MindReader: Easy searching for ActiveRecord applications¶ ↑

Given the following objects:

@robin = Customer.create! :name => 'Damian Wayne',
                          :address => 'Wayne Manor, Gotham City',
                          :age => 14
@batman = Customer.create! :name => 'Dick Grayson',
                           :address => 'Wayne Manor, Gotham City',
                           :sidekick_id => @robin.id,
                           :age => 26
@superman = Customer.create! :name => 'Kal-El',
                             :address => 'Kandor, New Krypton',
                             :age => 36

Find by one field:

reader = MindReader.new(Customer)
result = reader.execute(:address => 'Wayne Manor, Gotham City')
result.should have(2).bat_heroes
result.should include(@batman, @robin)

Find by multiple fields:

reader = MindReader.new(Customer)
reader.execute(:address => 'Wayne Manor, Gotham City',
  :name => 'Dick Grayson').should == [@batman]

String fields are evaluated partially:

result = reader.execute(:name => 'ay')
result.should have(2).super_heroes
result.should include(@batman, @robin)

Find with lookup:

reader = MindReader.new(Customer) do |r|
  r.sidekick_id(:lookup => :sidekick_name) {|name| Customer.find_by_name(name).id }
end
reader.execute(:sidekick_name => 'Damian Wayne').should == [@batman]

Find given a range:

reader = MindReader.new(Customer) do |r|
  r.age :range => :start_age..:end_age
end
reader.execute('start_age' => 25, 'end_age' => 36).should == [@batman, @superman]

Blank fields are ignored:

reader = MindReader.new(Customer)
reader.execute(:name => 'Kal-El', :address => '').should == [@superman]

If all fields are blank, returns nil:

reader = MindReader.new(Customer)
reader.execute(:name => '', :address => '').should be_nil

unless you say you want all objects:

reader = MindReader.new(Customer)
reader.retrieve_all_when_no_value_is_given = true
result = reader.execute(:name => '', :address => '')
result.should have(3).super_heroes
result.should include(@batman, @robin, @superman)

mind_reader supports converters for incoming data. For sake of example, imagine you have to enter a date in a different format (here, dd/mm/yyyy), and you want to convert it to default yyyy-mm-dd:

def convert_to_default(br_date)
  br_date =~ /(\d+)\/(\d+)\/(\d+)/
  "%s-%s-%s" % [$3, $2, $1]
end

reader = MindReader.new(SuperHero) do |r|
  r.date_of_heroic_birth :range => :from_date..:to_date, :converter => lambda {|d| convert_to_default(d) }
end
reader.execute('from_date' => '01/04/2010', 'to_date' => '30/04/2010').should == [@batman]

$ gem install mind_reader

$ rake spec

Copyright © 2011 Rodrigo Manhães. See LICENSE.txt for further details.