diff options
Diffstat (limited to 'activerecord/lib/active_record/validations.rb')
| -rw-r--r-- | activerecord/lib/active_record/validations.rb | 1003 |
1 files changed, 2 insertions, 1001 deletions
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb index d2d12b80c9..a7043516a7 100644 --- a/activerecord/lib/active_record/validations.rb +++ b/activerecord/lib/active_record/validations.rb @@ -14,971 +14,17 @@ module ActiveRecord end end - # Active Record validation is reported to and from this object, which is used by Base#save to - # determine whether the object is in a valid state to be saved. See usage example in Validations. - class Errors - include Enumerable - - class << self - def default_error_messages - ActiveSupport::Deprecation.warn("ActiveRecord::Errors.default_error_messages has been deprecated. Please use I18n.translate('activerecord.errors.messages').") - I18n.translate 'activerecord.errors.messages' - end - end - - def initialize(base) # :nodoc: - @base, @errors = base, {} - end - - # Adds an error to the base object instead of any particular attribute. This is used - # to report errors that don't tie to any specific attribute, but rather to the object - # as a whole. These error messages don't get prepended with any field name when iterating - # with +each_full+, so they should be complete sentences. - def add_to_base(msg) - add(:base, msg) - end - - # Adds an error message (+messsage+) to the +attribute+, which will be returned on a call to <tt>on(attribute)</tt> - # for the same attribute and ensure that this error object returns false when asked if <tt>empty?</tt>. More than one - # error can be added to the same +attribute+ in which case an array will be returned on a call to <tt>on(attribute)</tt>. - # If no +messsage+ is supplied, :invalid is assumed. - # If +message+ is a Symbol, it will be translated, using the appropriate scope (see translate_error). - def add(attribute, message = nil, options = {}) - message ||= :invalid - message = generate_message(attribute, message, options) if message.is_a?(Symbol) - @errors[attribute.to_s] ||= [] - @errors[attribute.to_s] << message - end - - # Will add an error message to each of the attributes in +attributes+ that is empty. - def add_on_empty(attributes, custom_message = nil) - for attr in [attributes].flatten - value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s] - is_empty = value.respond_to?(:empty?) ? value.empty? : false - add(attr, :empty, :default => custom_message) unless !value.nil? && !is_empty - end - end - - # Will add an error message to each of the attributes in +attributes+ that is blank (using Object#blank?). - def add_on_blank(attributes, custom_message = nil) - for attr in [attributes].flatten - value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s] - add(attr, :blank, :default => custom_message) if value.blank? - end - end - - # Translates an error message in it's default scope (<tt>activerecord.errrors.messages</tt>). - # Error messages are first looked up in <tt>models.MODEL.attributes.ATTRIBUTE.MESSAGE</tt>, if it's not there, - # it's looked up in <tt>models.MODEL.MESSAGE</tt> and if that is not there it returns the translation of the - # default message (e.g. <tt>activerecord.errors.messages.MESSAGE</tt>). The translated model name, - # translated attribute name and the value are available for interpolation. - # - # When using inheritence in your models, it will check all the inherited models too, but only if the model itself - # hasn't been found. Say you have <tt>class Admin < User; end</tt> and you wanted the translation for the <tt>:blank</tt> - # error +message+ for the <tt>title</tt> +attribute+, it looks for these translations: - # - # <ol> - # <li><tt>activerecord.errors.models.admin.attributes.title.blank</tt></li> - # <li><tt>activerecord.errors.models.admin.blank</tt></li> - # <li><tt>activerecord.errors.models.user.attributes.title.blank</tt></li> - # <li><tt>activerecord.errors.models.user.blank</tt></li> - # <li><tt>activerecord.errors.messages.blank</tt></li> - # <li>any default you provided through the +options+ hash (in the activerecord.errors scope)</li> - # </ol> - def generate_message(attribute, message = :invalid, options = {}) - - message, options[:default] = options[:default], message if options[:default].is_a?(Symbol) - - defaults = @base.class.self_and_descendants_from_active_record.map do |klass| - [ :"models.#{klass.name.underscore}.attributes.#{attribute}.#{message}", - :"models.#{klass.name.underscore}.#{message}" ] - end - - defaults << options.delete(:default) - defaults = defaults.compact.flatten << :"messages.#{message}" - - key = defaults.shift - value = @base.respond_to?