1 files changed, 13 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/tasks/database_tasks.rb b/activerecord/lib/active_record/tasks/database_tasks.rb
index aecc9350e8..300e67b0aa 100644
--- a/activerecord/lib/active_record/tasks/database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/database_tasks.rb
@@ -4,7 +4,6 @@ require "active_record/database_configurations"
 
 module ActiveRecord
   module Tasks # :nodoc:
-    class DatabaseAlreadyExists < StandardError; end # :nodoc:
     class DatabaseNotSupported < StandardError; end # :nodoc:
 
     # ActiveRecord::Tasks::DatabaseTasks is a utility class, which encapsulates
@@ -141,10 +140,21 @@ module ActiveRecord
         end
       end
 
-      def for_each
+      def setup_initial_database_yaml
+        return {} unless defined?(Rails)
+
+        begin
+          Rails.application.config.load_database_yaml
+        rescue
+          $stderr.puts "Rails couldn't infer whether you are using multiple databases from your database.yml and can't generate the tasks for the non-primary databases. If you'd like to use this feature, please simplify your ERB."
+
+          {}
+        end
+      end
+
+      def for_each(databases)
         return {} unless defined?(Rails)
 
-        databases = Rails.application.config.load_database_yaml
         database_configs = ActiveRecord::DatabaseConfigurations.new(databases).configs_for(env_name: Rails.env)
 
         # if this is a single database application we don't want tasks for each primary database