ievgrafov

module A
  def a
    puts 'A'
  end  
end  

module B
  def a
    puts 'B'
  end  

ievgrafov

class Formula
  attr_accessor :value

  def initialize(v)
    @value = v
  end

  def to_s
    value
  end

ievgrafov

# A monkey-patch that allows you to use comma as decimal separator in ActiveRecord
# Notice for rails 5.0: in Rails 5.0 module Type with all nested classes is moved into ActiveModel,
# so don't forget to substitute 'module ActiveRecord' with 'module ActiveModel' after update
module ActiveRecord
  module Type
    class Decimal
      private

        alias_method :cast_value_without_comma_separator, :cast_value

ievgrafov

Запрос через IN:
SELECT "documents".* FROM "documents" 
WHERE "documents"."archived_at" IS NULL 
  AND (
    contractor_id IN (SELECT id FROM companies WHERE lower(COALESCE(companies.title, '')) ~* 'основ')
    OR stock_to_id IN (SELECT id FROM stocks WHERE lower(COALESCE(stocks.title, '')) ~* 'основ')
    OR stock_from_id IN (SELECT id FROM stocks WHERE lower(COALESCE(stocks.title, '')) ~* 'основ')
  );
EXPLAIN ANALYZE:
>> Append  (cost=135.96..2696.11 rows=3680 width=291) (actual time=4.539..52.993 rows=1940 loops=1)

ievgrafov

def generic_restriction(method_name, attributes)
  [:define_method, :define_singleton_method].each do |definition_method|
    send definition_method, method_name do
      attributes
    end
  end
end

ievgrafov

x0 = (0..500).map{ |xx| xx/1000.0 }
y0 = x0.map{ |xx| Math.exp(-xx) }
x1 = (500..1000).map{ |xx| xx/1000.0 }
y1 = x1.map{ |xx| Math.exp(-xx) }

# create new datablock
datablock = Datablock.new([x0, y0])

# now data will be sent to gnuplot and new datablock in terminal created
# everything is good, we still may have stateless objects