/usr/lib/ruby/vendor_ruby/active_model/attribute_methods.rb is in ruby-activemodel-3.2 3.2.6-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 | require 'active_support/core_ext/hash/keys'
require 'active_support/core_ext/class/attribute'
require 'active_support/deprecation'
module ActiveModel
class MissingAttributeError < NoMethodError
end
# == Active Model Attribute Methods
#
# <tt>ActiveModel::AttributeMethods</tt> provides a way to add prefixes and suffixes
# to your methods as well as handling the creation of Active Record like class methods
# such as +table_name+.
#
# The requirements to implement ActiveModel::AttributeMethods are to:
#
# * <tt>include ActiveModel::AttributeMethods</tt> in your object
# * Call each Attribute Method module method you want to add, such as
# attribute_method_suffix or attribute_method_prefix
# * Call <tt>define_attribute_methods</tt> after the other methods are
# called.
# * Define the various generic +_attribute+ methods that you have declared
#
# A minimal implementation could be:
#
# class Person
# include ActiveModel::AttributeMethods
#
# attribute_method_affix :prefix => 'reset_', :suffix => '_to_default!'
# attribute_method_suffix '_contrived?'
# attribute_method_prefix 'clear_'
# define_attribute_methods ['name']
#
# attr_accessor :name
#
# private
#
# def attribute_contrived?(attr)
# true
# end
#
# def clear_attribute(attr)
# send("#{attr}=", nil)
# end
#
# def reset_attribute_to_default!(attr)
# send("#{attr}=", "Default Name")
# end
# end
#
# Note that whenever you include ActiveModel::AttributeMethods in your class,
# it requires you to implement an <tt>attributes</tt> method which returns a hash
# with each attribute name in your model as hash key and the attribute value as
# hash value.
#
# Hash keys must be strings.
#
module AttributeMethods
extend ActiveSupport::Concern
NAME_COMPILABLE_REGEXP = /\A[a-zA-Z_]\w*[!?=]?\z/
CALL_COMPILABLE_REGEXP = /\A[a-zA-Z_]\w*[!?]?\z/
included do
class_attribute :attribute_method_matchers, :instance_writer => false
self.attribute_method_matchers = [ClassMethods::AttributeMethodMatcher.new]
end
module ClassMethods
def define_attr_method(name, value=nil, deprecation_warning = true, &block) #:nodoc:
# This deprecation_warning param is for internal use so that we can silence
# the warning from Active Record, because we are implementing more specific
# messages there instead.
#
# It doesn't apply to the original_#{name} method as we want to warn if
# people are calling that regardless.
if deprecation_warning
ActiveSupport::Deprecation.warn("define_attr_method is deprecated and will be removed without replacement.")
end
sing = singleton_class
sing.class_eval <<-eorb, __FILE__, __LINE__ + 1
remove_possible_method :'original_#{name}'
remove_possible_method :'_original_#{name}'
alias_method :'_original_#{name}', :'#{name}'
define_method :'original_#{name}' do
ActiveSupport::Deprecation.warn(
"This method is generated by ActiveModel::AttributeMethods::ClassMethods#define_attr_method, " \
"which is deprecated and will be removed."
)
send(:'_original_#{name}')
end
eorb
if block_given?
sing.send :define_method, name, &block
else
# If we can compile the method name, do it. Otherwise use define_method.
# This is an important *optimization*, please don't change it. define_method
# has slower dispatch and consumes more memory.
if name =~ NAME_COMPILABLE_REGEXP
sing.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{name}; #{value.nil? ? 'nil' : value.to_s.inspect}; end
RUBY
else
value = value.to_s if value
sing.send(:define_method, name) { value }
end
end
end
# Declares a method available for all attributes with the given prefix.
# Uses +method_missing+ and <tt>respond_to?</tt> to rewrite the method.
#
# #{prefix}#{attr}(*args, &block)
#
# to
#
# #{prefix}attribute(#{attr}, *args, &block)
#
# An instance method <tt>#{prefix}attribute</tt> must exist and accept
# at least the +attr+ argument.
#
# For example:
#
# class Person
#
# include ActiveModel::AttributeMethods
# attr_accessor :name
# attribute_method_prefix 'clear_'
# define_attribute_methods [:name]
#
# private
#
# def clear_attribute(attr)
# send("#{attr}=", nil)
# end
# end
#
# person = Person.new
# person.name = "Bob"
# person.name # => "Bob"
# person.clear_name
# person.name # => nil
def attribute_method_prefix(*prefixes)
self.attribute_method_matchers += prefixes.map { |prefix| AttributeMethodMatcher.new :prefix => prefix }
