq.com/
>
> alternatively there's D3
>
> https://d3js.org/
>
> Cheers
> L.
>
> --
> The most dangerous phrase in the language is, "We've always done it this 
> way."
>
> - Grace Hopper
>
> On 3 March 2017 at 21:22, Luvpreet Singh <s.luvp...@gmail.com 
> > wrote:
>
>> I want to display graphs in django admin. Is there any tool to display 
>> them in django admin site ? 
>>
>>
>> I have tried django-admin-tools-stat , but I don't want to create a 
>> different dashboard for the graphs.
>>
>>
>> I want the queries on the models to be displayed with the help of those 
>> graphs.
>>
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USING graphs in django admin

2017-03-03 Thread Luvpreet Singh 


I want to display graphs in django admin. Is there any tool to display them 
in django admin site ? 


I have tried django-admin-tools-stat , but I don't want to create a 
different dashboard for the graphs.


I want the queries on the models to be displayed with the help of those 
graphs.

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Multiple Databases --- Migrations

2017-02-27 Thread Luvpreet Singh 


I am using 2 postgres databases in my django app.



 'newpostgre': {
   'ENGINE': 'django.db.backends.postgresql_psycopg2',
   'NAME': 'new_postgre2',
   'USER': 'tester',
   'PASSWORD': 'password',
   'HOST': 'localhost',
   'PORT': '',
   },
   

 'newpostgre2': {
  'ENGINE': 'django.db.backends.postgresql_psycopg2',
  'NAME': 'new_postgre3',
  'USER': 'tester',
  'PASSWORD': 'password',
  'HOST': 'localhost',
  'PORT': '',
 },


I have a very simple model

 

 class Check1(models.Model):
  title = models.CharField(max_length=100)


I had run

 

python manage.py migrate --database=newpostgre
python manage.py migrate --database=newpostgre2


when I open my new_postgre2(for newpostgre) database in postgre, I can see 
my Check1 table there.


But in my new_postgre3(for newpostgre2) database in postgre, no Check1 
table is there, only those initial migrations are there.


Why I can't see my table in new_postgre3 when migrations have been 
successfully made? Or is there any rule that model can be migrated to only 
1 database ?

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Re: Multiple Databases

2017-02-27 Thread Luvpreet Singh 
But dylan, I have written that

Check1.objects.using('default').all()

gives me error.

On Mon, Feb 27, 2017 at 1:08 PM, Dylan Reinhold <dreinh...@gmail.com> wrote:

> It is going to use the database named default.
> Checkout the doc on using mutiple DBs
> https://docs.djangoproject.com/en/1.10/topics/db/multi-db/
>
> Dylan
>
>
> On Sun, Feb 26, 2017 at 11:17 PM, Luvpreet Singh <s.luvpree...@gmail.com>
> wrote:
>
>> Hi everyone,
>>
>> I am using 2 databases in my django app. One is default sqlite and second
>> is postgre.
>>
>> Now, I make a simple model named Check1 in my app, having only title
>> attribute.
>>
>> class Check1(models.Model):
>>   title = models.CharField(max_length=100)
>>
>> Now, in my shell,
>>
>> >> from check.models import Check1
>> >> a = Check1(title="first")
>> >> a.save()
>> >> Check1.objects.all()   --> this gives the queryset returning 'first'
>>
>>
>> My question is, in which database is it saved, means in my default db or
>> my postgre db ? or in both ?
>>
>> >> Check1.objects.using('default').all()--> it gives me error
>> >> Check1.objects.using('newpostgre').all()  --> it gives me correct
>> queryset.
>>
>> How does I know or set that in which db it will be saved ?
>>
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Multiple Databases

2017-02-26 Thread Luvpreet Singh 
Hi everyone,

I am using 2 databases in my django app. One is default sqlite and second 
is postgre.