(attribute) ? @base.send(attribute) : nil - - options = { :default => defaults, - :model => @base.class.human_name, - :attribute => @base.class.human_attribute_name(attribute.to_s), - :value => value, - :scope => [:activerecord, :errors] - }.merge(options) - - I18n.translate(key, options) - end - - # Returns true if the specified +attribute+ has errors associated with it. - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.invalid?(:name) # => true - # company.errors.invalid?(:address) # => false - def invalid?(attribute) - !@errors[attribute.to_s].nil? - end - - # Returns +nil+, if no errors are associated with the specified +attribute+. - # Returns the error message, if one error is associated with the specified +attribute+. - # Returns an array of error messages, if more than one error is associated with the specified +attribute+. - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.on(:name) # => ["is too short (minimum is 5 characters)", "can't be blank"] - # company.errors.on(:email) # => "can't be blank" - # company.errors.on(:address) # => nil - def on(attribute) - errors = @errors[attribute.to_s] - return nil if errors.nil? - errors.size == 1 ? errors.first : errors - end - - alias :[] :on - - # Returns errors assigned to the base object through +add_to_base+ according to the normal rules of <tt>on(attribute)</tt>. - def on_base - on(:base) - end - - # Yields each attribute and associated message per error added. - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.each{|attr,msg| puts "#{attr} - #{msg}" } - # # => name - is too short (minimum is 5 characters) - # # name - can't be blank - # # address - can't be blank - def each - @errors.each_key { |attr| @errors[attr].each { |msg| yield attr, msg } } - end - - # Yields each full error message added. So <tt>Person.errors.add("first_name", "can't be empty")</tt> will be returned - # through iteration as "First name can't be empty". - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.each_full{|msg| puts msg } - # # => Name is too short (minimum is 5 characters) - # # Name can't be blank - # # Address can't be blank - def each_full - full_messages.each { |msg| yield msg } - end - - # Returns all the full error messages in an array. - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.full_messages # => - # ["Name is too short (minimum is 5 characters)", "Name can't be blank", "Address can't be blank"] - def full_messages(options = {}) - full_messages = [] - - @errors.each_key do |attr| - @errors[attr].each do |message| - next unless message - - if attr == "base" - full_messages << message - else - attr_name = @base.class.human_attribute_name(attr) - full_messages << attr_name + I18n.t('activerecord.errors.format.separator', :default => ' ') + message - end - end - end - full_messages - end - - # Returns true if no errors have been added. - def empty? - @errors.empty? - end - - # Removes all errors that have been added. - def clear - @errors = {} - end - - # Returns the total number of errors added. Two errors added to the same attribute will be counted as such. - def size - @errors.values.inject(0) { |error_count, attribute| error_count + attribute.size } - end - - alias_method :count, :size - alias_method :length, :size - - # Returns an XML representation of this error object. - # - # class Company < ActiveRecord::Base - # validates_presence_of :name, :address, :email - # validates_length_of :name, :in => 5..30 - # end - # - # company = Company.create(:address => '123 First St.') - # company.errors.to_xml - # # => <?xml version="1.0" encoding="UTF-8"?> - # # <errors> - # # <error>Name is too short (minimum is 5 characters)</error> - # # <error>Name can't be blank</error> - # # <error>Address can't be blank</error> - # # </errors> - def to_xml(options={}) - options[:root] ||= "errors" - options[:indent] ||= 2 - options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent]) - - options[:builder].instruct! unless options.delete(:skip_instruct) - options[:builder].errors do |e| - full_messages.each { |msg| e.error(msg) } - end - end - - end - - - # Please do have a look at ActiveRecord::Validations::ClassMethods for a higher level of validations. - # - # Active Records implement validation by overwriting Base#validate (or the variations, +validate_on_create+ and - # +validate_on_update+). Each of these methods can inspect the state of the object, which usually means ensuring - # that a number of attributes have a certain value (such as not empty, within a given range, matching a certain regular expression). - # - # Example: - # - # class Person < ActiveRecord::Base - # protected - # def validate - # errors.add_on_empty %w( first_name last_name ) - # errors.add("phone_number", "has invalid format") unless phone_number =~ /[0-9]*/ - # end - # - # def validate_on_create # is only run the first time a new object is saved - # unless valid_discount?