Add replica? check to DatabaseConfig

Checks if the config has a "replica" key, if so the configuration is for
a replica database. This is useful for excluding replicas from the
configurations list when creating the rake tasks or running rake tasks.
For example, we don't want to create the primary and primary_readonly.
They're the same database.

3 files changed, 12 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/database_configurations/database_config.rb b/activerecord/lib/active_record/database_configurations/database_config.rb
index 4a58115cd5..6250827b34 100644
--- a/activerecord/lib/active_record/database_configurations/database_config.rb
+++ b/activerecord/lib/active_record/database_configurations/database_config.rb
@@ -13,6 +13,10 @@ module ActiveRecord
         @spec_name = spec_name
       end
 
+      def replica?
+        raise NotImplementedError
+      end
+
       def url_config?
         false
       end
diff --git a/activerecord/lib/active_record/database_configurations/hash_config.rb b/activerecord/lib/active_record/database_configurations/hash_config.rb
index 2ee218c730..249107ebeb 100644
--- a/activerecord/lib/active_record/database_configurations/hash_config.rb
+++ b/activerecord/lib/active_record/database_configurations/hash_config.rb
@@ -31,6 +31,10 @@ module ActiveRecord
         super(env_name, spec_name)
         @config = config
       end
+
+      def replica?
+        config["replica"]
+      end
     end
   end
 end
diff --git a/activerecord/lib/active_record/database_configurations/url_config.rb b/activerecord/lib/active_record/database_configurations/url_config.rb
index c3d9798c37..181f04c3fd 100644
--- a/activerecord/lib/active_record/database_configurations/url_config.rb
+++ b/activerecord/lib/active_record/database_configurations/url_config.rb
@@ -41,6 +41,10 @@ module ActiveRecord
         true
       end
 
+      def replica?
+        config["replica"]
+      end
+
       private
         def build_config(original_config, url)
           if /^jdbc:/.match?(url)