When you run rake db:rollback and nothing happens, you are probably missing the latest migration file (or have not...
Helix allows you to implement performance-critical code of your Ruby app in Rust, without requiring glue code to bridge...
When dealing with time zones in Rails, there is one key fact to keep in mind: Rails has configurable time...
Expecting a primitive value as an argument to a method invocation is easy: expect(object).to receive(:foo).with('arg1...
When building a form with a file select field, you may want to offer your users a live preview before...
This gem gives you a rake task db:seed:dump do create a db/seeds.rb from your current database state.
You will need to look here and find your own device. Look for the "bootable CD" download, which will give...
When your application crawls twitter profiles for tweets, it might throw HTTP 401 (Unauthorized) errors. Those can happen for a...
Cucumber's docstrings let you add long strings to a step like this: # foo.feature Given this text: """ First line
Instead of using this hack you might want to use MariaDB 10.x which can work with both old and...
OAuth requires a set of params to be carried along requests, among which a nonce. Some libraries pass these along...
Awesome is a very good tiling window manager that provides neat features like automatic layouting of windows, good multi-display...
If you want to access top-level constants inside a BasicObject class, you need to prefix them with ::.
When creating an index using CREATE INDEX, Postgres will create a B-Tree type index by default. The B-Tree...
You can use JavaScript to get or set cookie values on the client. Using the vanilla JavaScript API
Git commands tend to come in groups. Avoid typing git over and over and over by running them in a...
jQuery's deferred objects behave somewhat like standard promises, but not really. One of many subtle differences is that there...
This card existed before, but was outdated due to browser implementation changes. The information below is validated for the current...
While IE9 does support HTML5 tags, it fails to work until you force HTML5 mode. Here are two ways to...
Current webkit browsers like Chrome and Safari have a special variable in their consoles that refers to the selected DOM...
The NestedHash class allows you to read and write hashes of any depth. Examples: hash = {} NestedHash.write hash, 'a', 'b', 'c...
To see all jails: fail2ban status Our $JAIL is usually ssh. To see which IPs are banned currently: fail2ban-client...
You can find out about disk space usage of all tables within your database by running this: SELECT table_name...