(membership_discount) - # errors.add("membership_discount", "has expired") - # end - # end - # - # def validate_on_update - # errors.add_to_base("No changes have occurred") if unchanged_attributes? - # end - # end - # - # person = Person.new("first_name" => "David", "phone_number" => "what?") - # person.save # => false (and doesn't do the save) - # person.errors.empty? # => false - # person.errors.count # => 2 - # person.errors.on "last_name" # => "can't be empty" - # person.errors.on "phone_number" # => "has invalid format" - # person.errors.each_full { |msg| puts msg } - # # => "Last name can't be empty\n" + - # # "Phone number has invalid format" - # - # person.attributes = { "last_name" => "Heinemeier", "phone_number" => "555-555" } - # person.save # => true (and person is now saved in the database) - # - # An Errors object is automatically created for every Active Record. module Validations - VALIDATIONS = %w( validate validate_on_create validate_on_update ) - def self.included(base) # :nodoc: base.extend ClassMethods + base.class_eval do alias_method_chain :save, :validation alias_method_chain :save!, :validation end - - base.send :include, ActiveSupport::Callbacks - base.define_callbacks *VALIDATIONS end - # Active Record classes can implement validations in several ways. The highest level, easiest to read, - # and recommended approach is to use the declarative <tt>validates_..._of</tt> class methods (and - # +validates_associated+) documented below. These are sufficient for most model validations. - # - # Slightly lower level is +validates_each+. It provides some of the same options as the purely declarative - # validation methods, but like all the lower-level approaches it requires manually adding to the errors collection - # when the record is invalid. - # - # At a yet lower level, a model can use the class methods +validate+, +validate_on_create+ and +validate_on_update+ - # to add validation methods or blocks. These are ActiveSupport::Callbacks and follow the same rules of inheritance - # and chaining. - # - # The lowest level style is to define the instance methods +validate+, +validate_on_create+ and +validate_on_update+ - # as documented in ActiveRecord::Validations. - # - # == +validate+, +validate_on_create+ and +validate_on_update+ Class Methods - # - # Calls to these methods add a validation method or block to the class. Again, this approach is recommended - # only when the higher-level methods documented below (<tt>validates_..._of</tt> and +validates_associated+) are - # insufficient to handle the required validation. - # - # This can be done with a symbol pointing to a method: - # - # class Comment < ActiveRecord::Base - # validate :must_be_friends - # - # def must_be_friends - # errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee) - # end - # end - # - # Or with a block which is passed the current record to be validated: - # - # class Comment < ActiveRecord::Base - # validate do |comment| - # comment.must_be_friends - # end - # - # def must_be_friends - # errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee) - # end - # end - # - # This usage applies to +validate_on_create+ and +validate_on_update+ as well. module ClassMethods - DEFAULT_VALIDATION_OPTIONS = { - :on => :save, - :allow_nil => false, - :allow_blank => false, - :message => nil - }.freeze - - ALL_RANGE_OPTIONS = [ :is, :within, :in, :minimum, :maximum ].freeze - ALL_NUMERICALITY_CHECKS = { :greater_than => '>', :greater_than_or_equal_to => '>=', - :equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=', - :odd => 'odd?', :even => 'even?' }.freeze - - # Validates each attribute against a block. - # - # class Person < ActiveRecord::Base - # validates_each :first_name, :last_name do |record, attr, value| - # record.errors.add attr, 'starts with z.' if value[0] == ?z - # end - # end - # - # Options: - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+. - # * <tt>:allow_blank</tt> - Skip validation if attribute is blank. - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_each(*attrs) - options = attrs.extract_options!.symbolize_keys - attrs = attrs.flatten - - # Declare the validation. - send(validation_method(options[:on] || :save), options) do |record| - attrs.each do |attr| - value = record.send(attr) - next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank]) - yield record, attr, value - end - end - end - - # Encapsulates the pattern of wanting to validate a password or email address field with a confirmation. Example: - # - # Model: - # class Person < ActiveRecord::Base - # validates_confirmation_of :user_name, :password - # validates_confirmation_of :email_address, :message => "should match confirmation" - # end - # - # View: - # <%= password_field "person", "password" %> - # <%= password_field "person", "password_confirmation" %> - # - # The added +password_confirmation+ attribute is virtual; it exists only as an in-memory attribute for validating the password. - # To achieve this, the validation adds accessors to the model for the confirmation attribute. NOTE: This check is performed - # only if +password_confirmation+ is not +nil+, and by default only on save. To require confirmation, make sure to add a presence - # check for the confirmation attribute: - # - # validates_presence_of :password_confirmation, :if => :password_changed? - # - # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "doesn't match confirmation"). