models for an api that returns search results for terms from different search engines/apis.

search_engine.rb

class SearchEngine < ActiveRecord::Base
  has_and_belongs_to_many :terms
  has_many :searches, through: :terms
end

class Term < ActiveRecord::Base
  has_and_belongs_to_many :searches
  has_and_belongs_to_many :searche_engines
end

class Result < ActiveRecord::Base
  belongs_to :source
  has_many :rankings
  has_many :searches, through: :rankings
end

class Source < ActiveRecord::Base
  has_many :results
end

class Ranking < ActiveRecord::Base
  belongs_to :search
  belongs_to :result
end

class Search < ActiveRecord::Base
  has_many :rankings
  has_many :results, through: :rankings
  has_and_belongs_to_many :terms
  has_many :search_engines, through :terms
end