Notes

There is a content_for? method in Rails wherewith you can check the content. http://github.com/rails/rails/commit/9cb8c812f2a23ab5653a7888740a014a02c97c18#diff-1

But it's not in the last stable version (2.3.5) http://github.com/rails/rails/blob/v2.3.5/actionpack/lib/action_view/helpers/capture_help...

@ramanavel - The options are dependent on the cache store that you're using. You'll need to have a look at what the cache store you're using allows.

e.g. MemCacheStore allows the use of time criteria based :expires_in, most of the cache stores don't.

http://guides.rubyonrails.org/caching_with_rail...

Using unshift on your load path's for Rails, Sinatra, etc, is a good way of ensuring that the file your including is going to be first.

== Example vendor = File.join(File.dirname(FILE), 'vendor') $LOAD_PATH.unshift File.expand_path(File.join(vendor, 'ultraviolet-0.10.5', 'lib'...

In the case of an odd number of empty spaces in a length, Ruby will append the extra character to the right-hand side of the string.

Example:

irb(main):002:0> "Hello".center(10,"-")
=> "--Hello---"

The description should read:

The argument is the salt string, which must be at least two characters long, each character drawn from [a-zA-Z0-9./].

The reset_column_information method provides a similar function for the model itself. Most useful during migrations.

What are all the options here please?...

The :order parameter is not sanitized, so doing something like Person.find( :first , :order => params[:order] ) could get you in trouble.

You can disable automatically created primary key and add it to manually with mysql:

The migration file:

def self.up

create_table( :my_special_table, :id => false ) do |t|
  t.string :id, :limit => 5, :null => :no
end

execute "ALTER TABLE my_special_table ADD PRIMARY K...

In most *nix system, adding a - after the % will remove preceding 0s.

So %-d for a single digit day, or %-I for a single digit hour, etc.

With the timezone support introduced in Rails 2.1 the idea is that all dates in the database are stored in UTC and all dates in Ruby are in a local timezone.

Time.zone.now == Time.now # => false

as Peter Marklund lights up this in his blog:

http://marklunds.com/articles/one/402

"They will only...

With the timezone support introduced in Rails 2.1 the idea is that all dates in the database are stored in UTC and all dates in Ruby are in a local timezone.

Time.zone.now == Time.now # => false

http://marklunds.com/articles/one/402

Standard action caching ignores query parameters, which means you'd get the same results for a URL with and without query parameters if it was action cached. You can make it pay attention to them by using a custom cache path like so:

caches_action :my_action, :cache_path => Proc.new { |c| c.pa...

When you have two default hash parameters at the end of a function call, you need to use it as the following:

options = { :include_blank => true, :default => @my_object.my_method }

date_select :my_object, :my_method, options, :class => 'my_css_class'

You can try it for yourself on this e...

To get the file name without the extension you can use File.extname in combination with File.basename

File.basename("test.rb", File.extname("test.rb"))             #=> "test"
File.basename("a/b/d/test.rb", File.extname("a/b/d/test.rb")) #=> "test"
File.basename("test", File.extname("tes...

File.dirname provides what File.basename omits.

Instead of using a random number to generate the hostname for the single asset, I prefer using source.hash.modulo, so that a given file is always served from the same host. This makes the content more cacheable by browsers and proxies.

ActionController::Base.asset_host = Proc.new { |source|...

You might not realize it preserves order because it delegates inspect to its super-class, Hash, which doesn't preserve order. But you will see that order is preserved if you iterate or use the keys or values methods:

>> names = ['Amy Irving', 'Jane Doe', 'John Doe', 'John Updike', 'Susan Antho...

Returns an ActiveSupport::OrderedHash, which is a subclass of Hash that preserves order. If you're running Ruby 1.9, it is simply an alias for Hash. Surprisingly, you might not realize that OrderedHash is preserving order since it delegates its inspect method to Hash. More at ActiveSupport::Ordere...

Build hash from elements of your Array using attribute as key and the element as value and return values of Hash:

Hash[*ary.map {|obj| [obj.name, obj]}.flatten].values