teohm

PLEASE NOTE: We'd prefer you send your answers to workwithus@rrsoft.co rather than post them publicly in another Gist or in comments on this Gist ;-)

1. Voting

Each voter can vote in zero or more referenda. Each referendum has one or more questions, and each question is a yes/no vote. Write the simplest normalized schema to describe this in generic SQL statements or as an entity-relationship diagram. Point out where the indexes would be if you want to quickly know the results of a given referendum question, but you never expect to query a single voter's voting record.

2. Availability on AWS

Your client plans to host their web application on AWS. When would you advise (a) deployment in a single availability zone, (b) deployment in multiple availability zones in a single region (c) deployment in multiple regions? What operational difficulty or complexity, if any, is added as you go from (a) to (b) to (c)?

teohm

# based on the following:
# http://saintgimp.org/2013/01/22/merging-two-git-repositories-into-one-repository-without-losing-file-history/
# http://blog.caplin.com/2013/09/18/merging-two-git-repositories/

git clone repo_main
git clone repo_sub
cd repo_main

git remote add repo_sub ../repo_sub
git fetch repo_sub

teohm

This is an example of how I combine interaction/service classes with Wisper event broadcasting in Rails.

In this example, I show a UsersController#create API, a corresponding service object, and all the test code/listeners to make it all happen.

The outcome is:

• Concepts in your system ("Signing up a user", "Creating an order") have a single entry point in your codebase, vs. making stupid raw ActiveRecord calls to object.save in dozens of places.
• Since your concept has one entry point (the service class), you can easily grep for usage of it.
• Stupid easy to attach listeners to the service class
• All event listeners are very small and easily unit tested

teohm

<snippet>
  <content><![CDATA[
Upgrade rails from ${1:old_version} to ${2:new_version}.

- Updated: [rails](http://github.com/rails/rails), [${1:old_version}...${2:new_version}](https://github.com/rails/rails/compare/v${1:old_version}...v${2:new_version})
- Updated: actionmailer, ${1:old_version}...${2:new_version} ([CHANGELOG](https://github.com/rails/rails/blob/v${2:new_version}/actionmailer/CHANGELOG.md))
- Updated: actionpack, ${1:old_version}...${2:new_version} ([CHANGELOG](https://github.com/rails/rails/blob/v${2:new_version}/actionpack/CHANGELOG.md))
- Updated: actionview, ${1:old_version}...${2:new_version} ([CHANGELOG](https://github.com/rails/rails/blob/v${2:new_version}/actionview/CHANGELOG.md))
- Updated: activejob, ${1:old_version}...${2:new_version} ([CHANGELOG](https://github.com/rails/rails/blob/v${2:new_version}/activejob/CHANGELOG.md))
- Updated: activemodel, ${1:old_version}...${2:new_version} ([CHANGELOG](https://github.com/rails/rails/blob/v${2:new_version}/activemodel/CHANGELOG.md))

teohm

import java.util.*;
import java.lang.*;
import java.io.*;
import java.security.*;
import java.math.*;

class MD5Example
{
  public static void main (String[] args) throws java.lang.Exception
  {

teohm

BEGIN {

  require 'net/http'
  
  Net::HTTP.module_eval do
    alias_method '__initialize__', 'initialize'
    
    def initialize(*args,&block)
      __initialize__(*args, &block)

teohm

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

teohm

require 'date'

# 1) this doesn't work, why?
format = "%-m/%-d/%Y %-l:%M:%S %p"
d = DateTime.new(2014,6,5,1,5,9)
d == DateTime.strptime(d.strftime(format), format) # raised ArgumentError: invalid date

# 2) this works, why?
format = "%-m/%-d/%Y %-l:%M:%S %p"
format2 = "%m/%d/%Y %l:%M:%S %p"

teohm

[Solved] Failed to build ruby 2.x with readline 6.3

Error

readline.c:1977:26: error: ‘Function’ undeclared (first use in this function)
     rl_pre_input_hook = (Function *)readline_pre_input_hook;

Read more

teohm

rake local_gem:init
rake local_gem:update_projects

cd project_dir
begin
  abort if git_staging_dirty?
  bundle_update(gem_name)
  abort unless lockfile_modified?
  git_add(gem_name)
  git_commit(MSG_GEM_UPDATED, gem_name)