Module: ActiveFlag::ClassMethods

Defined in:
lib/active_flag.rb

Instance Method Summary collapse

Instance Method Details

#flag(column, keys) ⇒ Object 



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# File 'lib/active_flag.rb', line 11

def flag(column, keys)
  unless respond_to?(:active_flags)
    class_attribute :active_flags
    self.active_flags = {}
  end

  raise "active_flags on :#{column} already defined!" if active_flags[column]

  self.active_flags[column] = Definition.new(column, keys, self)

  # Getter
  define_method column do
    self.class.active_flags[column].to_value(self, read_attribute(column).to_i)
  end

  # Setter
  define_method "#{column}=" do |arg|
    write_attribute column, self.class.active_flags[column].to_i(arg)
  end

  # Reference to definition
  relation_method_name = column.to_s.pluralize
  define_singleton_method relation_method_name do
    active_flags[column]
  end

  if respond_to?(:generated_relation_methods, true)
    unless relation_method_conflict?(relation_method_name)
      send(:generated_relation_methods).module_eval do
        define_method relation_method_name do
          klass.active_flags[column].with_scope(self)
        end
      end
    end
  end


  # Scopes
  define_singleton_method "where_#{column}" do |*args|
    integer, column_name = send("_where_#{column}", *args)
    where("#{column_name} & #{integer} > 0")
  end

  define_singleton_method "where_all_#{column}" do |*args|
    integer, column_name = send("_where_#{column}", *args)
    where("#{column_name} & #{integer} = #{integer}")
  end

  define_singleton_method "where_not_#{column}" do |*args|
    integer, column_name = send("_where_#{column}", *args)
    where("#{column_name} & #{integer} = 0")
  end

  define_singleton_method "where_not_all_#{column}" do |*args|
    integer, column_name = send("_where_#{column}", *args)
    where("#{column_name} & #{integer} < #{integer}")
  end

  # utility method to extract parameters
  define_singleton_method "_where_#{column}" do |*args|
    return [
      active_flags[column].to_i(args),
      "#{connection.quote_table_name(table_name)}.#{connection.quote_column_name(column)}"
    ]
  end
end