module ActiveRecord # Raised by save! and create! when the record is invalid. Use the # record method to retrieve the record which did not validate. # begin # complex_operation_that_calls_save!_internally # rescue ActiveRecord::RecordInvalid => invalid # puts invalid.record.errors # end class RecordInvalid < ActiveRecordError attr_reader :record def initialize(record) @record = record super("Validation failed: #{@record.errors.full_messages.join(", ")}") end end # Active Record validation is reported to and from this object, which is used by Base#save to # determine whether the object in a valid state to be saved. See usage example in Validations. class Errors include Enumerable def initialize(base) # :nodoc: @base, @errors = base, {} end @@default_error_messages = { :inclusion => "is not included in the list", :exclusion => "is reserved", :invalid => "is invalid", :confirmation => "doesn't match confirmation", :accepted => "must be accepted", :empty => "can't be empty", :blank => "can't be blank", :too_long => "is too long (max is %d characters)", :too_short => "is too short (min is %d characters)", :wrong_length => "is the wrong length (should be %d characters)", :taken => "has already been taken", :not_a_number => "is not a number" } # Holds a hash with all the default error messages, such that they can be replaced by your own copy or localizations. cattr_accessor :default_error_messages # 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 (+msg+) to the +attribute+, which will be returned on a call to on(attribute) # for the same attribute and ensure that this error object returns false when asked if empty?. More than one # error can be added to the same +attribute+ in which case an array will be returned on a call to on(attribute). # If no +msg+ is supplied, "invalid" is assumed. def add(attribute, msg = @@default_error_messages[:invalid]) @errors[attribute.to_s] = [] if @errors[attribute.to_s].nil? @errors[attribute.to_s] << msg end # Will add an error message to each of the attributes in +attributes+ that is empty. def add_on_empty(attributes, msg = @@default_error_messages[:empty]) 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, msg) 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, msg = @@default_error_messages[:blank]) for attr in [attributes].flatten value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s] add(attr, msg) if value.blank? end end # Will add an error message to each of the attributes in +attributes+ that has a length outside of the passed boundary +range+. # If the length is above the boundary, the too_long_msg message will be used. If below, the too_short_msg. def add_on_boundary_breaking(attributes, range, too_long_msg = @@default_error_messages[:too_long], too_short_msg = @@default_error_messages[:too_short]) for attr in [attributes].flatten value = @base.respond_to?(attr.to_s) ? @base.send(attr.to_s) : @base[attr.to_s] add(attr, too_short_msg % range.begin) if value && value.length < range.begin add(attr, too_long_msg % range.end) if value && value.length > range.end end end alias :add_on_boundry_breaking :add_on_boundary_breaking # Returns true if the specified +attribute+ has errors associated with it. 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+. def on(attribute) if @errors[attribute.to_s].nil? nil elsif @errors[attribute.to_s].length == 1 @errors[attribute.to_s].first else @errors[attribute.to_s] end end alias :[] :on # Returns errors assigned to base object through add_to_base according to the normal rules of on(attribute). def on_base on(:base) end # Yields each attribute and associated message per error added. def each @errors.each_key { |attr| @errors[attr].each { |msg| yield attr, msg } } end # Yields each full error message added. So Person.errors.add("first_name", "can't be empty") will be returned # through iteration as "First name can't be empty". def each_full full_messages.each { |msg| yield msg } end # Returns all the full error messages in an array. def full_messages full_messages = [] @errors.each_key do |attr| @errors[attr].each do |msg| next if msg.nil? if attr == "base" full_messages << msg else full_messages << @base.class.human_attribute_name(attr) + " " + msg end end end return full_messages end # Returns true if no errors have been added. def empty? return @errors.empty? end # Removes all the 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 # with this as well. def size error_count = 0 @errors.each_value { |attribute| error_count += attribute.length } error_count end alias_method :count, :size alias_method :length, :size end # 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. # # Please do have a look at ActiveRecord::Validations::ClassMethods for a higher level of validations. module Validations VALIDATIONS = %w( validate validate_on_create validate_on_update ) def self.append_features(base) # :nodoc: super base.extend ClassMethods base.class_eval do alias_method :save_without_validation, :save alias_method :save, :save_with_validation alias_method :save_without_validation!, :save! alias_method :save!, :save_with_validation! alias_method :update_attribute_without_validation_skipping, :update_attribute alias_method :update_attribute, :update_attribute_with_validation_skipping end end # All of the following validations are defined in the class scope of the model that you're interested in validating. # They offer a more declarative way of specifying when the model is valid and when it is not. It is recommended to use # these over the low-level calls to validate and validate_on_create when possible. module ClassMethods DEFAULT_VALIDATION_OPTIONS = { :on => :save, :allow_nil => false, :message => nil }.freeze ALL_RANGE_OPTIONS = [ :is, :within, :in, :minimum, :maximum ].freeze def validate(*methods, &block) methods << block if block_given? write_inheritable_set(:validate, methods) end def validate_on_create(*methods, &block) methods << block if block_given? write_inheritable_set(:validate_on_create, methods) end def validate_on_update(*methods, &block) methods << block if block_given? write_inheritable_set(:validate_on_update, methods) end def condition_block?