Module: ActiveSupport::Memoizable

### Home Classes Methods

### In Files

- lib/active_support/memoizable.rb

### Namespace

- MODULE ActiveSupport::Memoizable::InstanceMethods

### Methods

- ::memoized_ivar_for
- #memoize

### Class/Module Index

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# ActiveSupport::Memoizable

### Public Class Methods

memoized_ivar_for(symbol) click to toggle source

    # File lib/active_support/memoizable.rb, line 6
    def self.memoized_ivar_for(symbol)
      "@_memoized_#{symbol.to_s.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang')}".to_sym
    end

### Public Instance Methods

memoize(*symbols) click to toggle source

    # File lib/active_support/memoizable.rb, line 59
    def memoize(*symbols)
      symbols.each do |symbol|
        original_method = :"_unmemoized_#{symbol}"
        memoized_ivar = ActiveSupport::Memoizable.memoized_ivar_for(symbol)

        class_eval           include InstanceMethods                                                  # include InstanceMethods                                                                                   #          if method_defined?(:#{original_method})                                  # if method_defined?(:_unmemoized_mime_type)            raise "Already memoized #{symbol}"                                     #   raise "Already memoized mime_type"          end                                                                      # end          alias #{original_method} #{symbol}                                       # alias _unmemoized_mime_type mime_type                                                                                   #          if instance_method(:#{symbol}).arity == 0                                # if instance_method(:mime_type).arity == 0            def #{symbol}(reload = false)                                          #   def mime_type(reload = false)              if reload || !defined?(#{memoized_ivar}) || #{memoized_ivar}.empty?  #     if reload || !defined?(@_memoized_mime_type) || @_memoized_mime_type.empty?                #{memoized_ivar} = [#{original_method}]                            #       @_memoized_mime_type = [_unmemoized_mime_type]              end                                                                  #     end              #{memoized_ivar}[0]                                                  #     @_memoized_mime_type[0]            end                                                                    #   end          else                                                                     # else            def #{symbol}(*args)                                                   #   def mime_type(*args)              #{memoized_ivar} ||= {} unless frozen?                               #     @_memoized_mime_type ||= {} unless frozen?              reload = args.pop if args.last == true || args.last == :reload       #     reload = args.pop if args.last == true || args.last == :reload                                                                                   #              if defined?(#{memoized_ivar}) && #{memoized_ivar}                    #     if defined?(@_memoized_mime_type) && @_memoized_mime_type                if !reload && #{memoized_ivar}.has_key?(args)                      #       if !reload && @_memoized_mime_type.has_key?(args)                  #{memoized_ivar}[args]                                           #         @_memoized_mime_type[args]                elsif #{memoized_ivar}                                             #       elsif @_memoized_mime_type                  #{memoized_ivar}[args] = #{original_method}(*args)               #         @_memoized_mime_type[args] = _unmemoized_mime_type(*args)                end                                                                #       end              else                                                                 #     else                #{original_method}(*args)                                          #       _unmemoized_mime_type(*args)              end                                                                  #     end            end                                                                    #   end          end                                                                      # end                                                                                   #          if private_method_defined?(#{original_method.inspect})                   # if private_method_defined?(:_unmemoized_mime_type)            private #{symbol.inspect}                                              #   private :mime_type          elsif protected_method_defined?(#{original_method.inspect})              # elsif protected_method_defined?(:_unmemoized_mime_type)            protected #{symbol.inspect}                                            #   protected :mime_type          end                                                                      # end, __FILE__, __LINE__ + 1
      end
    end

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