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_confirmation_of(*attr_names) - configuration = { :on => :save } - configuration.update(attr_names.extract_options!) - - attr_accessor(*(attr_names.map { |n| "#{n}_confirmation" })) - - validates_each(attr_names, configuration) do |record, attr_name, value| - unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation") - record.errors.add(attr_name, :confirmation, :default => configuration[:message]) - end - end - end - - # Encapsulates the pattern of wanting to validate the acceptance of a terms of service check box (or similar agreement). Example: - # - # class Person < ActiveRecord::Base - # validates_acceptance_of :terms_of_service - # validates_acceptance_of :eula, :message => "must be abided" - # end - # - # If the database column does not exist, the +terms_of_service+ attribute is entirely virtual. This check is - # performed only if +terms_of_service+ is not +nil+ and by default on save. - # - # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "must be accepted"). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is true). - # * <tt>:accept</tt> - Specifies value that is considered accepted. The default value is a string "1", which - # makes it easy to relate to an HTML checkbox. This should be set to +true+ if you are validating a database - # column, since the attribute is typecast from "1" to +true+ before validation. - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_acceptance_of(*attr_names) - configuration = { :on => :save, :allow_nil => true, :accept => "1" } - configuration.update(attr_names.extract_options!) - - db_cols = begin - column_names - rescue Exception # To ignore both statement and connection errors - [] - end - names = attr_names.reject { |name| db_cols.include?(name.to_s) } - attr_accessor(*names) - - validates_each(attr_names,configuration) do |record, attr_name, value| - unless value == configuration[:accept] - record.errors.add(attr_name, :accepted, :default => configuration[:message]) - end - end - end - - # Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example: - # - # class Person < ActiveRecord::Base - # validates_presence_of :first_name - # end - # - # The first_name attribute must be in the object and it cannot be blank. - # - # If you want to validate the presence of a boolean field (where the real values are true and false), - # you will want to use <tt>validates_inclusion_of :field_name, :in => [true, false]</tt>. - # - # This is due to the way Object#blank? handles boolean values: <tt>false.blank? # => true</tt>. - # - # Configuration options: - # * <tt>message</tt> - A custom error message (default is: "can't be blank"). - # * <tt>on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, - # <tt>:update</tt>). - # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). - # The method, proc or string should return or evaluate to a true or false value. - # * <tt>unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). - # The method, proc or string should return or evaluate to a true or false value. - # - def validates_presence_of(*attr_names) - configuration = { :on => :save } - configuration.update(attr_names.extract_options!) - - # can't use validates_each here, because it cannot cope with nonexistent attributes, - # while errors.add_on_empty can - send(validation_method(configuration[:on]), configuration) do |record| - record.errors.add_on_blank(attr_names, configuration[:message]) - end - end - - # Validates that the specified attribute matches the length restrictions supplied. Only one option can be used at a time: - # - # class Person < ActiveRecord::Base - # validates_length_of :first_name, :maximum=>30 - # validates_length_of :last_name, :maximum=>30, :message=>"less than {{count}} if you don't mind" - # validates_length_of :fax, :in => 7..32, :allow_nil => true - # validates_length_of :phone, :in => 7..32, :allow_blank => true - # validates_length_of :user_name, :within => 6..20, :too_long => "pick a shorter name", :too_short => "pick a longer name" - # validates_length_of :fav_bra_size, :minimum => 1, :too_short => "please enter at least {{count}} character" - # validates_length_of :smurf_leader, :is => 4, :message => "papa is spelled with {{count}} characters... don't play me." - # validates_length_of :essay, :minimum => 100, :too_short => "Your essay must be at least {{count}} words."), :tokenizer => lambda {|str| str.scan(/\w+/) } - # end - # - # Configuration options: - # * <tt>:minimum</tt> - The minimum size of the attribute. - # * <tt>:maximum</tt> - The maximum size of the