Change minimum (default) log level in PostgreSQL to warning.

activerecord/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   PostgreSQL default log level is now 'warning', to bypass the noisy notice
+    messages. You can change the log level using the `min_messages` option
+    available in your config/database.yml.
+
+    *kennyj*
+
 *   Add uuid datatype support to PostgreSQL adapter. *Konstantin Shabanov*
 
 *   `update_attribute` has been removed. Use `update_column` if

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -1450,7 +1450,7 @@ def configure_connection
           if @config[:encoding]
             @connection.set_client_encoding(@config[:encoding])
           end
-          self.client_min_messages = @config[:min_messages] if @config[:min_messages]
+          self.client_min_messages = @config[:min_messages] || 'warning'
           self.schema_search_path = @config[:schema_search_path] || @config[:schema_order]
 
           # Use standard-conforming strings if available so we don't have to do the E'...' dance.

activerecord/test/cases/adapters/postgresql/connection_test.rb

@@ -21,6 +21,10 @@ def test_encoding
       assert_not_nil @connection.encoding
     end
 
+    def test_default_client_min_messages
+      assert_equal "warning", @connection.client_min_messages
+    end
+
     # Ensure, we can set connection params using the example of Generic
     # Query Optimizer (geqo). It is 'on' per default.
     def test_connection_options

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

@@ -22,8 +22,8 @@ development:
   # Minimum log levels, in increasing order:
   #   debug5, debug4, debug3, debug2, debug1,
   #   log, notice, warning, error, fatal, and panic
-  # The server defaults to notice.
-  #min_messages: warning
+  # Defaults to warning.
+  #min_messages: notice
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".

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

@@ -35,8 +35,8 @@ development:
   # Minimum log levels, in increasing order:
   #   debug5, debug4, debug3, debug2, debug1,
   #   log, notice, warning, error, fatal, and panic
-  # The server defaults to notice.
-  #min_messages: warning
+  # Defaults to warning.
+  #min_messages: notice
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".