(condition) condition.respond_to?("call") && (condition.arity == 1 || condition.arity == -1) end # Determine from the given condition (whether a block, procedure, method or string) # whether or not to validate the record. See #validates_each. def evaluate_condition(condition, record) case condition when Symbol: record.send(condition) when String: eval(condition, binding) else if condition_block?(condition) condition.call(record) else raise( ActiveRecordError, "Validations need to be either a symbol, string (to be eval'ed), proc/method, or " + "class implementing a static validation method" ) end end end # Validates each attribute against a block. # # class Person < ActiveRecord::Base # validates_each :first_name, :last_name do |record, attr| # record.errors.add attr, 'starts with z.' if attr[0] == ?z # end # end # # Options: # * on - Specifies when this validation is active (default is :save, other options :create, :update) # * allow_nil - Skip validation if attribute is nil. # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_each(*attrs) options = attrs.last.is_a?(Hash) ? attrs.pop.symbolize_keys : {} attrs = attrs.flatten # Declare the validation. send(validation_method(options[:on] || :save)) do |record| # Don't validate when there is an :if condition and that condition is false unless options[:if] && !evaluate_condition(options[:if], record) attrs.each do |attr| value = record.send(attr) next if value.nil? && options[:allow_nil] yield record, attr, value end 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 person has to already have a password attribute (a column in the people table), but the password_confirmation is virtual. # It exists only as an in-memory variable for validating the password. This check is performed only if password_confirmation # is not nil and by default on save. # # Configuration options: # * message - A custom error message (default is: "doesn't match confirmation") # * on - Specifies when this validation is active (default is :save, other options :create, :update) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_confirmation_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:confirmation], :on => :save } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) attr_accessor *(attr_names.map { |n| "#{n}_confirmation" }) validates_each(attr_names, configuration) do |record, attr_name, value| record.errors.add(attr_name, configuration[:message]) unless record.send("#{attr_name}_confirmation").nil? or value == record.send("#{attr_name}_confirmation") 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 # # The terms_of_service attribute is entirely virtual. No database column is needed. This check is performed only if # terms_of_service is not nil and by default on save. # # Configuration options: # * message - A custom error message (default is: "must be accepted") # * on - Specifies when this validation is active (default is :save, other options :create, :update) # * accept - Specifies value that is considered accepted. The default value is a string "1", which # makes it easy to relate to an HTML checkbox. # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_acceptance_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:accepted], :on => :save, :allow_nil => true, :accept => "1" } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) attr_accessor *attr_names validates_each(attr_names,configuration) do |record, attr_name, value| record.errors.add(attr_name, configuration[:message]) unless value == configuration[:accept] 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. # # Configuration options: # * message - A custom error message (default is: "can't be blank") # * on - Specifies when this validation is active (default is :save, other options :create, :update) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_presence_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:blank], :on => :save } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) # can't use validates_each here, because it cannot cope with nonexistent attributes, # while errors.add_on_empty can attr_names.each do |attr_name| send(validation_method(configuration[:on])) do |record| unless configuration[:if] and not evaluate_condition(configuration[:if], record) record.errors.add_on_blank(attr_name,configuration[:message]) end end 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 %d if you don't mind" # validates_length_of :fax, :in => 7..32, :allow_nil => 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 %d character" # validates_length_of :smurf_leader, :is=>4, :message=>"papa is spelled with %d characters... don't play me." # end # # Configuration options: # * minimum - The minimum size of the attribute # * maximum - The maximum size of the attribute # * is - The exact size of the attribute # * within - A range specifying the minimum and maximum size of the attribute # * in - A synonym(or alias) for :within # * allow_nil - Attribute may be nil; skip validation. # # * too_long - The error message if the attribute goes over the maximum (default is: "is too long (max is %d characters)") # * too_short - The error message if the attribute goes under the minimum (default is: "is too short (min is %d characters)") # * wrong_length - The error message if using the :is method and the attribute is the wrong size (default is: "is the wrong length (should be %d characters)") # * message - The error message to use for a :minimum, :maximum, or :is violation. An alias of the appropriate too_long/too_short/wrong_length message # * on - Specifies when this validation is active (default is :save, other options :create, :update) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_length_of(*attrs) # Merge given options with defaults. options = { :too_long => ActiveRecord::Errors.default_error_messages[:too_long], :too_short => ActiveRecord::Errors.default_error_messages[:too_short], :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length] }.merge(DEFAULT_VALIDATION_OPTIONS) options.update(attrs.pop.symbolize_keys) if attrs.last.is_a?(Hash) # 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] case option when :within, :in raise ArgumentError, ":#{option} must be a Range" unless option_value.is_a?(Range) too_short = options[:too_short] % option_value.begin too_long = options[:too_long] % option_value.end validates_each(attrs, options) do |record, attr, value| if value.nil? or value.split(//).size < option_value.begin record.errors.add(attr, too_short) elsif value.split(//).size > option_value.end record.errors.add(attr, too_long) 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 => "<=" } message_options = { :is => :wrong_length, :minimum => :too_short, :maximum => :too_long } message = (options[:message] || options[message_options[option]]) % option_value validates_each(attrs, options) do |record, attr, value| if value.kind_of?(String) record.errors.add(attr, message) unless !value.nil? and value.split(//).size.method(validity_checks[option])[option_value] else record.errors.add(attr, message) unless !value.nil? and value.size.method(validity_checks[option])[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: # * message - Specifies a custom error message (default is: "has already been taken") # * scope - One or more columns by which to limit the scope of the uniquness constraint. # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_uniqueness_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:taken] } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) validates_each(attr_names,configuration) do |record, attr_name, value| condition_sql = "#{record.class.table_name}.#{attr_name} #{attribute_condition(value)}" condition_params = [value] if scope = configuration[:scope] Array(scope).map do |scope_item| scope_value = record.send(scope_item) condition_sql << " AND #{record.class.table_name}.#{scope_item} #{attribute_condition(scope_value)}" condition_params << scope_value end end unless record.new_record? condition_sql << " AND #{record.class.table_name}.#{record.class.primary_key} <> ?" condition_params << record.send(:id) end if record.class.find(:first, :conditions => [condition_sql, *condition_params]) record.errors.add(attr_name, configuration[:message]) 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 => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i, :on => :create # end # # A regular expression must be provided or else an exception will be raised. # # Configuration options: # * message - A custom error message (default is: "is invalid") # * with - The regular expression used to validate the format with (note: must be supplied!) # * on Specifies when this validation is active (default is :save, other options :create, :update) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_format_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save, :with => nil } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) 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| record.errors.add(attr_name, configuration[:message]) unless value.to_s =~ configuration[:with] 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 ), :message=>"woah! what are you then!??!!" # validates_inclusion_of :age, :in=>0..99 # end # # Configuration options: # * in - An enumerable object of available items # * message - Specifies a customer error message (default is: "is not included in the list") # * allow_nil - If set to true, skips this validation if the attribute is null (default is: false) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_inclusion_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:inclusion], :on => :save } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) 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| record.errors.add(attr_name, configuration[:message]) unless enum.include?