105 lines
3.8 KiB
Ruby
105 lines
3.8 KiB
Ruby
module ActiveModel
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module Validations
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extend ActiveSupport::Concern
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include ActiveSupport::Callbacks
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included do
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define_callbacks :validate
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end
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module ClassMethods
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# Adds a validation method or block to the class. This is useful when
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# overriding the +validate+ instance method becomes too unwieldly and
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# you're looking for more descriptive declaration of your validations.
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#
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# This can be done with a symbol pointing to a method:
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#
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# class Comment < ActiveRecord::Base
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# validate :must_be_friends
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#
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# def must_be_friends
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# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# Or with a block which is passed the current record to be validated:
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#
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# class Comment < ActiveRecord::Base
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# validate do |comment|
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# comment.must_be_friends
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# end
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#
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# def must_be_friends
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# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
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# end
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# end
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#
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# This usage applies to +validate_on_create+ and +validate_on_update as well+.
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# Validates each attribute against a block.
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#
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# class Person < ActiveRecord::Base
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# validates_each :first_name, :last_name do |record, attr, value|
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# record.errors.add attr, 'starts with z.' if value[0] == ?z
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# end
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# end
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#
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# Options:
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
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# * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+.
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# * <tt>:allow_blank</tt> - Skip validation if attribute is blank.
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_each(*attrs)
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options = attrs.extract_options!.symbolize_keys
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attrs = attrs.flatten
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# Declare the validation.
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send(validation_method(options[:on]), options) do |record|
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attrs.each do |attr|
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value = record.get_attribute_value(attr)
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next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
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yield record, attr, value
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end
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end
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end
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private
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def validation_method(on)
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:validate
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end
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end
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# Returns the Errors object that holds all information about attribute error messages.
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def errors
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@errors ||= Errors.new(self)
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end
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# Runs all the specified validations and returns true if no errors were added otherwise false.
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def valid?
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errors.clear
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run_callbacks(:validate)
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errors.empty?
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end
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# Performs the opposite of <tt>valid?</tt>. Returns true if errors were added, false otherwise.
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def invalid?
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!valid?
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end
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def get_attribute_value(attribute)
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respond_to?(attribute.to_sym) ? send(attribute.to_sym) : instance_variable_get(:"@#{attribute}")
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end
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end
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end
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Dir[File.dirname(__FILE__) + "/validations/*.rb"].sort.each do |path|
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filename = File.basename(path)
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require "active_model/validations/#{filename}"
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end
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