Added more informative exceptions in establish_connection #356 [bitsweat]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@249 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Added more informative exceptions in establish_connection #356 [bitsweat]
+
 * Fixed that options[:counter_sql] was overwritten with interpolated sql rather than original sql #355 [bitsweat]
 
 * Fixed that overriding an attribute's accessor would be disregarded by add_on_empty and add_on_boundary_breaking because they simply used 

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -86,14 +86,13 @@ def self.establish_connection(spec = nil)
           if configuration = configurations[spec.to_s]
             establish_connection(configuration)
           else
-            raise AdapterNotSpecified
+            raise AdapterNotSpecified, "#{spec} database is not configured"
           end
         else
           spec = symbolize_strings_in_hash(spec)
-          unless spec.key?(:adapter) then raise AdapterNotSpecified end
-
+          unless spec.key?(:adapter) then raise AdapterNotSpecified, "database configuration does not specify adapter" end
           adapter_method = "#{spec[:adapter]}_connection"
-          unless respond_to?(adapter_method) then raise AdapterNotFound end
+          unless respond_to?(adapter_method) then raise AdapterNotFound, "database configuration specifies nonexistent #{spec[:adapter]} adapter" end
           remove_connection
           establish_connection(ConnectionSpecification.new(spec, adapter_method))
       end