Fix not actually connecting to the configured replica (#25977)

app/helpers/database_helper.rb

@@ -2,10 +2,10 @@
 
 module DatabaseHelper
   def with_read_replica(&block)
-    ApplicationRecord.connected_to(role: :read, prevent_writes: true, &block)
+    ApplicationRecord.connected_to(role: :reading, prevent_writes: true, &block)
   end
 
   def with_primary(&block)
-    ApplicationRecord.connected_to(role: :primary, &block)
+    ApplicationRecord.connected_to(role: :writing, &block)
   end
 end

app/models/application_record.rb

@@ -5,6 +5,8 @@ class ApplicationRecord < ActiveRecord::Base
 
   include Remotable
 
+  connects_to database: { writing: :primary, reading: :read }
+
   class << self
     def update_index(_type_name, *_args, &_block)
       super if Chewy.enabled?