(value) 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" # end # # Configuration options: # * in - An enumerable object of items that the value shouldn't be part of # * message - Specifies a customer error message (default is: "is reserved") # * allow_nil - If set to true, skips this validation if the attribute is null (default is: false) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_exclusion_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:exclusion], :on => :save } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) 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| record.errors.add(attr_name, configuration[:message]) if enum.include?(value) 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: # * on Specifies when this validation is active (default is :save, other options :create, :update) # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_associated(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) validates_each(attr_names, configuration) do |record, attr_name, value| record.errors.add(attr_name, configuration[:message]) unless (value.is_a?(Array) ? value : [value]).all? { |r| r.nil? or r.valid? } end end # Validates whether the value of the specified attribute is numeric by trying to convert it to # a float with Kernel.Float (if integer is false) or applying it to the regular expression # /^[\+\-]?\d+$/ (if integer is set to true). # # class Person < ActiveRecord::Base # validates_numericality_of :value, :on => :create # end # # Configuration options: # * message - A custom error message (default is: "is not a number") # * on Specifies when this validation is active (default is :save, other options :create, :update) # * only_integer Specifies whether the value has to be an integer, e.g. an integral value (default is false) # * allow_nil Skip validation if attribute is nil (default is false). Notice that for fixnum and float columns empty strings are converted to nil # * if - Specifies a method, proc or string to call to determine if the validation should # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The # method, proc or string should return or evaluate to a true or false value. def validates_numericality_of(*attr_names) configuration = { :message => ActiveRecord::Errors.default_error_messages[:not_a_number], :on => :save, :only_integer => false, :allow_nil => false } configuration.update(attr_names.pop) if attr_names.last.is_a?(Hash) if configuration[:only_integer] validates_each(attr_names,configuration) do |record, attr_name,value| record.errors.add(attr_name, configuration[:message]) unless record.send("#{attr_name}_before_type_cast").to_s =~ /^[+-]?\d+$/ end else validates_each(attr_names,configuration) do |record, attr_name,value| next if configuration[:allow_nil] and record.send("#{attr_name}_before_type_cast").nil? begin Kernel.Float(record.send("#{attr_name}_before_type_cast").to_s) rescue ArgumentError, TypeError record.errors.add(attr_name, configuration[:message]) 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) if attributes.is_a?(Array) attributes.collect { |attr| create!(attr) } else attributes.reverse_merge!(scope(:create)) if scoped?(:create) object = new(attributes) object.save! object end end private def write_inheritable_set(key, methods) existing_methods = read_inheritable_attribute(key) || [] write_inheritable_attribute(key, methods | existing_methods) end 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) if perform_validation && valid? || !perform_validation save_without_validation else false end end # Attempts to save the record just like Base#save but will raise a RecordInvalid exception instead of returning false # if the record is not valid. def save_with_validation! if valid? save_without_validation! else raise RecordInvalid.new(self) end end # Updates a single attribute and saves the record without going through the normal validation procedure. # This is especially useful for boolean flags on existing records. The regular +update_attribute+ method # in Base is replaced with this when the validations module is mixed in, which it is by default. def update_attribute_with_validation_skipping(name, value) send(name.to_s + '=', value) save(false) 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_validations(:validate) validate if new_record? run_validations(:validate_on_create) validate_on_create else run_validations(:validate_on_update) validate_on_update end errors.empty? 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 Errors.add(field, msg) for invalid attributes. def validate #:doc: end # Overwrite this method for validation checks used only on creation. def validate_on_create #:doc: end # Overwrite this method for validation checks used only on updates. def validate_on_update # :doc: end private def run_validations(validation_method) validations = self.class.read_inheritable_attribute(validation_method.to_sym) if validations.nil? then return end validations.each do |validation| if validation.is_a?(Symbol) self.send(validation) elsif validation.is_a?(String) eval(validation, binding) elsif validation_block?(validation) validation.call(self) elsif validation_class?(validation, validation_method) validation.send(validation_method, self) else raise( ActiveRecordError, "Validations need to be either a symbol, string (to be eval'ed), proc/method, or " + "class implementing a static validation method" ) end end end def validation_block?(validation) validation.respond_to?("call") && (validation.arity == 1 || validation.arity == -1) end def validation_class?(validation, validation_method) validation.respond_to?(validation_method) end end end