Cloudsearchable

An ActiveRecord-style ORM query interface for Amazon CloudSearch.

Installation

Add to your Gemfile: gem 'cloudsearchable'. Run bundle or: gem install cloudsearchable.

Usage

1. Mix Cloudsearchable into your class

class Customer
  include Cloudsearchable

  attr_accessor :id, :customer, :name, :lock_version
  
  # This is the default index. You probably only need one.
  index_in_cloudsearch do |idx|
    # Fetch the customer_id field from customer
    literal :customer_id, :result_enabled => true,  :search_enabled => true, :source => Proc.new { customer }

    # Map the 'name' Ruby attribute to a field called 'test_name'
    text    :test_name,   :result_enabled => false, :search_enabled => true, :source => :name

    # uint fields can be used in result ranking functions
    uint    :helpfulness, :result_enabled => true,  :search_enabled => false do; 1234 end
  end

  # A named index.
  index_in_cloudsearch :test_index do |idx|
    literal :id,          :search_enabled => true
  end
end

2. Index some objects

c = Customer.new
c.add_to_indexes
c.update_indexes
c.remove_from_indexes

3. Start querying

Customer.search.where(customer_id: 12345)
Customer.search.where(customer_id: 12345).order('-helpfulness')  # ordering
Customer.search.where(customer_id: 12345).limit(10)              # limit, default 100000
Customer.search.where(customer_id: 12345).offset(100)            # offset
Customer.search.where(customer_id: 12345).found_count            # count

Customer.search.where(customer_id: 12345).where(helpfulness: 42) # query chain
Customer.search.where(customer_id: 12345, helpfulness: 42)       # query chain from hash
Customer.search.where(:category, :any, ["big", "small"])         # multiple values
Customer.search.where(:customer_id, :!=, 1234)                   # "not equal to" operator
Customer.search.text('test')                                     # text search
Customer.search.text('test').where(:featured, :==, 'f')          # text search with other fields

Customer.search.where(:helpfulness, :within_range, 0..123)       # uint range query, string range works too
Customer.search.where(:helpfulness, :>, 123)                     # uint greather than
Customer.search.where(:helpfulness, :>=, 123)                    # uint greather than or equal to
Customer.search.where(:helpfulness, :<, 123)                     # uint less than
Customer.search.where(:helpfulness, :<=, 123)                    # uint less than or equal to

These queries return a Cloudsearchable::Query, calling .to_a or .found_count will fetch the results

Customer.search.where(customer_id: 12345).each |customer|
  p "#{customer.class}: #{customer.name}"
end
# Customer: foo
# Customer: bar

Configuration

# config\initializers\cloudsearchable_config.rb

require 'cloudsearchable'

Cloudsearchable.configure do |config|
  config.domain_prefix = "dev-lane-"
end

Supported Options

• domain_prefix - A name prefix string for your domains in CloudSearch. Defaults to Rails.env, or "" if Rails is undefined.
• config.fatal_warnings - raises WarningInQueryResult exception on warning. Defaults to false.
• config.logger - a custom logger, defaults to Rails if defined.

ActiveSupport Notifications

Requests to AWS cloudsearch are instrumented using ActiveSupport Notifications. To consume these instrumented events register a subscriber in your Application. For example, to register for getting notifications for search requests:

  ActiveSupport::Notifications.subscribe('cloudsearchable.execute_query') do |*args|
    event = ActiveSupport::Notifications::Event.new(*args)
    # Your code here ...
  end

Instrumented events:

1. cloudsearchable.execute_query - Instruments search requests
2. cloudsearchable.post_record - Instruments record addition
3. cloudsearchable.delete_record - Instruments record deletion
4. cloudsearchable.describe_domains - Instruments request for getting domains information

Other Features

Cloudsearchable provides access the underlying AWS client objects, such as '''CloudSearch.client''' and '''class.cloudsearch_domains'''. For example here is how to drop domains associated with Customer class:

  client = CloudSearch.client
  Customer.cloudsearch_domains.each do |key, domain|
    domain_name = domain.name
    puts "...dropping #{domain_name}"
    client.delete_domain(:domain_name => domain_name)
  end

See spec tests and source code for more information.

Credits

• Logan Bowers
• Peter Abrahamsen
• Lane LaRue
• Philip White

Apache 2.0 License

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Run the tests (rake spec)
4. Commit your changes (git commit -am 'Add some feature')
5. Push to the branch (git push origin my-new-feature)
6. Create new Pull Request