Add config option for `replica`.

This allows the user to add `replica: true` to the database config to
signify the connection should be treated as readonly. This will be
useful so we can ignore structure dumps or migrations (or creating /
deleting etc) the readonly connection for the databases. These are
paired with a write database which is where the create/drop/migrate
should be run. This allows us to ask the connection if it's for a
replica readonly db or a primary write db.

1 files changed, 4 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 8999d3232a..a62651daff 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -127,6 +127,10 @@ module ActiveRecord
         )
       end
 
+      def replica?
+        @config[:replica] || false
+      end
+
       def migrations_paths # :nodoc:
         @config[:migrations_paths] || Migrator.migrations_paths
       end