Merge pull request #139 from alphagov/boosts-refactor

Refactor boost specs for `DiscoveryEngine::Search`

app/services/discovery_engine/boosts/best_bets.rb

@@ -0,0 +1,28 @@
+module DiscoveryEngine::Boosts
+  class BestBets
+    def initialize(query_string)
+      @query_string = query_string
+    end
+
+    def boost_specs
+      return unless best_bets_for_query.any?
+
+      [{
+        boost: 1,
+        condition: "link: ANY(#{condition_links})",
+      }]
+    end
+
+  private
+
+    attr_reader :query_string
+
+    def best_bets_for_query
+      Array(Rails.configuration.best_bets[query_string])
+    end
+
+    def condition_links
+      best_bets_for_query.map { "\"#{_1}\"" }.join(",")
+    end
+  end
+end

app/services/discovery_engine/news_recency_boost.rb → app/services/discovery_engine/boosts/news_recency.rb

@@ -1,11 +1,11 @@
-module DiscoveryEngine
-  module NewsRecencyBoost
+module DiscoveryEngine::Boosts
+  class NewsRecency
     FRESH_AGE = 1.week
     RECENT_AGE = 3.months
     OLD_AGE = 1.year
     ANCIENT_AGE = 4.years
 
-    def news_recency_boost_specs
+    def boost_specs
       [
         {
           boost: 0.2,

app/services/discovery_engine/search.rb

@@ -3,9 +3,6 @@ class Search
     DEFAULT_PAGE_SIZE = 10
     DEFAULT_OFFSET = 0
 
-    include BestBetsBoost
-    include NewsRecencyBoost
-
     def initialize(
       query_params,
       client: ::Google::Cloud::DiscoveryEngine.search_service(version: :v1)
@@ -53,8 +50,8 @@ def serving_config
     def boost_spec
       {
         condition_boost_specs: [
-          *news_recency_boost_specs,
-          *best_bets_boost_specs(query),
+          *Boosts::NewsRecency.new.boost_specs,
+          *Boosts::BestBets.new(query).boost_specs,
         ],
       }
     end