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Karthik Ravindra karthikbgl

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karthikbgl /
Last active August 29, 2015 14:04
Django ModelAdmin "Save as New"
class MyModelAdminForm(forms.ModelForm):
To add the option 'Save as New', by default does not work for reverse
ManyToMany/ForeignKey fields. In other words, does not copy over the
reverse attributes. A simple workaround to make this happen is:
update the cleaned_data and returning it in the context.
Something like this:
def clean(self, *args, **kwargs):
cd = self.cleaned_data
karthikbgl /
Last active August 29, 2015 14:06
Sunsigns models and create view using django
CAPRICORN = 'Capricorn'
AQUARIUS = 'Aquarius'
PISCES = 'Pisces'
ARIES = 'Aries'
TAURUS = 'Taurus'
GEMINI = 'Gemini'
CANCER = 'Cancer'
LEO = 'Leo'
karthikbgl /
Last active August 29, 2015 14:06
Editing south migrations to run custom sql
# -*- coding: utf-8 -*-
import datetime
from south.db import db
from south.v2 import DataMigration
from django.db import models
class Migration(DataMigration):
def forwards(self, orm):
karthikbgl /
Last active August 29, 2015 14:07
Usage of partials
This is an example of functools.partials
Typical usage is when you have a function that needs multiple parameters,
of which one is a constant, you can use a partial.
Return only the values in an iterable which match the regex 'c.t' where . is a single character.
['cat', 'cut', 'abc', 'def']
karthikbgl / seconds_to_string
Created October 23, 2014 15:36
Time elapsed in seconds
def secondsToStr(t):
This snippet converts the time elapsed in
seconds to HH:MM:SS.mmm
>>> secondsToStr(123456)
karthikbgl /
Created June 25, 2015 01:00
Override the standard 500 error page to display the stack trace if certain conditions are met. The advantage of overriding the server error handler is, it keeps everything else intact - example all the error emails, etc.
from django.views.debug import technical_500_response
from django.views.defaults import server_error
def server_error_handler(request):
ip_address = request.META.get("HTTP_X_FORWARDED_FOR", request.META.get("REMOTE_ADDR"))
if ip_address in settings.ALLOWED_IPS_FOR_DEBUG_SCREEN: #or request.user.is_staff
return technical_500_response(request, *sys.exc_info())
return server_error(request)
karthikbgl / console_log_ie_fix.js
Last active August 29, 2015 14:25
console.log messages in code are bad for Internet Explorer <= 9. This plugin would avoid the application from crashing when console.log messages are present in the javascript code.
;(function () {
// console.log statements cause issues in Internet Explorer <= 9.
// This piece of code prevents the application to fail
// Source for console:
var fns = [
karthikbgl /
Created October 24, 2015 04:44
Find smallest multiple
import fractions
def smallest_multiple( n):
return reduce(lambda x, y: x*y/fractions.gcd(x, y), range(2, n+1))
karthikbgl /
Created October 24, 2015 04:46
All possible combinations of substrings
import itertools
def yieldSubset(s):
return sorted(list(set([''.join(c) for i in range(len(s)+1) for c in itertools.combinations(s, i) if c])))
karthikbgl / regex_matcher.js
Last active July 22, 2017 14:04
Regex pattern matches using jquery
(function($) {
$.fn.regexFinder = function(text) {
Phone number formats
var cc_re = /(?:4[0-9]{12}(?:[0-9]{3})?|[25][1-7][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})/g;
var date_re = /\d{2}\/\d{4}/g;