For Change the default message:

==== Code example

validates :invoice_number, :presence => {:message => 'The invoice number must be informed.'}

Another shorthand way of assigning key, value pairs:

Hash[one: 1, two: 2] #=> {:one=>1, :two=>2}

Would it be possible to do something like: rescue_from Exception, :with => my_handler, :unless => request.local?

@tordans You asked your question 3 years ago, but in any case, should anyone have that same issue, you can manage that with:

- unless content_for(:footer).blank?
yield(:footer)
- else
== render "layouts/footer_big"

content_for(:x) defaults to an empty string, that's why you need to...

This has been deprecated. See this note on memoize : http://apidock.com/rails/ActiveSupport/Memoizable/memoize#1317-this-has-been-deprecated-replace-with-Memoist

In Rails 3.2, memoize has been deprecated. In edge Rails, it has been removed.

The commit when it was deprecated: http://github.com/rails/rails/commit/36253916b0b788d6ded56669d37c96ed05c92c5c

A Stack Overflow question about this change: http://stackoverflow.com/q/9132197/578288

I personally disag...

See also DateTime#strftime and Date#strftime . (They work similarly, but have different APIdock notes.)

See also Time#strftime and DateTime#strftime . (They work similarly, but have different APIdock notes.)

See also Time#strftime and Date#strftime . (They work similarly, but have different APIdock notes.)

If you want to add additional parameters to the form_for helper, but still want to use one form for both your "create" and your "update" actions, you can add the additional parameters to the :url option, but you need to omit the :controller and :action keys.

form_for(@user, :url => {:param1 =>...

== Array

class Array def included_in? array array.to_set.superset?(self.to_set) end end

[1,2,4].included_in?([1,10,2,34,4]) #=> true

given: order active record class with "state" string field

class Order < ActiveRecord::Base
def state
  @state ||= ActiveSupport::StringInquirer.new(read_attribute(:status))
end
end

order = Order.new(state: "initial")
order.state.initial? #=> true
order.state.paid...

In addition to stevo's note, in Rails 3 you can also do:

model_instance.errors.add(:base, "Msg")

The following date format won't be parsed correctly:

'06/15/2008'.to_date 

Use this instead:

Date.strptime("6/15/2012", '%m/%d/%Y')

e.g.

str = ActiveSupport::StringInquirer.new('test')

str.test? # => true
str.foobar? # => false

Over the weekend I kept running into instances where I was writing code like this:

==== Code example arr = ['hello', 'world']

if arr.length > 2

do stuff

else

do something else

end

So I ended up extending the core and adding an instance method of more_than?

==== Code...

Or you can use this way:

<%= submit_tag "Login", data: { disable_with: "Please wait.." } %>

Since version 3.2.5 you should not use :disable_with.

Use this: <%= submit_tag "Login", 'data-disable-with' => "Please wait.." %>

By just adding a - symbol.

%-I %-d

It's an old problem, reported back in 2010, just reopened issue:

http://github.com/rails/rails/issues/6620