Now, I make a simple model named Check1 in my app, having only title 
attribute.

class Check1(models.Model):
  title = models.CharField(max_length=100)

Now, in my shell,

>> from check.models import Check1
>> a = Check1(title="first")
>> a.save()
>> Check1.objects.all()   --> this gives the queryset returning 'first'


My question is, in which database is it saved, means in my default db or my 
postgre db ? or in both ?

>> Check1.objects.using('default').all()--> it gives me error
>> Check1.objects.using('newpostgre').all()  --> it gives me correct 
queryset.

How does I know or set that in which db it will be saved ?

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Re: A server that runs django

2017-02-22 Thread Luvpreet Singh 
Yeah I am running my django on nginx. I just wanted to make sure that if 
I'm doing wrong by doing so?


On Tuesday, February 7, 2017 at 1:08:01 AM UTC+5:30, Dário Carvalho wrote:
>
> Hi everyone. So, I now understand a little more about how django works and 
> I was thinking about how can I run a site built with django in my own 
> python's server.
> Someone know how can I do such thing? I thought about using asyncio and/or 
> socketserver or even http with socketserver. Anyway, thanks.
>

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Re: Django template language resolve url

2017-02-22 Thread Luvpreet Singh 
Iudovic is right, your syntax is wrong.

use  {% url 'ytlinks:save_ytlinks' %}

the original syntax is ,  {% url 'namespace:url_name' arguments %}
On Thursday, February 16, 2017 at 9:42:14 PM UTC+5:30, xyron wrote:
>
> Code hier eingeben...
>
> Hey there,
>
> I'm searching since more than 12 hours for a solution for my problem and 
> I'm kinda frustrated.
>
> I want to use a form and define the link using django template language in 
> a html-file:
>
> {% extends "base/header.html" %}
> {% block content %}
>
>   
>Enter Youtube-Link
> 
>
> I get following error:
>
> Reverse for 'links.views.save_ytlink' with arguments '()' and keyword 
> arguments '{}' not found. 0 pattern(s) tried: []
>
> My project structure looks like this:
>
> mysite
> +---links
> ¦   +---templates
> ¦   ¦   +---home.html
> ¦   +---urls.py
> ¦   +---views.py 
> +---mainapp
> +---templates
> ¦   +---base
> ¦   ¦   +---header.html
> ¦   +---links
> ¦   +---register
> +---urls.py
> +---views.py
>
>
> mainapp.urls.py looks like this:
>
> urlpatterns = [
> url(r'^', include('links.urls', namespace='ytlinks'), name='index'),
> url(r'^admin/', admin.site.urls),
> url(r'^register', include('register.urls'), name='register'),
> url(r'^ytlinks/', include('links.urls', namespace='ytlinks')),
> ]
>
>
> links.urls.py looks like this:
>
> urlpatterns = [
>url(r'^save_ytlink', views.save_ytlink, name='save_ytlink'),
>url(r'^list$', views.ytlinks_list, name='ytlinks_list'),
>url(r'^', views.ytlinks, name='ytlinks'),
> ]
>
>
> links.views.py looks like this:
>
> def save_ytlink(request):
> msg = ""
> msg_status = "" # possible: 'success', 'info', 'danger', 'warning'
>
>
> # Check if user came here by form
> if request.method == 'GET':
> return render(request, 'home.html')
>
>
> ytlink = request.POST['ytlink']
> allow_save = True
>
>
> # Validation
> # ...
>
>
> return render(request, 'home.html', {'queryset':'', 'msg':msg, 
> 'msg_status':msg_status})
>
>
> Things I tried:
>
> 
> 
> 
> 
> 
>
> (and much more)
>
> I tried to set namespaces, to see if it makes any difference. Also stuff 
> with ../views.save_ytlink didn't work.
>
> Also if I create a file called "test.html" (located in the same 
> directory), it doesn't  change the error.
>
> {% url 'test.html' %}
>
> If I use:
>
> 
>
> It works.
>
> What am I doing wrong? I really, really appreciate any attempt to help.
>
> xyron
>
>
>

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Re: A server that runs django

2017-02-22 Thread Luvpreet Singh 
Well, I completely agree with you. But can we use Nginx servers?


