Framework integration / Rails / Configuration & Relevance

Replicas and multiple indices

A

Replica indices# A

Algolia uses one ranking strategy per index. If you want to provide more ranking or sorting strategies, add replica indices with the add_replica method. To inherit the settings from the primary index, add inherit:true.

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class Book < ActiveRecord::Base
  attr_protected

  include AlgoliaSearch

  algoliasearch per_environment: true do
    searchableAttributes [:name, :author, :editor]

    # Define a replica index to search by `author` only
    add_replica 'Book_by_author', per_environment: true do
      searchableAttributes [:author]
    end

    # define a replica index with custom ordering but same settings than the main block
    add_replica 'Book_custom_order', inherit: true, per_environment: true do
      customRanking ['asc(rank)']
    end
  end

end

Share a single index# A

If you want to share an index for multiple models, make sure that your objectIDs are unique. For example, you can prepend the model class name to the record’s id:

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class Student < ActiveRecord::Base
  attr_protected

  include AlgoliaSearch

  algoliasearch index_name: 'people', id: :algolia_id do
    # [...]
  end

  private
  def algolia_id
    "student_#{id}" # ensure the teacher & student IDs are not conflicting
  end
end

class Teacher < ActiveRecord::Base
  attr_protected

  include AlgoliaSearch

  algoliasearch index_name: 'people', id: :algolia_id do
    # [...]
  end

  private
  def algolia_id
    "teacher_#{id}" # ensure the teacher & student IDs are not conflicting
  end
end

To reindex a model that’s part of a shared index, you must use Model.reindex! instead of Model.reindex. If you use reindex, the resulting index would only contain records for the current model. For more information, see Zero-downtime indexing

Target multiple indices# A

To index records in several indices, use the add_index method.

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class Book < ActiveRecord::Base
  attr_protected

  include AlgoliaSearch

  PUBLIC_INDEX_NAME  = "Book_#{Rails.env}"
  SECURED_INDEX_NAME = "SecuredBook_#{Rails.env}"

  # store all books in index 'SECURED_INDEX_NAME'
  algoliasearch index_name: SECURED_INDEX_NAME do
    searchableAttributes [:name, :author]
    # convert security to tags
    tags do
      [released ? 'public' : 'private', premium ? 'premium' : 'standard']
    end

    # store all 'public' (released and not premium) books in index 'PUBLIC_INDEX_NAME'
    add_index PUBLIC_INDEX_NAME, if: :public? do
      searchableAttributes [:name, :author]
    end
  end

  private
  def public?
    released && !premium
  end

end
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