Notes

=== key Name of the cookie for the session === secure If true, session cookie is sent only to https hosts. This protects your app from session hijacking ( remember firesheep? ) === expire_after Self explanatory (e.g. 60.minutes) === domain To which domain the cookie declares to be for

This very go...

Most validators will support all of the following common options: (Through ActiveModel::Errors::CALLBACK_OPTIONS (http://apidock.com/rails/ActiveModel/Errors))

• :if
• :unless
• :allow_blank
• :allow_nil

<%= 
link_to_unless_current("Profile", profile_path) 
%>

also works (instead of pointing to controller/action)

For common attributes in several models, you can set a default human name like this:

==== de.yml

de:
attributes:
  bez: Bezeichnung
  abk: Abkürzung

As the documentation implicitly mentions, when updating nested attributes of a one-to-one relationship, you need to pass the ID of the nested attribute itself, otherwise a new record will be created.

This works fine:

params = { :member => { :avatar_attributes => { :id => '2', :icon => 'sad' }...

Rails 3.0.9 update for RobinWu's post

Available column types:

:string, :text, :integer, :float, :decimal, :datetime, :timestamp, :time, :date, :binary, :boolean

Example:

MyClass < ActiveRecord::Migration

def change
create_table :myclass do |t|
  t.string :name
  t.text :content...

I believe this uses the same parsing format as strftime.

http://apidock.com/ruby/Time/strftime

You aren't mistaken. That is an error in the example with the block above. There's an extra '(' character.

See Ryan Bate's excellent RailsCast #224 about Responders in Rails 3.x: http://asciicasts.com/episodes/224-controllers-in-rails-3

The reason it doesnt work @joshuapinter for IDs is because if you look at the source:

case format
  when :db
    if respond_to?(:empty?) && self.empty?
      "null"
    else
      collect { |element| element.id }.join(",") # look at this line
    end
  else...

If you are passing both :url and :format, url overwrites the use of format, so you'll need to pass it in the url like so:

form_for user, :url => user_path(@user, :format => :json)

If you want to loop through the matches of a regular expression, String#scan is your friend. You can do something like this:

matches = '12345'.scan(/\\d/)
matches.each do |m|
  puts m
end

# => 1
# => 2
# => 3
# => 4
# => 5

for clear a form, use this: <%= f.submit "clear", :type => "reset" %>

A better way to typecast the result array is to use AR's typecasting capabilities. Example:

column = Company.columns_hash['id']
select_values("SELECT id FROM companies LIMIT 3").map do |value|
column.type_cast(value)
end

You can rename the root tag if you don't like what is being generated.

line_item.to_xml(:skip_instruct => true, :root => 'line-item')

require 'action_dispatch/testing/test_process'

Will return strings too when using postgreSQL and gem pg (0.11.0).

in 3.1.0. it works in sqlite3 even, via nested query

but 3.0.3, 3.0.7-9 all broken

+accept+ option should be set to +true+ if you are validating a database column, since the attribute is typecast from "1" to +true+ before validation

validates :terms,
acceptance: {
  allow_nil: false,
  accept: true
}

It is important to note that the block form of this method is unlike any other block form in Rails. You would expect this to work:

<%= f.label :terms_and_conditions do %>
Accept <%= link_to_page 'Terms and Conditions' %>
<% end %>

But doing this ends up messing up the form (I ended up...