Module: Freezer::ActiveRecordExtensions::ClassMethods

Defined in:
lib/freezer/active_record_extensions.rb

Instance Method Summary collapse

Instance Method Details

#has_one_frozen(association_name, options = {}) ⇒ Object 



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# File 'lib/freezer/active_record_extensions.rb', line 10

def has_one_frozen(association_name, options = {})
  options.reverse_merge!({
    class_name: association_name.to_s,
    column_name: "frozen_#{association_name.to_s}",
    slient: false
  })

  klass = options[:class_name]
  klass = klass.to_s.camelize.constantize unless Class === klass
  accessor_name = association_name.to_s.underscore
  serializer = if self.columns_hash[options[:column_name].to_s].type == :hstore
    require 'freezer/serialization/hstore'
    ::Freezer::Serialization::HStore
  else
    require 'freezer/serialization/serialize'
    self.serialize options[:column_name].to_sym, Hash
    ::Freezer::Serialization::Serialize
  end

  # Reader
  define_method(accessor_name) do
    @freezer_cache ||= {}

    if @freezer_cache.key? accessor_name
      return @freezer_cache[accessor_name]
    end

    # On cache miss, try to read from the raw accessor
    if hstore = read_attribute(options[:column_name])
      @freezer_cache[accessor_name] = serializer.deserialize(options[:class_name], hstore, options[:slient])
    else
      @freezer_cache[accessor_name] = nil
    end

    @freezer_cache[accessor_name]
  end

  # Writer
  define_method("#{accessor_name}=") do |record|
    unless record.nil? || record.is_a?(klass)
      message = "#{klass}(##{klass.object_id}) expected, got #{record.class}(##{record.class.object_id})"
      raise ArgumentError, message
    end

    @freezer_cache ||= {}

    if record
      write_attribute(options[:column_name], serializer.serialize(record))
    else
      write_attribute(options[:column_name], nil)
    end

    @freezer_cache.delete(accessor_name)

    # Return the frozen copy of record by calling the reader
    self.__send__(accessor_name.to_sym)
  end
end