Extend relation to switch "enable_seqscan" around query execution

yoshuki · Nov 2, 2016 · 049c8d4 · 049c8d4
1 parent 5f53f5d
commit 049c8d4
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diff --git a/app/models/article.rb b/app/models/article.rb
@@ -5,6 +5,7 @@ class Article < ApplicationRecord
     articles = select("#{quoted_table_name}.*, pgroonga.score(#{quoted_table_name}) AS pgroonga_score")
                .where("title #{operator} ? OR body #{operator} ?", query, query)
                .reorder('pgroonga_score DESC')
+               .extending(DisableSequentialScan)
 
     return articles unless highlight
 

diff --git a/app/models/concerns/disable_sequential_scan.rb b/app/models/concerns/disable_sequential_scan.rb
@@ -0,0 +1,8 @@
+module DisableSequentialScan
+  def exec_queries
+    @klass.connection.exec_query('SET enable_seqscan TO off')
+    super
+  ensure
+    @klass.connection.exec_query('SET enable_seqscan TO on')
+  end
+end