undefine_attribute_methods
end
# Declares a method available for all attributes with the given suffix.
# Uses +method_missing+ and <tt>respond_to?</tt> to rewrite the method.
#
# #{attr}#{suffix}(*args, &block)
#
# to
#
# attribute#{suffix}(#{attr}, *args, &block)
#
# An <tt>attribute#{suffix}</tt> instance method must exist and accept at least
# the +attr+ argument.
#
# For example:
#
# class Person
#
# include ActiveModel::AttributeMethods
# attr_accessor :name
# attribute_method_suffix '_short?'
# define_attribute_methods [:name]
#
# private
#
# def attribute_short?(attr)
# send(attr).length < 5
# end
# end
#
# person = Person.new
# person.name = "Bob"
# person.name # => "Bob"
# person.name_short? # => true
def attribute_method_suffix(*suffixes)
self.attribute_method_matchers += suffixes.map { |suffix| AttributeMethodMatcher.new :suffix => suffix }
undefine_attribute_methods
end
# Declares a method available for all attributes with the given prefix
# and suffix. Uses +method_missing+ and <tt>respond_to?</tt> to rewrite
# the method.
#
# #{prefix}#{attr}#{suffix}(*args, &block)
#
# to
#
# #{prefix}attribute#{suffix}(#{attr}, *args, &block)
#
# An <tt>#{prefix}attribute#{suffix}</tt> instance method must exist and
# accept at least the +attr+ argument.
#
# For example:
#
# class Person
#
# include ActiveModel::AttributeMethods
# attr_accessor :name
# attribute_method_affix :prefix => 'reset_', :suffix => '_to_default!'
# define_attribute_methods [:name]
#
# private
#
# def reset_attribute_to_default!(attr)
# ...
# end
# end
#
# person = Person.new
# person.name # => 'Gem'
# person.reset_name_to_default!
# person.name # => 'Gemma'
def attribute_method_affix(*affixes)
self.attribute_method_matchers += affixes.map { |affix| AttributeMethodMatcher.new :prefix => affix[:prefix], :suffix => affix[:suffix] }
undefine_attribute_methods
end
def alias_attribute(new_name, old_name)
attribute_method_matchers.each do |matcher|
matcher_new = matcher.method_name(new_name).to_s
matcher_old = matcher.method_name(old_name).to_s
define_optimized_call self, matcher_new, matcher_old
end
end
# Declares the attributes that should be prefixed and suffixed by
# ActiveModel::AttributeMethods.
#
# To use, pass in an array of attribute names (as strings or symbols),
# be sure to declare +define_attribute_methods+ after you define any
# prefix, suffix or affix methods, or they will not hook in.
#
# class Person
#
# include ActiveModel::AttributeMethods
# attr_accessor :name, :age, :address
# attribute_method_prefix 'clear_'
#
# # Call to define_attribute_methods must appear after the
# # attribute_method_prefix, attribute_method_suffix or
# # attribute_method_affix declares.
# define_attribute_methods [:name, :age, :address]
#
# private
#
# def clear_attribute(attr)
# ...
# end
# end
def define_attribute_methods(attr_names)
attr_names.each { |attr_name| define_attribute_method(attr_name) }
end
def define_attribute_method(attr_name)
attribute_method_matchers.each do |matcher|
method_name = matcher.method_name(attr_name)
unless instance_method_already_implemented?(method_name)
generate_method = "define_method_#{matcher.method_missing_target}"
if respond_to?(generate_method, true)
send(generate_method, attr_name)
else
define_optimized_call generated_attribute_methods, method_name, matcher.method_missing_target, attr_name.to_s
end
end
end
attribute_method_matchers_cache.clear
end
# Removes all the previously dynamically defined methods from the class
def undefine_attribute_methods
generated_attribute_methods.module_eval do
instance_methods.each { |m| undef_method(m) }
end
attribute_method_matchers_cache.clear
end
# Returns true if the attribute methods defined have been generated.
def generated_attribute_methods #:nodoc:
@generated_attribute_methods ||= begin
mod = Module.new
include mod
mod
end
end
protected
def instance_method_already_implemented?(method_name)
generated_attribute_methods.method_defined?(method_name)
