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Jesse Waites jessewaites

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@flavorjones
flavorjones / README.md
Created May 8, 2009 14:00

Parallelize Your RSpec Suite

We all have multi-core machine these days, but most rspec suites still run in one sequential stream. Let's parallelize it!

The big hurdle here is managing multiple test databases. When multiple specs are running simultaneously, they each need to have exclusive access to the database, so that one spec's setup doesn't clobber the records of another spec's setup. We could create and manage multiple test database within our RDBMS. But I'd prefer something a little more ... ephemeral, that won't hang around after we're done, or require any manual management.

Enter SQLite's in-memory database, which is a full SQLite instance, created entirely within the invoking process's own memory footprint.

(Note #1: the gist for this blog is at http://gist.github.com/108780)

@zhengjia
zhengjia / capybara cheat sheet
Created June 7, 2010 01:35
capybara cheat sheet
=Navigating=
visit('/projects')
visit(post_comments_path(post))
=Clicking links and buttons=
click_link('id-of-link')
click_link('Link Text')
click_button('Save')
click('Link Text') # Click either a link or a button
click('Button Value')
@adamjmurray
adamjmurray / Inline SVG on Rails.md
Created July 4, 2010 20:34
SVG on Rails

I wanted to use inline SVG in a rails app. Two steps were needed to enable this:

  1. Set content type to application/xhtml+xml. I enabled this globally by adding this to application_controller.rb

     before_filter{ response.content_type = 'application/xhtml+xml' }

  2. Indicate we're using XHTML in the <html> tag. I enabled this globally in application.html.erb:

@byplayer
byplayer / rspec_cheat_sheet.rd
Created May 11, 2011 03:16
rspec cheat sheet
INSTALL
=======
$ gem install rspec
RSPEC-RAILS
===========
RAILS-3
=======
@jondkinney
jondkinney / setup_textmate_rails_dev.md
Created June 16, 2011 08:16
Setup Textmate for Rails Dev on OS X

##Setup Textmate for Rails Dev on OS X

This guide was written by Jon Kinney for the Green Bay Ruby User Group. Jon works at Intridea and they graciously sponsor the Green Bay RUG meetings.

These guides were also partially completed using time from Intridea's SparkTime initiative which aims to give employees "outside projects" to work on during their normal work week.

If you find any issues with these suggestions please let me know. I've amassed these tips/tricks over several years of full time Rails development using Textmate but just because it works on my system doesn't always mean it will be problem free universally. Thanks to all the blog authors whose articles helped me learn Textmate over the years but whose links/posts I've lost or forgotten over time. If you have a cool Textmate tip or trick please post it in the comments!

@runemadsen
runemadsen / description.markdown
Created September 26, 2011 15:23
Reverse polymorphic associations in Rails

Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

@rstacruz
rstacruz / index.md
Last active November 3, 2023 09:56
Rails models cheatsheet

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

@roberto
roberto / _flash_messages.html.erb
Created August 13, 2012 22:47
Rails flash messages using Twitter Bootstrap
<% flash.each do |type, message| %>
<div class="alert <%= bootstrap_class_for(type) %> fade in">
<button class="close" data-dismiss="alert">×</button>
<%= message %>
</div>
<% end %>
@aspyct
aspyct / sort.rb
Last active October 29, 2023 03:08
Ruby implementation of quicksort, mergesort and binary search
# Sample implementation of quicksort and mergesort in ruby
# Both algorithm sort in O(n * lg(n)) time
# Quicksort works inplace, where mergesort works in a new array
def quicksort(array, from=0, to=nil)
if to == nil
# Sort the whole array, by default
to = array.count - 1
end
@cpjolicoeur
cpjolicoeur / gist:3590737
Created September 1, 2012 23:15
Ordering a query result set by an arbitrary list in PostgreSQL

I'm hunting for the best solution on how to handle keeping large sets of DB records "sorted" in a performant manner.

Problem Description

Most of us have work on projects at some point where we have needed to have ordered lists of objects. Whether it be a to-do list sorted by priority, or a list of documents that a user can sort in whatever order they want.

A traditional approach for this on a Rails project is to use something like the acts_as_list gem, or something similar. These systems typically add some sort of "postion" or "sort order" column to each record, which is then used when querying out the records in a traditional order by position SQL query.

This approach seems to work fine for smaller datasets, but can be hard to manage on large data sets with hundreds (or thousands) of records needing to be sorted. Changing the sort position of even a single object will require updating every single record in the database that is in the same sort group. This requires potentially thousands of wri