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author | Jeremy Kemper <jeremy@bitsweat.net> | 2006-07-31 03:43:03 +0000 |
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committer | Jeremy Kemper <jeremy@bitsweat.net> | 2006-07-31 03:43:03 +0000 |
commit | 2b3cc2478fff77fdada9adeabc32ecea0605d7bd (patch) | |
tree | 7aa6ba106ffefa4c571eb7edfe7ca1eabb31b41d /activerecord/lib/active_record/attribute_methods.rb | |
parent | efff453148b4bd2d35d91a3d8344a7bad56da7c3 (diff) | |
download | rails-2b3cc2478fff77fdada9adeabc32ecea0605d7bd.tar.gz rails-2b3cc2478fff77fdada9adeabc32ecea0605d7bd.tar.bz2 rails-2b3cc2478fff77fdada9adeabc32ecea0605d7bd.zip |
r4854@ks: jeremy | 2006-07-30 00:59:18 -0700
Attribute methods
r4877@ks: jeremy | 2006-07-30 20:23:53 -0700
Factor the attribute#{suffix} methods out of method_missing for easier extension.
r4878@ks: jeremy | 2006-07-30 20:42:23 -0700
More specific method naming, declare many attribute method suffixes, set up default suffixes at module include rather than lazily.
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4632 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activerecord/lib/active_record/attribute_methods.rb')
-rw-r--r-- | activerecord/lib/active_record/attribute_methods.rb | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb new file mode 100644 index 0000000000..adc6eb6559 --- /dev/null +++ b/activerecord/lib/active_record/attribute_methods.rb @@ -0,0 +1,75 @@ +module ActiveRecord + module AttributeMethods #:nodoc: + DEFAULT_SUFFIXES = %w(= ? _before_type_cast) + + def self.included(base) + base.extend ClassMethods + base.attribute_method_suffix *DEFAULT_SUFFIXES + end + + # Declare and check for suffixed attribute methods. + module ClassMethods + # Declare a method available for all attributes with the given suffix. + # Uses method_missing and respond_to? to rewrite the method + # #{attr}#{suffix}(*args, &block) + # to + # attribute#{suffix}(#{attr}, *args, &block) + # + # An attribute#{suffix} instance method must exist and accept at least + # the attr argument. + # + # For example: + # class Person < ActiveRecord::Base + # attribute_method_suffix '_changed?' + # + # private + # def attribute_changed?(attr) + # ... + # end + # end + # + # person = Person.find(1) + # person.name_changed? # => false + # person.name = 'Hubert' + # person.name_changed? # => true + def attribute_method_suffix(*suffixes) + attribute_method_suffixes.concat suffixes + rebuild_attribute_method_regexp + end + + # Returns MatchData if method_name is an attribute method. + def match_attribute_method?(method_name) + rebuild_attribute_method_regexp unless defined?(@@attribute_method_regexp) && @@attribute_method_regexp + @@attribute_method_regexp.match(method_name) + end + + private + # Suffixes a, ?, c become regexp /(a|\?|c)$/ + def rebuild_attribute_method_regexp + suffixes = attribute_method_suffixes.map { |s| Regexp.escape(s) } + @@attribute_method_regexp = /(#{suffixes.join('|')})$/.freeze + end + + # Default to =, ?, _before_type_cast + def attribute_method_suffixes + @@attribute_method_suffixes ||= [] + end + end + + private + # Handle *? for method_missing. + def attribute?(attribute_name) + query_attribute(attribute_name) + end + + # Handle *= for method_missing. + def attribute=(attribute_name, value) + write_attribute(attribute_name, value) + end + + # Handle *_before_type_cast for method_missing. + def attribute_before_type_cast(attribute_name) + read_attribute_before_type_cast(attribute_name) + end + end +end |