end
private
# The methods +method_missing+ and +respond_to?+ of this module are
# invoked often in a typical rails, both of which invoke the method
# +match_attribute_method?+. The latter method iterates through an
# array doing regular expression matches, which results in a lot of
# object creations. Most of the times it returns a +nil+ match. As the
# match result is always the same given a +method_name+, this cache is
# used to alleviate the GC, which ultimately also speeds up the app
# significantly (in our case our test suite finishes 10% faster with
# this cache).
def attribute_method_matchers_cache #:nodoc:
@attribute_method_matchers_cache ||= {}
end
def attribute_method_matcher(method_name) #:nodoc:
if attribute_method_matchers_cache.key?(method_name)
attribute_method_matchers_cache[method_name]
else
# Must try to match prefixes/suffixes first, or else the matcher with no prefix/suffix
# will match every time.
matchers = attribute_method_matchers.partition(&:plain?).reverse.flatten(1)
match = nil
matchers.detect { |method| match = method.match(method_name) }
attribute_method_matchers_cache[method_name] = match
end
end
# Define a method `name` in `mod` that dispatches to `send`
# using the given `extra` args. This fallbacks `define_method`
# and `send` if the given names cannot be compiled.
def define_optimized_call(mod, name, send, *extra) #:nodoc:
if name =~ NAME_COMPILABLE_REGEXP
defn = "def #{name}(*args)"
else
defn = "define_method(:'#{name}') do |*args|"
end
extra = (extra.map(&:inspect) << "*args").join(", ")
if send =~ CALL_COMPILABLE_REGEXP
target = "#{send}(#{extra})"
else
target = "send(:'#{send}', #{extra})"
end
mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1
#{defn}
#{target}
end
RUBY
end
class AttributeMethodMatcher
attr_reader :prefix, :suffix, :method_missing_target
AttributeMethodMatch = Struct.new(:target, :attr_name, :method_name)
def initialize(options = {})
options.symbolize_keys!
if options[:prefix] == '' || options[:suffix] == ''
ActiveSupport::Deprecation.warn(
"Specifying an empty prefix/suffix for an attribute method is no longer " \
"necessary. If the un-prefixed/suffixed version of the method has not been " \
"defined when `define_attribute_methods` is called, it will be defined " \
"automatically."
)
end
@prefix, @suffix = options[:prefix] || '', options[:suffix] || ''
@regex = /\A(#{Regexp.escape(@prefix)})(.+?)(#{Regexp.escape(@suffix)})\z/
@method_missing_target = "#{@prefix}attribute#{@suffix}"
@method_name = "#{prefix}%s#{suffix}"
end
def match(method_name)
if @regex =~ method_name
AttributeMethodMatch.new(method_missing_target, $2, method_name)
else
nil
end
end
def method_name(attr_name)
@method_name % attr_name
end
def plain?
prefix.empty? && suffix.empty?
end
end
end
# Allows access to the object attributes, which are held in the
# <tt>@attributes</tt> hash, as though they were first-class methods. So a
# Person class with a name attribute can use Person#name and Person#name=
# and never directly use the attributes hash -- except for multiple assigns
# with ActiveRecord#attributes=. A Milestone class can also ask
# Milestone#completed? to test that the completed attribute is not +nil+
# or 0.
#
# It's also possible to instantiate related objects, so a Client class
# belonging to the clients table with a +master_id+ foreign key can
# instantiate master through Client#master.
def method_missing(method, *args, &block)
if respond_to_without_attributes?(method, true)
super
else
match = match_attribute_method?(method.to_s)
match ? attribute_missing(match, *args, &block) : super
end
end
# attribute_missing is like method_missing, but for attributes. When method_missing is
# called we check to see if there is a matching attribute method. If so, we call
# attribute_missing to dispatch the attribute. This method can be overloaded to
# customise the behaviour.
def attribute_missing(match, *args, &block)
__send__(match.target, match.attr_name, *args, &block)
end
# A Person object with a name attribute can ask <tt>person.respond_to?(:name)</tt>,
# <tt>person.respond_to?(:name=)</tt>, and <tt>person.respond_to?(:name?)</tt>
# which will all return +true+.
alias :respond_to_without_attributes? :respond_to?
def respond_to?(method, include_private_methods = false)
if super
true
elsif !include_private_methods && super(method, true)
# If we're here then we haven't found among non-private methods
# but found among all methods. Which means that the given method is private.
false
else
!match_attribute_method?(method.to_s).nil?
end
end
protected
def attribute_method?(attr_name)
respond_to_without_attributes?(:attributes) && attributes.include?(attr_name)
end
private
# Returns a struct representing the matching attribute method.
# The struct's attributes are prefix, base and suffix.
def match_attribute_method?(method_name)
match = self.class.send(:attribute_method_matcher, method_name)
match && attribute_method?(match.attr_name) ? match : nil
end
def missing_attribute(attr_name, stack)
raise ActiveModel::MissingAttributeError, "missing attribute: #{attr_name}", stack
end
end
end
|