attribute. - # * <tt>:is</tt> - The exact size of the attribute. - # * <tt>:within</tt> - A range specifying the minimum and maximum size of the attribute. - # * <tt>:in</tt> - A synonym(or alias) for <tt>:within</tt>. - # * <tt>:allow_nil</tt> - Attribute may be +nil+; skip validation. - # * <tt>:allow_blank</tt> - Attribute may be blank; skip validation. - # * <tt>:too_long</tt> - The error message if the attribute goes over the maximum (default is: "is too long (maximum is {{count}} characters)"). - # * <tt>:too_short</tt> - The error message if the attribute goes under the minimum (default is: "is too short (min is {{count}} characters)"). - # * <tt>:wrong_length</tt> - The error message if using the <tt>:is</tt> method and the attribute is the wrong size (default is: "is the wrong length (should be {{count}} characters)"). - # * <tt>:message</tt> - The error message to use for a <tt>:minimum</tt>, <tt>:maximum</tt>, or <tt>:is</tt> violation. An alias of the appropriate <tt>too_long</tt>/<tt>too_short</tt>/<tt>wrong_length</tt> message. - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:tokenizer</tt> - Specifies how to split up the attribute string. (e.g. <tt>:tokenizer => lambda {|str| str.scan(/\w+/)}</tt> to - # count words as in above example.) - # Defaults to <tt>lambda{ |value| value.split(//) }</tt> which counts individual characters. - def validates_length_of(*attrs) - # Merge given options with defaults. - options = { - :tokenizer => lambda {|value| value.split(//)} - }.merge(DEFAULT_VALIDATION_OPTIONS) - options.update(attrs.extract_options!.symbolize_keys) - - # Ensure that one and only one range option is specified. - range_options = ALL_RANGE_OPTIONS & options.keys - case range_options.size - when 0 - raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.' - when 1 - # Valid number of options; do nothing. - else - raise ArgumentError, 'Too many range options specified. Choose only one.' - end - - # Get range option and value. - option = range_options.first - option_value = options[range_options.first] - key = {:is => :wrong_length, :minimum => :too_short, :maximum => :too_long}[option] - custom_message = options[:message] || options[key] - - case option - when :within, :in - raise ArgumentError, ":#{option} must be a Range" unless option_value.is_a?(Range) - - validates_each(attrs, options) do |record, attr, value| - value = options[:tokenizer].call(value) if value.kind_of?(String) - if value.nil? or value.size < option_value.begin - record.errors.add(attr, :too_short, :default => custom_message || options[:too_short], :count => option_value.begin) - elsif value.size > option_value.end - record.errors.add(attr, :too_long, :default => custom_message || options[:too_long], :count => option_value.end) - end - end - when :is, :minimum, :maximum - raise ArgumentError, ":#{option} must be a nonnegative Integer" unless option_value.is_a?(Integer) and option_value >= 0 - - # Declare different validations per option. - validity_checks = { :is => "==", :minimum => ">=", :maximum => "<=" } - - validates_each(attrs, options) do |record, attr, value| - value = options[:tokenizer].call(value) if value.kind_of?(String) - unless !value.nil? and value.size.method(validity_checks[option])[option_value] - record.errors.add(attr, key, :default => custom_message, :count => option_value) - end - end - end - end - - alias_method :validates_size_of, :validates_length_of - - - # Validates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user - # can be named "davidhh". - # - # class Person < ActiveRecord::Base - # validates_uniqueness_of :user_name, :scope => :account_id - # end - # - # It can also validate whether the value of the specified attributes are unique based on multiple scope parameters. For example, - # making sure that a teacher can only be on the schedule once per semester for a particular class. - # - # class TeacherSchedule < ActiveRecord::Base - # validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id] - # end - # - # When the record is created, a check is performed to make sure that no record exists in the database with the given value for the specified - # attribute (that maps to a column). When the record is updated, the same check is made but disregarding the record itself. - # - # Configuration options: - # * <tt>:message</tt> - Specifies a custom error message (default is: "has already been taken"). - # * <tt>:scope</tt> - One or more columns by which to limit the scope of the uniqueness constraint. - # * <tt>:case_sensitive</tt> - Looks for an exact match. Ignored by non-text columns (+true+ by default). - # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+). - # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # - # === Concurrency and integrity - # - # Using this validation method in conjunction with ActiveRecord::Base#save - # does not guarantee the absence of duplicate record insertions, because - # uniqueness checks on the application level are inherently prone to race - # conditions. For example, suppose that two users try to post a Comment at - # the same time, and a Comment's title must be unique. At the database-level, - # the actions performed by these users could be interleaved in the following manner: - # - # User 1 | User 2 - # ------------------------------------+-------------------------------------- - # # User 1 checks whether there's | - # # already a comment with the title | - # # 'My Post'. This is not the case. | - # SELECT * FROM comments | - # WHERE title = 'My Post' | - # | - # | # User 2 does the same thing and also - # | # infers that his title is unique. - # | SELECT * FROM comments - # | WHERE title = 'My Post' - # | - # # User 1 inserts his comment. | - # INSERT INTO comments | - # (title, content) VALUES | - # ('My Post', 'hi!') | - # | - # | # User 2 does the same thing. - # | INSERT INTO comments - # | (title, content) VALUES - # | ('My Post', 'hello!') - # | - # | # ^^^^^^ - # | # Boom! We now have a duplicate - # | # title! - # - # This could even happen if you use transactions with the 'serializable' - # isolation level. There are several ways to get around this problem: - # - By locking the database table before validating, and unlocking it after - # saving. However, table locking is very expensive, and thus not - # recommended. - # - By locking a lock file before validating, and unlocking it after saving. - # This does not work if you've scaled your Rails application across - # multiple web servers (because they cannot share lock files, or cannot - # do that efficiently), and thus not recommended. - # - Creating a unique index on the field, by using - # ActiveRecord::ConnectionAdapters::SchemaStatements#add_index. In the - # rare case that a race condition occurs, the database will guarantee - # the field's uniqueness. - # - # When the database catches such a duplicate insertion, - # ActiveRecord::Base#save will raise an ActiveRecord::StatementInvalid - # exception. You can either choose to let this error propagate (which - # will result in the default Rails exception page being shown), or you - # can catch it and restart the transaction (e.g. by telling the user - # that the title already exists, and asking him to re-enter the title). - # This technique is also known as optimistic concurrency control: - # http://en.wikipedia.org/wiki/Optimistic_concurrency_control - # - # Active Record currently provides no way to distinguish unique - # index constraint errors from other types of database errors, so you - # will have to parse the (database-specific) exception message to detect - # such a case. - def validates_uniqueness_of(*attr_names) - configuration = { :case_sensitive => true } - configuration.update(attr_names.extract_options!) - - validates_each(attr_names,configuration) do |record, attr_name, value| - # The check for an existing value should be run from a class that - # isn't abstract. This means working down from the current class - # (self), to the first non-abstract class. Since classes don't know - # their subclasses, we have to build the hierarchy between self and - # the record's class. - class_hierarchy = [record.class] - while class_hierarchy.first != self - class_hierarchy.insert(0, class_hierarchy.first.superclass) - end - - # Now we can work our way down the tree to the first non-abstract - # class (which has a database table to query from). - finder_class = class_hierarchy.detect { |klass| !klass.abstract_class? } - - column = finder_class.columns_hash[attr_name.to_s] - - if value.nil? - comparison_operator = "IS ?" - elsif column.text? - comparison_operator = "#{connection.case_sensitive_equality_operator} ?" - value = column.limit ? value.to_s[0, column.limit] : value.to_s - else - comparison_operator = "= ?" - end - - sql_attribute = "#{record.class.quoted_table_name}.#{connection.quote_column_name(attr_name)}" - - if value.nil? || (configuration[:case_sensitive] || !column.text?) - condition_sql = "#{sql_attribute} #{comparison_operator}" - condition_params = [value] - else - condition_sql = "LOWER(#{sql_attribute}) #{comparison_operator}" - condition_params = [value.mb_chars.downcase] - end - - if scope = configuration[:scope] - Array(scope).map do |scope_item| - scope_value = record.send(scope_item) - condition_sql << " AND " << attribute_condition("#{record.class.quoted_table_name}.#{scope_item}", scope_value) - condition_params << scope_value - end - end - - unless record.new_record? - condition_sql << " AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?" - condition_params << record.send(:id) - end - - finder_class.with_exclusive_scope do - if finder_class.exists?