I’ve spent all day trying to get Devise and nested attributes to play nicely together. This and giving the user the ability to update parts of their profile without providing a password proved kind of tricky. Here’s how I got things working.
This is a beginner level tutorial on how to set up authentication (verifying who you are) and authorization (what you are permitted to do) using Ruby 2.2, Rails 4.2 and two popular Ruby gems: Devise and cancancan.
Last year I wrote about installing rbenv on Linux Mint 16. Back then the installation process as described on the project’s Github page didn’t work for me and, after much frustration, I ended up installing an older version of rbenv from the repositories.
Recently, I had to reinstall my operating system (upgrading to Mint 17.1) and decided to give the rbenv installation process another try. I’m happy to say that it worked entirely as expected and within a matter of minutes I had two Ruby versions installed on my system and could switch between them at will.
Rails is database agnostic, meaning that it can talk to different databases without more than configuration changes. Here’s how to install PostgreSQL on Linux Mint 16 and configure it for use with Rails.
This might be necessary in order to update the contents of a drop down menu, or to check the availability of a user name, all without reloading the whole page.
Using AJAX isn’t very hard and in this tutorial I’ll show you how to get up and running.
I wrote a simple Ruby script to parse text files and manipulate their content.
This is useful, for example, if you want to replace all occurrences of the phrase “Dr Jones” with “Prof. Jones” across a set of HTML files.
This was working great on Windows, but when I ran it under Linux, I started getting a “invalid byte sequence in UTF-8″ error. This is how I solved it.
I was working on a form for a timekeeping app, where a user is able to enter their time worked, as well as breaks taken.
There is no limit on the amount of breaks that may be taken, but one of the validation requirements is that no two breaks may overlap.
Here’s how I implemented this validation check.
A little jQuery trick I learned recently, was how to create a reusable, custom filter to target specific elements based on their characteristics.
I was kind of surprised that I hadn’t heard of this before, so thought I’d jot it down here, in case it is of use to anyone else.
This morning I had to give a client an estimate for some work they wanted doing on a Rails 2.1.2 app.
The work itself wasn’t overly complicated, but getting a system up and running using Ruby 1.8 and Rails 2.1 proved to be somewhat of a challenge.
Here’s how I did it.
I see quite a few questions on how to persist state (of a checkbox, for example) between page reloads, so decided to write a tutorial on how this might be achieved.
In the tutorial I show how to make a simple style switcher, not because the world needs another style switcher, but rather to demonstrate this technique using a half-way to realistic example. I also took the opportunity to show how to attach event handlers unobtrusively (without jQuery) and manipulate an element’s style.