Skip to content

Instantly share code, notes, and snippets.

View venkatch789's full-sized avatar

venkatch789

1 follower · 6 following
View GitHub Profile
@venkatch789
venkatch789 / chat.rb
Created March 1, 2014 19:31 — forked from emad-elsaid/chat.rb
require 'sinatra' # gem install sinatra --no-rdoc --no-ri
set :port, 3000
set :environment, :production
html = <<-EOT
<html><head><style>
#text{width:100%; font-size: 15px; padding: 5px; display: block;}
</style></head><body>
<input id="text" placeholder="Write then press Enter."/>
<div id="chat"></div>
@venkatch789
venkatch789 / gist:0af4324d0ec7b6a0fa01
Last active May 31, 2016 23:45
Interviews

@Pramati - HYD (16/07/2015)

  1. What is your role and responsibilities in your current project?
  2. Find common elements from two arrays? Without using any Ruby operator and tell me how would you write a program?
  3. How to find an element from an array? How it internally works?
  4. How to sort ruby objects based on particular object? For ex: [@user1, @user2, @user3, @user4] - Then sort it by user's salary.
  5. Explain MVC?
  6. What is the use of moving controller code to model?
  7. Tell me the internal flow of execution when I call some method? For ex: @object.some_method
@venkatch789
venkatch789 / gist:209de279cc58557aba46
Last active June 21, 2016 19:31
Ruby

Design patterns (in Ruby)

Design patterns are just tools that help us constructing a software.

Template Method pattern

In the Template Method pattern, we create a skeletal class and it is basis for various subclasses or concrete classes. Within in the skeletal class, there are abstract methods, which in turn, will be overridden by the methods of subclasses.

Let's take an example of simple payment system,

@venkatch789
venkatch789 / issues_with_modules.md
Created September 29, 2015 07:28 — forked from ryanb/issues_with_modules.md
Points on how modules can make code difficult to read.

My issues with Modules

In researching topics for RailsCasts I often read code in Rails and other gems. This is a great exercise to do. Not only will you pick up some coding tips, but it can help you better understand what makes code readable.

A common practice to organize code in gems is to divide it into modules. When this is done extensively I find it becomes very difficult to read. Before I explain further, a quick detour on instance_eval.

You can find instance_eval used in many DSLs: from routes to state machines. Here's an example from Thinking Sphinx.

class Article &lt; ActiveRecord::Base
@venkatch789
venkatch789 / gist:7032415b81df16c98bdd
Created September 29, 2015 07:29 — forked from cis-venkat/gist:37c134c434909f88d502
IQs

What are the differences between procs and lambdas?

Before getting into the differences, they are very similar and both are Proc objects.

proc = Proc.new { puts "Hello world" }
lam = lambda { puts "Hello World" }

proc.class # returns 'Proc'
lam.class  # returns 'Proc'
@venkatch789
venkatch789 / gist:3a6f128a4e5907d8c0b1
Created September 29, 2015 07:29 — forked from cis-venkat/gist:956d050971f9a05605ce

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

@venkatch789
venkatch789 / rspec_model_testing_template.rb
Created September 29, 2015 07:30 — forked from cis-venkat/rspec_model_testing_template.rb
# This is a skeleton for testing models including examples of validations, callbacks,
# scopes, instance & class methods, associations, and more.
# Pick and choose what you want, as all models don't NEED to be tested at this depth.
#
# I'm always eager to hear new tips & suggestions as I'm still new to testing,
# so if you have any, please share!
#
# @kyletcarlson
#
# This skeleton also assumes you're using the following gems:
@venkatch789
venkatch789 / sql_views.rake
Created May 27, 2016 10:29 — forked from rietta/sql_views.rake
SQL Views rake task implementing `rake db:views`
namespace :db do
desc "Update and create SQL views"
task :views => :environment do
Dir["#{Rails.root}/db/sql_views/*.sql"].each do |file_name|
STDERR.puts "Applying the SQL view at #{file_name}"
source_file = File.new(file_name, 'r')
if source_file and (sql_content = source_file.read)
ActiveRecord::Base.transaction do
# Each statement ends with a semicolon followed by a newline.
@venkatch789
venkatch789 / Test-Task
Created June 22, 2016 05:45 — forked from grouptable/Test-Task
A task that tests basic Ruby on Rails skills. It requires anywhere between 2-5 hours of your time.
* Create a clean ruby on rails application using twitter bootstrap.
* Create User model with fields first, last, email.
* Install and setup devise gem to use the User model for auth (email used as a user name).
* Generate devise views via rake command
* On the register new user view add a new text field called Secret Code.
@venkatch789
venkatch789 / change_mysql_character_set_and_collation
Created January 30, 2018 07:39 — forked from amuntasim/change_mysql_character_set_and_collation
##Create a migration
### rails g migration make_unicode_friendly
class MakeUnicodeFriendly < ActiveRecord::Migration
def change
alter_database_and_tables_charsets "utf8", "utf8_general_ci"
end
private
def alter_database_and_tables_charsets charset = default_charset, collation = default_collation