Module: Cerealize::ClassMethods

Defined in:
lib/cerealize.rb,
lib/cerealize/attr_hash.rb

Instance Method Summary collapse

Instance Method Details

#attr_hash(property, attrs) ⇒ Object 



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# File 'lib/cerealize/attr_hash.rb', line 4

def attr_hash property, attrs
  ruby = attrs.inject([]){ |codes, attr|
    codes << "      def \#{attr}\n        if \#{property}\n          \#{property}[:\#{attr}]\n        else\n          nil\n        end\n      end\n\n      def \#{attr}= value\n        self.\#{property} ||= {}\n\n        # this line fixes the quirks in ActiveRecord 2.3.9 at\n        # activerecord-2.3.9/lib/active_record/associations/association_collection.rb:L352-L363\n        # when we're using associations and STI, thanks Jaime\n        # TODO: test for this?\n        \#{property}_will_change! if\n          respond_to?(:\#{property}_will_change!) &&\n          \#{property}[:\#{attr}] != value\n\n        \#{property}[:\#{attr}] = value\n      end\n    RUBY\n  }.join(\"\\n\")\n\n  mod = if const_defined?(Cerealize::InternalName)\n          const_get(Cerealize::InternalName)\n        else\n          const_set(Cerealize::InternalName, Module.new)\n        end\n\n  mod.module_eval(ruby, __FILE__, __LINE__)\n  include mod unless self < mod\nend\n"

#cerealize(property, klass = nil, opt = {}) ⇒ Object 



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# File 'lib/cerealize.rb', line 88

def cerealize property, klass=nil, opt={}
  opt[:encoding] ||= :marshal
  cerealize_option[property] =
    opt.merge(:class => klass,
              :codec => Cerealize.codec_get(opt[:encoding]))

  field_orig  = "#{property}_orig"
  field_cache = "#{property}_cache"

  attr_accessor field_orig
  private field_orig, "#{field_orig}="

  mod = if const_defined?(Cerealize::InternalName)
          const_get(Cerealize::InternalName)
        else
          const_set(Cerealize::InternalName, Module.new)
        end

  mod.module_eval "    def \#{field_cache}\n      if defined?(@\#{property})\n        @\#{property}\n      else\n        # define @\#{property} to avoid mutual recursion\n        @\#{property} = nil\n        @\#{property} = \#{property}\n      end\n    end\n\n    def \#{field_cache}=(new_value)\n      @\#{property} = new_value\n    end\n  RUBY\n\n  # Invariants:\n  #   - instance_variable_defined?(field_cache)  IFF the READER or WRITER has been called\n  #   - instance_variable_defined?(field_pre)    IFF the READER was called BEFORE\n  #                                              any WRITER\n\n  # READER method\n  #\n  mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1\n    def \#{property}\n      # Return cached\n      return \#{field_cache} if defined?(@\#{property}) && \#{field_cache}\n\n      # No assignment yet, save property if not already saved\n      self.\#{field_orig}= self[:\#{property}] if !\#{field_orig}\n\n      # Set cached from pre\n      value = cerealize_decode(:\#{property}, \#{field_orig})\n\n      raise ActiveRecord::SerializationTypeMismatch, \"expected \#{klass}, got \\\#{value.class}\" \\\\\n        if \#{klass.inspect} && !value.nil? && !value.kind_of?(\#{klass})\n\n      self.\#{field_cache} = value\n    end\n  RUBY\n\n  # WRITER method\n  #\n  mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1\n    def \#{property}=(value)\n      \#{property}_will_change! if \#{field_cache} != value\n      self.\#{field_cache} = value\n    end\n  RUBY\n\n  # Callback for before_save\n  #\n  mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1\n    def \#{property}_update_if_dirty\n      # See if we have a new cur value\n      if instance_variable_defined?('@\#{property}')\n        value     = \#{field_cache}\n        value_enc = cerealize_encode(:\#{property}, value)\n\n        # See if no orig at all (i.e. it was written to before\n        # being read), or if different. When comparing, compare\n        # both marshalized string, and Object ==.\n        #\n        if !\#{field_orig} ||\n          (value_enc != \#{field_orig} &&\n           value     != cerealize_decode(:\#{property}, \#{field_orig}))\n          self[:\#{property}] = value_enc\n        end\n\n        remove_instance_variable('@\#{property}')\n      end\n\n      self.\#{field_orig} = nil\n    end\n  RUBY\n\n  include mod unless self < mod\n  before_save(\"\#{property}_update_if_dirty\")\nend\n", __FILE__, __LINE__ + 1

#cerealize_update_codec_cache ⇒ Object 



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# File 'lib/cerealize.rb', line 82

def cerealize_update_codec_cache
  cerealize_option.each{ |(property, opt)|
    opt.merge!(:codec => Cerealize.codec_get(opt[:encoding]))
  }
end