Make sure the wrapped exceptions also have the original exception ava…

…ilable.

[#2419 state:committed]

activerecord/lib/active_record/base.rb

@@ -67,12 +67,23 @@ class RecordNotSaved < ActiveRecordError
   class StatementInvalid < ActiveRecordError
   end
 
+  # Parent class for all specific exceptions which wrap database driver exceptions
+  # provides access to the original exception also.
+  class WrappedDatabaseException < StatementInvalid
+    attr_reader :original_exception
+
+    def initialize(message, original_exception)
+      super(message)
+      @original_exception, = original_exception
+    end
+  end
+
   # Raised when a record cannot be inserted because it would violate a uniqueness constraint.
-  class RecordNotUnique < StatementInvalid
+  class RecordNotUnique < WrappedDatabaseException
   end
 
   # Raised when a record cannot be inserted or updated because it references a non-existent record.
-  class InvalidForeignKey < StatementInvalid
+  class InvalidForeignKey < WrappedDatabaseException
   end
 
   # Raised when number of bind variables in statement given to <tt>:condition</tt> key (for example, when using +find+ method)

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -568,9 +568,9 @@ def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
         def translate_exception(exception, message)
           case exception.errno
           when 1062
-            RecordNotUnique.new(message)
+            RecordNotUnique.new(message, exception)
           when 1452
-            InvalidForeignKey.new(message)
+            InvalidForeignKey.new(message, exception)
           else
             super
           end

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -944,9 +944,9 @@ def postgresql_version
         def translate_exception(exception, message)
           case exception.message
           when /duplicate key value violates unique constraint/
-            RecordNotUnique.new(message)
+            RecordNotUnique.new(message, exception)
           when /violates foreign key constraint/
-            InvalidForeignKey.new(message)
+            InvalidForeignKey.new(message, exception)
           else
             super
           end

activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb

@@ -435,7 +435,7 @@ def default_primary_key_type
         def translate_exception(exception, message)
           case exception.message
           when /column(s)? .* (is|are) not unique/
-            RecordNotUnique.new(message)
+            RecordNotUnique.new(message, exception)
           else
             super
           end