On Tuesday, February 7, 2017 at 1:08:01 AM UTC+5:30, Dário Carvalho wrote:
>
> Hi everyone. So, I now understand a little more about how django works and 
> I was thinking about how can I run a site built with django in my own 
> python's server.
> Someone know how can I do such thing? I thought about using asyncio and/or 
> socketserver or even http with socketserver. Anyway, thanks.
>

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Re: Models/Foreign Keys best practice

2017-02-22 Thread Luvpreet Singh 
Hi Richard,

I am facing a difficulty here.
Can you please tell me that how to iterate over this queryset , 
performance.ensemble_set.all()  ??

Thanks.

On Wednesday, February 22, 2017 at 7:55:24 PM UTC+5:30, Richard Jackson 
wrote:
>
> Hi all,
>
> I'm putting together my first app, closely modelled on the Django 
> tutorial, and wanted some advice regarding when to split the various models 
> into different foreign keys.
>
> The app lists performances, who's performing, what my role is with them 
> (i.e. conductor, pianist etc.), the venue and the start date/time of these 
> performances.
>
> I'd initially thought I should split these all into separate classes, 
> since, for example, the same Ensemble might be involved in a different 
> performance, but I'm now not sure that's correct (/my understanding is 
> incorrect). Would someone mind letting me know if this is a good idea or 
> whether there's a better practice I should follow.
>
> I've included my models.py file below:
>
> from django.db import models
> from django.utils import timezone
> # Create your models here.
>
>
> class Performance(models.Model):
> """First attempt at a thing!"""
> performance_name = models.CharField(max_length=200)
> link = models.CharField(max_length=200)
>
> def __unicode__(self):
> return self.performance_name
>
>
> class Ensemble(models.Model):
> performance = models.ForeignKey(Performance)
> ensemble = models.CharField(max_length=200)
>
> def __unicode__(self):
> return self.ensemble
>
>
> class Role(models.Model):
> performance = models.ForeignKey(Performance)
> role = models.CharField(max_length=200)
>
> def __unicode__(self):
> return self.role
>
>
> class Venue(models.Model):
> performance = models.ForeignKey(Performance)
> venue = models.CharField(max_length=200)
>
> def __unicode__(self):
> return self.venue
>
>
> class Date(models.Model):
> performance = models.ForeignKey(Performance)
> start_date = models.DateTimeField('Start Date', default=timezone.now)
> end_date = models.DateTimeField('End Date', default=timezone.now)
>
>
> Thanks!
>
> Rich
>

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Re: Difference

2017-02-15 Thread Luvpreet Singh 
YES. Thank you very much for explaining this.


On Thursday, February 16, 2017 at 12:20:45 PM UTC+5:30, Michal Petrucha 
wrote:
>
> On Wed, Feb 15, 2017 at 12:48:21PM -0800, Luvpreet Singh wrote: 
> > What is the difference between realted_name and related_query_name ?? 
>
> One is used as the name of the related manager on the remote side, the 
> other is used to traverse the relationship in queryset filters from 
> the remote side. 
>
> Let me try to illustrate that with an example. 
>
>
> class Reporter(models.Model): 
> name = models.TextField() 
>
>
> class Article(models.Model): 
> reporter = models.ForeignKey(Reporter, related_name="articles", 
>  related_query_name="articles_written") 
> title = models.TextField() 
>
>
> So, when you have an instance of the Reporter model, you'd use the 
> related_name, which is “articles” here, to get a list of articles: 
>
> r = Reporter.objects.last() 
> r.articles.all() 
>
> However, if you want to get all reporters, who have written articles 
> with titles beginning with the letter “T”, you'd use the 
> related_query_name in the queryset filter: 
>
> Reporter.objects.filter(articles_written__title__startswith="T") 
>
> Does this make it more clear? 
>
> Cheers, 
>
> Michal 
>

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Difference

2017-02-15 Thread Luvpreet Singh 
What is the difference between realted_name and related_query_name ??

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