Josh on Development

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Getting started with mongodb - dbpath (/data/db) does not exist

I’m working on a project at the moment which requires mongodb. After installing it with

brew install mongo

I got this strange error

Mon Apr 16 13:18:39 [initandlisten] exception in initAndListen: 10296 dbpath (/data/db) does not exist, terminating Mon Apr 16 13:18:39 dbexit: Mon Apr 16 13:18:39 [initandlisten] shutdown: going to close listening sockets... Mon Apr 16 13:18:39 [initandlisten] shutdown: going to flush diaglog... Mon Apr 16 13:18:39 [initandlisten] shutdown: going to close sockets... Mon Apr 16 13:18:39 [initandlisten] shutdown: waiting for fs preallocator... Mon Apr 16 13:18:39 [initandlisten] shutdown: closing all files... Mon Apr 16 13:18:39 [initandlisten] closeAllFiles() finished

Mon Apr 16 13:18:39 [initandlisten] exception in initAndListen: 10296 dbpath (/data/db) does not exist, terminating

Its an easy fix:

$ sudo mkdir -p /data/db/

$ sudo chown `id -u` /data/db

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Time Saving commands

Every now and then you learn a command which make you think WHY DIDN’T I KNOW THIS!

cat id_rsa.pub | ssh user@foobar.com "cat >> ~/.ssh/authorized_keys"

Makes managing servers wayyy easier.

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Order by Last name where name is one field

Just started work on a new project which has a name field opposed to first_name last_name.

If you want to order by the last name you’ll need to do something like this.

@artists.sort! { |a,b| a.title.split(" ")[1].downcase <=> b.title.split(" ")[1].downcase }

Hopefully that’ll work for you. If you have a better way let me know!

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Project Planning - One Size doesn’t fit all

“Plan and wireframe it up, do some user flows and find out if your idea works?”

I had a discussion on twitter about an idea I have for a project, we had a disagreement on how to manage projects. I probably didn’t get my point across, twitters 140 limit is restricting in some ways.

My thoughts on project planning really does vary depending on the project. For client projects we spend a lot of time in the planning stage. It usually looks like this:

  1. Objective
  2. Research
  3. We draw wireframes
  4. We create sketches
  5. We create working prototypes
  6. We test
  7. We Launch
  8. We analyise

Its a simple process thats tried and tested and has served us well for the past few years.

However its rigid in some respects as its client facing, we can’t show sketches on napkins or prototypes than only work if you know the urls. When I work on personal projects they do follow a very similar process but its a lot more organic, my wireframes are on the back of pieces of paper, the plans are written or spoken about, this is how we work and how we can launch little projects really quickly in an afternoon, or from a hack weekend.

My point is not to say that project plans are bullshit, but that “find out if your idea works?” is bullshit, if you want to put the time in to develop a product over a weekend, then its your choice. The validation is already made as soon as you choose to work on it. Validation only needs to happen if the time has an inherent cost which effects something else.

Side projects are so important in how we work as developers / designers / product makers.

2 notes

Lion, RVM and 1.8.7 - 1.8/timeout.rb:60

I’ve just started a new project.. well an old project that uses ruby 1.8.7 and rails 2.3.5.

If you get this error:

1.8/timeout.rb:60: [BUG] Segmentation fault

Its a problem with lion and ruby. Uninstall any version of 1.8.7 you have with

rvm remove 1.8.7

and then run

CC=/usr/bin/gcc-4.2 rvm install ruby-1.8.7 --force

1 note

Creating an empty branch with git

I needed to create an empty branch to just have the html of a project in it.

Heres how todo it:

git symbolic-ref HEAD refs/heads/newbranch 
rm .git/index 
git clean -fdx 
<do work> 
git add your files 
git commit -m 'Initial commit'

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Spork and Rmagick - Segmentation Fault

Its ironic that I spent longer debugging this as to how much time spork actually saves me!

Anyways, if your having issues with Spork and Rmagick its probably down to a dodgy imagemagick installation. I couldn’t figure out what the problem was but theres the solution..

brew remove —force  imagemagick

Then reinstall imagemagick with

brew install -f imagemagick —disable-openmp

Now you will need to uninstall rmagick

gem uninstall rmagick

Go back to your application root and run

bundle install

This resolved my issue, hopefully it should yours too!

http://stackoverflow.com/questions/2838307/why-is-this-rmagick-call-generating-a-segmentation-fault

12 notes

giant robots smashing into other giant robots: Recipe: A/B testing with KISSMetrics and the split gem

thoughtbot:

A/B testing can turn skeptics into believers. Jamie, a designer at 37signals, recently shared a great case study of A/B testing Highrise.

So, what are the mechanics of actually setting up an A/B test in a Rails app?

One approach we’re trying right now on Trajectory is using the split gem…

Filed under a/b testing split testing split gem redis kissmetrics