ROM 

@ilavriv

What is ROM?

Ruby object mapper, toolkit for data manipulation

1. Powerful
2. Small
3. Easy
4. No magic
5. Usable
6. Fast

Benefits to using ROM

1. Repositories
2. Relations
3. Commands
4. Mappers
5. Adapters

ROM elements

ROM Design

Using: Setup

ROM.setup(
  default: [:sql, 'sqlite::memory'],
  other: [:csv, '/path/to/files', { 
    encoding: 'utf-8', 
    col_sep: ';' 
  }]
)

Using: Relations

class BooksRelation < ROM::Relation[:sql]
  include ROM::SQL::Plugin::Pagination
  dataset :books

  per_page 30

  def ordered
    order(:id)
  end
end

Using: Commands

class CreateBook < ROM::Commands::Create[:sql]
  relation :users
  register_as :create
end

Using: Mappers

class UserAsEntity < ROM::Mapper
  register_as :entity 
  relation :users     
  model User       
end

Using: Repositories

class BookRepository < ROM::Repository::Base
  relations :book

  def new_books(timestamp)
    users.listing.added_after(timestamp)
  end
end

Adapters

• rom-sql
• rom-mongo
• rom-csv 
• ...

links

• http://rom-rb.org/
• https://github.com/rom-rb

Any questions?