solnic

require 'equalizer'

module Checkproc
  InvalidValueError = Class.new(StandardError) { include Equalizer.new(:message) }

  class Composite
    attr_reader :left
    attr_reader :right

    def initialize(left, right)

solnic

Calculating -------------------------------------
              method    97.664k i/100ms
                proc    85.151k i/100ms
-------------------------------------------------
              method      2.611M (± 3.7%) i/s -     13.087M
                proc      1.910M (± 3.4%) i/s -      9.537M

Comparison:
              method:  2611065.1 i/s
                proc:  1909549.3 i/s - 1.37x slower

solnic

require 'transproc'

include Transproc::Helper

def source_fn(source)
  t(:add_keys, [:source]) >> t(:map_array, t(:map_value, :source, proc { source }))
end

fb_source = source_fn(:facebook)
tw_source = source_fn(:twitter)

solnic

require 'rom'
require 'transproc'

module Transformations
  extend Transproc::Functions

  def eval_keys(hash, param)
    hash.each_with_object(Hash[hash]) do |(key, value), copy|
      copy[key] =
        case value

solnic

require 'rom'
require 'byebug'

rom = ROM.setup(:memory) do
  relation(:users)
  relation(:tasks)
  relation(:tags)

  commands(:users) do
    define(:create) do

solnic

require "rom/memory"

memory_repo = ROM::Memory::Repository.new
user_dataset = memory_repo.dataset(:users)

class Users < ROM::Relation[:memory]
end

class UserMapper < ROM::Mapper
  model name: 'UserEntity' # ROM supports generating model classes

solnic

require 'rom'

require 'rom/support/options'
require 'rom/support/data_proxy'

class MyDataset
  include ROM::Options
  include ROM::DataProxy

  option :connection, reader: true

solnic

require 'rom'

Batman = Struct.new(:secret_name)

Transproc.register(:to_batman, proc { |name| Batman.new(name) })

class GothamCityMapper < ROM::Mapper
  attribute :superhero, type: :batman
end

solnic

require 'active_record'
require 'hotch'

ActiveRecord::Base.establish_connection('postgresql://localhost/rom')

class User < ActiveRecord::Base
end

User.delete_all

solnic

require 'rom'
require 'rspec'

module ROM
  class Relation
    class Composite
      attr_reader :left, :right

      def initialize(left, right)
        @left = left