Prathamesh Sonpatki - Prathamesh Sonpatki (Page 3)

Weirdness of Bigdecimal.new

Recently i was bitten by this weirdness of BigDecimal in Ruby. BigDecimal.new excepts initial value and number of significant digits. In one of my app, BigDecimal.new was called with string initial value without precision. Everything was working great and suddenly something changed. And this error started coming. can't

emacs

Setting up ispell and Emacs on Mac OS X

I was trying to setup flyspell mode on new Mac and whenever i do flyspell-buffer but Emacs was throwing error - Problem - Flyspell does not work with Emacs. Can't find ispell. Mac OS X does not come with ispell or its replacement aspell. So the first thing is to

rails

Devise : Passing params to after_* paths

Devise allows us to customize after_signup_path by overriding a protectedmethod in RegistrationsController. class RegistrationsController < Devise::RegistrationsController protected def after_inactive_sign_up_path_for(resource) your_custom_path end def after_sign_up_path_for(resource) your_custom_path end end If we are using :confirmable with

rails

VERP on Rails

We sent newsletter campaigns from our Rails app. One of the main requirement of such campaign is how many emails bounced?. We need to track all bounced emails and map them again to a specific campaign because there will be multiple campaigns going on all the time. To track bounced

jquery

jQuery append and clone

I was trying to append some part of the DOM to some other element of the page. <div id='container'> <ul class='contacts_list'> </ul> </div> ... <div id='updated_contacts'> </div> On a click event, i wanted to

ruby

Enable minitest again

If you have skipped minitest/test-unit while creating a rails app with -T or want to move to minitest from rspec or want to start with minitest in an existing rails project without tests, its very easy. Just include require "rails/test_unit/railtie" in config/application.rb. After this

Facebook app with multiple subdomains

I had a requirement of adding facebook integration with our Rails app. I am using omniauth-facebook gem for the authentication part and it works great. Our app has multiple subdomains for all clients, so i wanted to callback URLs separate for each client. For example, For foo.example.com, callback

rails

Preload associations with `find_by_sql`

I have a very complex query which is made up of more than 1 subqueries. Arel is awesome, but it can’t generate that query. So i generate those subqueries separately and combine them by union or intersection based on some condition. Finally the generated query is given to find_

rails

Conditional where in rails

T.L.D.RYou can pass blank object to where clause and it will return current relation as it is. Long versionSometimes, we need to apply where clause conditionally. For eg. apply timeframe condition if timeframe is given in params. We can achieve this using simple if/unless. def most_

jenkins on fedora with rails

Installing jenkins on Fedora is quite easy. $ sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo $ sudo rpm --import http://pkg.jenkins-ci.org/redhat/jenkins-ci.org.key $ sudo yum install jenkins $ sudo service jenkins start/stop/restart Start jenkins by $ sudo service jenkins

sicp

SICP Exercise 1-11

Problem -A function f is defined by the rule that f(n) = n if n < 3 and f(n) = f(n-1) + 2 * f(n-2) + 3 * f(n-3) if n >= 3. Write a procedure that computes f by means of a recursive process. Write a procedure that computes f

sicp

SICP Exercise 1-6 : Understanding order of evaluation

SICP Exercise 1.6 is very interesting. I found it difficult to understand the problem and then the solution. It was fun to actually understand and reason about the solution. In section 1.1.7 we define a function to calculate square root of a number by Newton’s method

sicp

SICP Exercise 1-3

Define a procedure that takes three numbers as arguments and returns the sum of squares of the two larger numbersI broke this problem into 3 steps Define a square function which will take one argument and return its square. (define (square x) (* x x)) ; (square 6) 36 Define a sum-of-squares