([condition_sql, *condition_params]) - record.errors.add(attr_name, :taken, :default => configuration[:message], :value => value) - end - end - end - end - - - # Validates whether the value of the specified attribute is of the correct form by matching it against the regular expression - # provided. - # - # class Person < ActiveRecord::Base - # validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create - # end - # - # Note: use <tt>\A</tt> and <tt>\Z</tt> to match the start and end of the string, <tt>^</tt> and <tt>$</tt> match the start/end of a line. - # - # A regular expression must be provided or else an exception will be raised. - # - # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "is invalid"). - # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+). - # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+). - # * <tt>:with</tt> - The regular expression used to validate the format with (note: must be supplied!). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_format_of(*attr_names) - configuration = { :on => :save, :with => nil } - configuration.update(attr_names.extract_options!) - - raise(ArgumentError, "A regular expression must be supplied as the :with option of the configuration hash") unless configuration[:with].is_a?(Regexp) - - validates_each(attr_names, configuration) do |record, attr_name, value| - unless value.to_s =~ configuration[:with] - record.errors.add(attr_name, :invalid, :default => configuration[:message], :value => value) - end - end - end - - # Validates whether the value of the specified attribute is available in a particular enumerable object. - # - # class Person < ActiveRecord::Base - # validates_inclusion_of :gender, :in => %w( m f ) - # validates_inclusion_of :age, :in => 0..99 - # validates_inclusion_of :format, :in => %w( jpg gif png ), :message => "extension {{value}} is not included in the list" - # end - # - # Configuration options: - # * <tt>:in</tt> - An enumerable object of available items. - # * <tt>:message</tt> - Specifies a custom error message (default is: "is not included in the list"). - # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+). - # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_inclusion_of(*attr_names) - configuration = { :on => :save } - configuration.update(attr_names.extract_options!) - - enum = configuration[:in] || configuration[:within] - - raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?(:include?) - - validates_each(attr_names, configuration) do |record, attr_name, value| - unless enum.include?(value) - record.errors.add(attr_name, :inclusion, :default => configuration[:message], :value => value) - end - end - end - - # Validates that the value of the specified attribute is not in a particular enumerable object. - # - # class Person < ActiveRecord::Base - # validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here" - # validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60" - # validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension {{value}} is not allowed" - # end - # - # Configuration options: - # * <tt>:in</tt> - An enumerable object of items that the value shouldn't be part of. - # * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved"). - # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+). - # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_exclusion_of(*attr_names) - configuration = { :on => :save } - configuration.update(attr_names.extract_options!) - - enum = configuration[:in] || configuration[:within] - - raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?(:include?) - - validates_each(attr_names, configuration) do |record, attr_name, value| - if enum.include?(value) - record.errors.add(attr_name, :exclusion, :default => configuration[:message], :value => value) - end - end - end - - # Validates whether the associated object or objects are all valid themselves. Works with any kind of association. - # - # class Book < ActiveRecord::Base - # has_many :pages - # belongs_to :library - # - # validates_associated :pages, :library - # end - # - # Warning: If, after the above definition, you then wrote: - # - # class Page < ActiveRecord::Base - # belongs_to :book - # - # validates_associated :book - # end - # - # this would specify a circular dependency and cause infinite recursion. - # - # NOTE: This validation will not fail if the association hasn't been assigned. If you want to ensure that the association - # is both present and guaranteed to be valid, you also need to use +validates_presence_of+. - # - # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "is invalid") - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_associated(*attr_names) - configuration = { :on => :save } - configuration.update(attr_names.extract_options!) - - validates_each(attr_names, configuration) do |record, attr_name, value| - unless (value.is_a?(Array) ? value : [value]).collect { |r| r.nil? || r.valid? }.all? - record.errors.add(attr_name, :invalid, :default => configuration[:message], :value => value) - end - end - end - - # Validates whether the value of the specified attribute is numeric by trying to convert it to - # a float with Kernel.Float (if <tt>only_integer</tt> is false) or applying it to the regular expression - # <tt>/\A[\+\-]?