Validate attributes plugin with ruby on rails
validate_attributes is a really simple plugin to validate specific attributes of a model unlike the method valid? which collectively validates all the attributes. This plugin provides the functionality of validating specific attribute(s) and skipping others’ validations and vice versa.
Installation : svn://vinsol.com/plugins/sur/validate_attributes
Following are the ActiveRecord instance methods that will be available after installing this plugin
1.) validate_attributes
2.) validate_attributes_and_save
Usage Examples:
lets assume a User model with some validations as…
class User < ActiveRecord::Base
validates_presence_of :name
validates_length_of :name, :minimum => 5
validates_presence_of :email
validates_presence_of :address
end
1.) validate_attributes
Parameters:
We can specify attributes as parameters in the form of 
nly or :except.
If attributes’ array is given with nly, the method will validate only those attributes.
If given with :except, it will validate all attributes but skip the specified.
@user = User.new
@user.validate_attributes(:only => ["name"]) # => false
@user.errors.full_messages # => ["Name is too short (minimum is 5 characters)", "Name can't be blank"]
@user.name = "sur"
@user.validate_attributes(:only => ["name"]) # => false
@user.errors.full_messages # => ["Name is too short (minimum is 5 characters)"]
@user.validate_attributes(:only => ["name", "email"]) # => false
@user.errors.full_messages # => ["Name is too short (minimum is 5 characters)", "Email can't be blank"]
@user.validate_attributes # => false
@user.errors.full_messages # => ["Name is too short (minimum is 5 characters)", "Email can't be blank", "Address can't be blank"]
@user = User.new
@user.validate_attributes(:except => ["name", "email"]) # => false
@user.errors.full_messages # => ["Address can't be blank"]
@user = User.new
@user.validate_attributes(:only => ["address"]) # => false
@user.errors.full_messages # => ["Address can't be blank"]
2.) validate_attributes_and_save
Parameters:
Same as the method validate_attributes
This method will save the object if the function validate_attributes returns true, and will return true if object gets saved
else return false.
@user = User.new
@user.validate_attributes_and_save(:only => [:address]) # => false
@user.new_record? # => true
@user.address = "http://smarteguru.com"
@user.validate_attributes_and_save(:only => [:address]) # => true
@user.new_record? # => false
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Tags: model validation, ror plugin, ruby on rails plugin, validate_attributes
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