ODBA with a condition Index

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 #!/usr/bin/env ruby

 require 'odba'
 require 'odba/index_definition'

 class User
  attr_accessor :first_name, :last_name, :year_of_birth
  include ODBA::Persistable
  def initialize(first_name, last_name, yob)
    @first_name = first_name
    @last_name = last_name
    @year_of_birth = yob
  end
  def to_s
    "#@first_name #@last_name"
  end
 end

 index_def = YAML.load <<-EOD
 --- !ruby/object:ODBA::IndexDefinition
 index_name: 'users'
 origin_klass: 'User'
 target_klass: 'User'
 resolve_search_term:
  lastname:
   resolve: 'last_name'
   type: varchar(20)
  firstname:
   resolve: 'first_name'
  year:
   type: integer
   resolve: year_of_birth
 resolve_target: ''
 resolve_origin: ''
 EOD

 ODBA.storage.dbi = DBI.connect('DBI:pg:test', 'test', '')
 ODBA.cache.setup
 begin
   ODBA.cache.drop_index('users')
 rescue
 end
 ODBA.cache.create_index(index_def, Object)

 father = User.new('Johann Sebastian', 'Bach', 1685)
 father.odba_store
 son = User.new('Carl Philipp Emanuel', 'Bach', 1714)
 son.odba_store

 conditions = {
   'lastname' => {
     'value' => 'Bach',
   }
 }
 puts ODBA.cache.retrieve_from_index('users', conditions)

 # -> Carl Philipp Emanuel Bach
 #    Johann Sebastian Bach


 conditions = {
   'lastname' => {
     'value' => 'Bach',
   },
   'firstname' => {
     'value' => 'Carl',
     'condition' => 'like',
   }
 }

 # -> Carl Philipp Emanuel Bach


 puts ODBA.cache.retrieve_from_index('users', conditions)
 conditions = {
   'lastname' => {
     'value' => 'Bach',
   },
   'year' => {
     'value' => 1700,
     'condition' => '<',
   }
 }
 puts ODBA.cache.retrieve_from_index('users', conditions)

 # -> Johann Sebastian Bach