\d+\Z/</tt> (if <tt>only_integer</tt> is set to true). - # - # class Person < ActiveRecord::Base - # validates_numericality_of :value, :on => :create - # end - # - # Configuration options: - # * <tt>:message</tt> - A custom error message (default is: "is not a number"). - # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>). - # * <tt>:only_integer</tt> - Specifies whether the value has to be an integer, e.g. an integral value (default is +false+). - # * <tt>:allow_nil</tt> - Skip validation if attribute is +nil+ (default is +false+). Notice that for fixnum and float columns empty strings are converted to +nil+. - # * <tt>:greater_than</tt> - Specifies the value must be greater than the supplied value. - # * <tt>:greater_than_or_equal_to</tt> - Specifies the value must be greater than or equal the supplied value. - # * <tt>:equal_to</tt> - Specifies the value must be equal to the supplied value. - # * <tt>:less_than</tt> - Specifies the value must be less than the supplied value. - # * <tt>:less_than_or_equal_to</tt> - Specifies the value must be less than or equal the supplied value. - # * <tt>:odd</tt> - Specifies the value must be an odd number. - # * <tt>:even</tt> - Specifies the value must be an even number. - # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should - # occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should - # not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The - # method, proc or string should return or evaluate to a true or false value. - def validates_numericality_of(*attr_names) - configuration = { :on => :save, :only_integer => false, :allow_nil => false } - configuration.update(attr_names.extract_options!) - - - numericality_options = ALL_NUMERICALITY_CHECKS.keys & configuration.keys - - (numericality_options - [ :odd, :even ]).each do |option| - raise ArgumentError, ":#{option} must be a number" unless configuration[option].is_a?(Numeric) - end - - validates_each(attr_names,configuration) do |record, attr_name, value| - raw_value = record.send("#{attr_name}_before_type_cast") || value - - next if configuration[:allow_nil] and raw_value.nil? - - if configuration[:only_integer] - unless raw_value.to_s =~ /\A[+-]?\d+\Z/ - record.errors.add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message]) - next - end - raw_value = raw_value.to_i - else - begin - raw_value = Kernel.Float(raw_value) - rescue ArgumentError, TypeError - record.errors.add(attr_name, :not_a_number, :value => raw_value, :default => configuration[:message]) - next - end - end - - numericality_options.each do |option| - case option - when :odd, :even - unless raw_value.to_i.method(ALL_NUMERICALITY_CHECKS[option])[] - record.errors.add(attr_name, option, :value => raw_value, :default => configuration[:message]) - end - else - record.errors.add(attr_name, option, :default => configuration[:message], :value => raw_value, :count => configuration[option]) unless raw_value.method(ALL_NUMERICALITY_CHECKS[option])[configuration[option]] - end - end - end - end - # Creates an object just like Base.create but calls save! instead of save # so an exception is raised if the record is invalid. def create!(attributes = nil, &block) @@ -991,17 +37,8 @@ module ActiveRecord object end end - - private - def validation_method(on) - case on - when :save then :validate - when :create then :validate_on_create - when :update then :validate_on_update - end - end end - + # The validation process on save can be skipped by passing false. The regular Base#save method is # replaced with this when the validations module is mixed in, which it is by default. def save_with_validation(perform_validation = true) @@ -1022,45 +59,9 @@ module ActiveRecord end end - # Runs +validate+ and +validate_on_create+ or +validate_on_update+ and returns true if no errors were added otherwise false. - def valid? - errors.clear - - run_callbacks(:validate) - validate - - if new_record? - run_callbacks(:validate_on_create) - validate_on_create - else - run_callbacks(:validate_on_update) - validate_on_update - end - - errors.empty? - end - - # Performs the opposite of <tt>valid?</tt>. Returns true if errors were added, false otherwise. - def invalid? - !valid? - end - # Returns the Errors object that holds all information about attribute error messages. def errors @errors ||= Errors.new(self) end - - protected - # Overwrite this method for validation checks on all saves and use <tt>Errors.add(field, msg)</tt> for invalid attributes. - def validate - end - - # Overwrite this method for validation checks used only on creation. - def validate_on_create - end - - # Overwrite this method for validation checks used only on updates. - def validate_on_update - end end end |