You can use gem list to list all gems available from a remote gem server: gem list -r --clear-sources -s 'https://user:password@gemserver.tld/' This is useful to debug cases...
...where Bundler complains of a gem existing in more than one gem source...
You may omit the /path/to/link_name to have a link with the same filename appear in the current directory
It's that simple to allow one of your Linux users to run a single command as UID 0: sudo visudo Add the line below to allow user 'deploy' to...
There is a bug in Rails 3's dbconsole script, which makes the following command open a database console for the development environment: rails dbconsole -p test
...that you want to provide default views for a group of controllers. Let’s say you have a bunch of controllers inside the Admin namespace and you would like each...
...action for Admin::PostsController and “app/views/admin/posts/index.html.*” is not available, it should then render “app/views/admin/defaults/index.html”. Since Rails 3.0, we have a new abstraction called resolvers that holds the logic to find...
This will reduce the filesize of foo and bar to 0 bytes: truncate -s0 foo bar If the files do not exist they will be created. You can use this...
...to easily truncate your application's log files: truncate -s0 log/*.log
...have to write an HTML message for some weird reason. Here is how: Hold the Shift-Key while clicking on "Write", "Reply", "Reply All", or "Forward".
E. g. in the following example, Array could mean either Foo::Array or simply Array: class Foo def list Array.new end end What Ruby does here is to see...
...if the name Array makes sense inside of Foo::, and if that fails, resolves it to ::Array (without a namespace). The bad This is relevant for old Ruby versions. Ruby...
...the following way: if object is a block, it converts the block into a simple proc. if object is a Proc, it converts the object into a block while preserving...
...the lambda? status of the object. if object is not a Proc, it first calls #to_proc on the object and then converts it into a block...
Let's say you have a folder images and want to to move all files in there to a new subfolder public. cd images mkdir public mv !(public) public
...public) excludes the new subfolder itself from being moved...
...its columns, you can use the following CSS property: table-layout: fixed It is supported by every browser ever...
When running migrations with rake db:migrate, there's the STEP and VERSION parameters that you can pass to nearly all commands. # Migrate rake db:migrate rake db:migrate STEP...
...rake db:migrate VERSION=20080906120000 # Redo rake db:migrate:redo rake db:migrate:redo STEP=2 rake db:migrate:redo VERSION=20080906120000 # Rollback (starting from latest migration) rake db:rollback...
With Rails 4, Concerns have become the “official” solution to the big-models problem. However, there’s a fair amount of controversy about this topic in the community. Not everyone...
...is convinced that Concerns are the “right“ solution to the problem of AR models becoming too big. In this talk we will see what Rails Concerns are and how can...
When you put a Rake task into lib/tasks, but running it fails with... Don't know how to build task...
The linked article has a great explanation how to to deal with string encodings in Ruby. Furthermore you can check out some of our cards about encoding: Ruby's default...
...encodings can be unexpected How to fix invalid byte sequence in UTF-8 error
...or overflow directives in your CSS. Remove and tags in proximity of your table (seriously...
...multiply a BigDecimal with another BigDecimal, the result will be a new BigDecimal with sufficient precision to represent the result. No rounding or clipping should occur in that operation.
...means you just transitioned back into the land of random rounding errors. Don't screw up your clean BigDecimal values by thoughtlessly multiplying them with a Float. For instance, this...
not or and if unless while until begin/end For more information see Table 18.4 in The Pragmatic Programmer's Guide...
Safari & Chrome Use $x() in your console: $x('//span') # selects all span elements Firefox There's an add-on...
If your Snom 300 always keeps the same volume for headset and ringtone (as soon as you change one you also change the other), here's what to do:
...to your phone settings web interface, then Preferences (German Präferenzen). There is the seemingly harmless setting for Ringer Device from Headset (German Klingeltonausgabe bei Kopfhörer). Choose one: "Headset" or "Speaker...
Since I'm a software architect and a web developer, I get often approached by people with their new ideas. In most cases, for some quality feedback, and on lucky...
...rough quote about the costs of such a project. These people are usually very secretive about what they have, making me explain to them that it's far from my...
Pour color on your Rails console with awesome_print. Turn confusing long strings into formatted output. Have objects and classes laid out clearly whenever you need it. Put gem 'awesome...
...ap that will give you a colored, formatted output of whatever you pass it. See the example output of the User class below. For customization visit the repository on Github...
url = 'http://www.foocorp.com/foo/bar' URI.parse(url).host # => www.foocorp.com Note that this will raise an error if the given argument is...
...base revision from which both conflicting versions are derived You can also use a similar pane view to compare to files. Mark two files and press Ctrl + D to compare...