Fix mapping of bigint/smallint/uuid columns in postgresql adapter.

Signed-off-by: Emilio Tagua <miloops@gmail.com>

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -23,7 +23,8 @@ module Format
       #
       # +name+ is the column's name, such as <tt>supplier_id</tt> in <tt>supplier_id int(11)</tt>.
       # +default+ is the type-casted default value, such as +new+ in <tt>sales_stage varchar(20) default 'new'</tt>.
-      # +sql_type+ is only used to extract the column's length, if necessary. For example +60+ in <tt>company_name varchar(60)</tt>.
+      # +sql_type+ is used to extract the column's length, if necessary. For example +60+ in <tt>company_name varchar(60)</tt>.
+      # It will be mapped to one of the standard Rails SQL types in the <tt>type</tt> attribute.
       # +null+ determines if this column allows +NULL+ values.
       def initialize(name, default, sql_type = nil, null = true)
         @name, @sql_type, @null = name, sql_type, null

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -114,6 +114,12 @@ def simplified_type(field_type)
             # Object identifier types
             when /^oid$/
               :integer
+            # UUID type
+            when /^uuid$/
+              :string
+            # Small and big integer types
+            when /^(?:small|big)int$/
+              :integer
             # Pass through all types that are not specific to PostgreSQL.
             else
               super