DEV: Update data explorer queries to new table if exists (#197)

db/post_migrate/20240717071658_update_data_explorer_topic_voting_queries.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class UpdateDataExplorerTopicVotingQueries < ActiveRecord::Migration[7.0]
+  def up
+    has_data_explorer_queries = DB.query_single(<<~SQL).first
+      SELECT EXISTS (
+        SELECT FROM information_schema.tables
+        WHERE table_name = 'data_explorer_queries'
+      );
+    SQL
+
+    DB.exec(<<~SQL) if has_data_explorer_queries
+        UPDATE data_explorer_queries
+        SET sql = REPLACE(
+          REPLACE(sql, 'discourse_voting_topic_vote_count', 'topic_voting_topic_vote_count'),
+          'discourse_voting_votes', 'topic_voting_votes'
+        )
+        WHERE sql LIKE '%discourse_voting_topic_vote_count%'
+           OR sql LIKE '%discourse_voting_votes%';
+      SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end