Notes

The given example seems to be broken. The +:mime_type+ option as well as the [] access on the Mime::Type class are both not working.

The following code allows the custom setting of content types as intended by the original example:

class  PostsController < ActionController::Base
d...

If you use the mem_cache_store it will use "memcache-client" to talk to the actual cache. memcache-client is a pure Ruby library that is bundled with rails. There is a Ruby/C library called "memcached" that uses native bindings to talk to memcache, and it is reportedly (http://blog.evanweaver.com/...

If you simply say Dir.tmpdir you might get a nice surprise:

irb> Dir.tmpdir NoMethodError: undefined method `tmpdir' for Dir:Class from (irb):1

Strangely, this method seems to be stored in a file that Ruby doesn't require by default. Just require 'tmpdir' and all should be wel...

What, you were expecting documentation? :)

An excellent survey of how FormBuilders work is here:

http://code.alexreisner.com/articles/form-builders-in-rails.html

Let's say you want to multiply all values of the following hash by 2:

hash = { :a => 1, :b => 2, :c => 3 }

You can't use map to do so:

hash.map {|k, v| v*2 }   # => [6, 2, 4]

However, with merge you can:

hash.merge(hash) {|k,v| v*2 }   => {:c=>6, :a=>2, :b=>4}

(The above is Ruby 1....

Please note that if the condition is false, link_to_if will still output the name given as a plain text (as documented above). If you want nothing printed at all, you'll have to stay with the old and trusty:

link_to "Login", ... if @current_user.nil?

Please note that if the condition is false, link_to_if will still output the name given as a plain text (as documented above). If you want nothing printed at all, you'll have to stay with the old and trusty:

link_to "Login", ... if @current_user.nil?

The opposite of this is #blank?

The opposite of this is #present?

Of course, this has to be done in a transaction, like so:

# we've loaded user earlier and did some checks which took some time
# to make sure, updates made meanwhile by other threads don't lead to
# optimistic locking errors here, we do this when finally suspending
User.transaction...

ActiveRecord::Callbacks

First of all, drogus idea really helped me. I'm not using jQuery, therefore I implemented my own version:

=== link_to_function

def add_object_link(name, where, render_options)
html = render(render_options)

link_to_function name, %{
  Element.insert('#{where}', #{html.to_json...

With the addition of ActiveRecord::Dirty, the update statement will only feature changed columns, as opposed to the comment of railsmonk below.

See glob for more usage information and comments.

Say you want to scan for files in directory +base_dir+ and you want to use the relative path from this base dir, you could do it like this:

base_dir = '/path/to/dir'
files = Dir[File.join(base_dir, '**', '*.yml')]

# files now contain absolute paths:
files.first # => "/path/to/dir/f...

Extend REXML::Element so that it can get the first text and following inner texts (child texts included) of the current element as array and as string:

class REXML::Element

def inner_texts

REXML::XPath.match(self,'.//text()') end

def inner_text

REXML::XPath.match(self,'.//t...

It's perfectly normal to receive 'X' strings with Ruby's UDP sockets before the actual content.

Consider the following example:

require 'socket'

PORT = 5500

socket = UDPSocket.new
socket.bind('', PORT)

for i in 1..10
IO.select([socket])
p socket.recvfrom_nonblock(409...

I am not sure I get your "method 1" alec-c4; won't that define the method each time the before_filter is called? Why not just define the method in the controller?

You can pass parameters or call protected methods with instance_eval:

before_filter :only => :show do |controller|
controller.i...

"Kyle", "Дети", "Niños", "Quan-lu", "た ち"

validates_format_of :first_name, :with => /^([^\\d\\W]|[-])*$/

In addition to comment below, you can make a column with default value so in your forms it will be enabled by default and behave correctly with validation errors unlike :checked => true

==== in your migration

add_column :accounts, :ssl_enabled, :boolean, :default => 1