Do not expect database user with app name to exist

railties/lib/rails/generators/rails/app/templates/config/databases/jdbcpostgresql.yml

@@ -6,13 +6,20 @@
 default: &default
   adapter: postgresql
   encoding: unicode
-  username: <%= app_name %>
-  password:
 
 development:
   <<: *default
   database: <%= app_name %>_development
 
+  # The specified database role being used to connect to postgres.
+  # To create additional roles in postgres see `$ createuser --help`.
+  # When left blank, postgres will use the default role. This is
+  # the same name as the operating system user that initialized the database.
+  #username: <%= app_name %>
+
+  # The password associated with the postgres role (username).
+  #password:
+
   # Connect on a TCP socket. Omitted by default since the client uses a
   # domain socket that doesn't need configuration. Windows does not have
   # domain sockets, so uncomment these lines.

railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml

@@ -20,13 +20,20 @@ default: &default
   # For details on connection pooling, see rails configuration guide
   # http://guides.rubyonrails.org/configuring.html#database-pooling
   pool: 5
-  username: <%= app_name %>
-  password:
 
 development:
   <<: *default
   database: <%= app_name %>_development
 
+  # The specified database role being used to connect to postgres.
+  # To create additional roles in postgres see `$ createuser --help`.
+  # When left blank, postgres will use the default role. This is
+  # the same name as the operating system user that initialized the database.
+  #username: <%= app_name %>
+
+  # The password associated with the postgres role (username).
+  #password:
+
   # Connect on a TCP socket. Omitted by default since the client uses a
   # domain socket that doesn't need configuration. Windows does not have
   # domain sockets, so uncomment these lines.