Arext
=====

Active Record Extensions.

=== Validations 
== validates_constraints
This uses the information one can extract from ActiveRecord::ConnectionAdapter::Column 
to add default validations. The text?, limit and type methods are used to guess what validations are to be added
validates_constraints make some assumptions (see below) and none of its behaviour is configurable.
(you can always use the standard validations in addition to make some adjustments)

 * Adds validates_presence_of for columns with not null constraints (unless type is :boolean)
   * options are added so that empty strings will pass, unlike if you add the validate_presence_of yourself.
     If you want to have different behaviour then just add a validation yourself
 * Adds validates_inclusion_of(:in => [true, false]) for columns with not null constraints and :boolean type
 * Adds validates_length_of for text columns with not null limit

== validates_url
This validator adds the feature to validate urls with http and https protocols. It also include 
portnumbers and any subdomains. Instead of a domain name, you can use ip address too (version 4).

== validates_host
This validator adds the feature to validate a hostname. Instead of a hostname, you can 
use ip address too (version 4).

== validates_email
This validator adds the feature to validate a email address.


Example
=======
== validates_constraints
in your ActiveRecord class:
 validate_constraints(:attribute_name, :other_attribute_name)
or
 validates_constraints() for all attributes

== validates_url
in your ActiveRecord class:
  validates_url(:attribute)

== validates_host
in your ActiveRecord class:
  validates_host(:attribute)

== validates_email
in your ActiveRecord class:
  validates_email(:attribute)



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