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Daniel Song danielmsong

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danielmsong / web_perf.md
Created July 22, 2013 18:51 — forked from ndelage/web_perf.md

Web Preformance

Sources of slow

Database

  • n+1 queries (try :includes or join)
  • Complex joins (is there another way to find the data?)
  • Missing indexes
  • Useless indexes
  • Schema (prossibly denormalize)
@danielmsong
danielmsong / scrum.md
Created June 29, 2013 05:35

Agile Software Development

Agile is a general philosophy describing a set of guiding principles for building software through iterative development. Agile development is about providing a framework that allows developers to build something useful for real world users and deal with the realities of interruptions, timelines, and technical requirements that disrupt an ideal development cycle. In other words, Agile development helps developers deal with reality.

SCRUM is a methodology -- in another words, an implementation -- pertaining specifically to project management. Other "Agile" methodologies inclue extreme programming, kanban.

SCRUM history:

Scrum was a term first used in 1987 to describe hyper-productive product development in Japan. The word Scrum comes from rugby, where scrum refers to the strategy used for getting an out-of-play ball back into play. The name Scrum stuck because of the similarities between the game of rugby and the type of product development prosc

@danielmsong
danielmsong / rspec_overview.md
Created June 29, 2013 05:34

Definitions

General Testing

  • TDD Test Driven Development. Write examples before implementation.
  • BDD Behaviour-Driven Development is about implementing an application by describing its behavior from the perspective of its stakeholders. (The Rspec Book)
  • RSpec (mention alternatives, write a simple hand sewn test)

Testing Terms

@danielmsong
danielmsong / web_security.md
Created June 29, 2013 05:34

Web Security

This post outlines three common web security vulnerabilities with specific examples in Rails. For a more complete list, I highly recommend the OWASP Rails security cheatsheet.

Cross-Site Scripting (XSS)

A cross-site scripting attack is when malicious scripts are injected into a web site in order to compromise it.

For example, let's say we want to allow html tags such as <strong> in our blog comments, so we render raw output using the Rails method #html_safe:




  


  




    


          
    

      

        
        

          

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                danielmsong
                / heroku_export.md
            
            

              Created
              June 29, 2013 04:50
                — forked from blurredbits/heroku_export.md
            

          

        

      

        

  

      

    
Importing/Exporting a Postgres DB from Heroku


In the following scenario, we have the following apps on the Heroku server:


    

  • Staging Server: staging-stackoverfluff
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  • Production Server: stackoverfluff
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In addition, each developer has a local development environment.


The goal is to move production data over to the staging server, and also provide production data to each of the developers. Here's what we will do.



  


  




    


          
    

      

        
        

          

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                danielmsong
                / index.html
            
            

              Last active
              December 18, 2015 11:09
                — forked from dbc-challenges/index.html
            

              
                DBC Phase 2 Practice Assessment Part 3
              
          

        

      

        

  

    
    


        



  


  

        

          
          <!doctype html>
        

        

          
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            <head>
        

        

          
              <link rel="stylesheet" href="http://cdn.jsdelivr.net/normalize/2.1.0/normalize.css">
        

        

          
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              <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700,800">
        

        

          
              <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Lato:100,900">
        

        

          
              <link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/font-awesome/3.0.2/css/font-awesome.min.css">
        

        

          
            </head>