108 lines
4.1 KiB
Ruby
108 lines
4.1 KiB
Ruby
require 'active_support/core_ext/hash/slice'
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module ActiveModel
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module Validations
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module ClassMethods
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# This method is a shortcut to all default validators and any custom
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# validator classes ending in 'Validator'. Note that Rails default
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# validators can be overridden inside specific classes by creating
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# custom validator classes in their place such as PresenceValidator.
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#
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# Examples of using the default rails validators:
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#
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# validates :terms, :acceptance => true
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# validates :password, :confirmation => true
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# validates :username, :exclusion => { :in => %w(admin superuser) }
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# validates :email, :format => { :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create }
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# validates :age, :inclusion => { :in => 0..9 }
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# validates :first_name, :length => { :maximum => 30 }
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# validates :age, :numericality => true
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# validates :username, :presence => true
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# validates :username, :uniqueness => true
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#
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# The power of the +validates+ method comes when using cusom validators
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# and default validators in one call for a given attribute e.g.
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#
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# class EmailValidator < ActiveModel::EachValidator
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# def validate_each(record, attribute, value)
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# record.errors[attribute] << (options[:message] || "is not an email") unless
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# value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
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# end
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# end
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#
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# class Person
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# include ActiveModel::Validations
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# attr_accessor :name, :email
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#
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# validates :name, :presence => true, :uniqueness => true, :length => { :maximum => 100 }
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# validates :email, :presence => true, :email => true
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# end
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#
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# Validator classes my also exist within the class being validated
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# allowing custom modules of validators to be included as needed e.g.
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#
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# class Film
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# include ActiveModel::Validations
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#
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# class TitleValidator < ActiveModel::EachValidator
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# def validate_each(record, attribute, value)
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# record.errors[attribute] << "must start with 'the'" unless =~ /^the/i
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# end
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# end
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#
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# validates :name, :title => true
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# end
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#
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# The validators hash can also handle regular expressions, ranges and arrays:
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#
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# validates :email, :format => /@/
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# validates :gender, :inclusion => %w(male female)
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# validates :password, :length => 6..20
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#
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# Finally, the options :if, :unless, :on, :allow_blank and :allow_nil can be given
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# to one specific validator:
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#
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# validates :password, :presence => { :if => :password_required? }, :confirmation => true
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#
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# Or to all at the same time:
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#
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# validates :password, :presence => true, :confirmation => true, :if => :password_required?
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#
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def validates(*attributes)
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defaults = attributes.extract_options!
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validations = defaults.slice!(:if, :unless, :on, :allow_blank, :allow_nil)
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raise ArgumentError, "You need to supply at least one attribute" if attributes.empty?
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raise ArgumentError, "Attribute names must be symbols" if attributes.any?{ |attribute| !attribute.is_a?(Symbol) }
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raise ArgumentError, "You need to supply at least one validation" if validations.empty?
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defaults.merge!(:attributes => attributes)
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validations.each do |key, options|
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begin
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validator = const_get("#{key.to_s.camelize}Validator")
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rescue NameError
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raise ArgumentError, "Unknown validator: '#{key}'"
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end
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validates_with(validator, defaults.merge(_parse_validates_options(options)))
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end
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end
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protected
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def _parse_validates_options(options) #:nodoc:
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case options
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when TrueClass
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{}
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when Hash
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options
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when Regexp
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{ :with => options }
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when Range, Array
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{ :in => options }
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end
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end
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end
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end
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end |