From b5dfdc714fab7d2836e0a979ca88b4a17db9ec06 Mon Sep 17 00:00:00 2001
From: Michael Koziarski <michael@koziarski.com>
Date: Fri, 26 Jun 2009 16:59:27 +1200
Subject: Make sure the wrapped exceptions also have the original exception
 available.

[#2419 state:committed]
---
 activerecord/lib/active_record/base.rb                    | 15 +++++++++++++--
 .../active_record/connection_adapters/mysql_adapter.rb    |  4 ++--
 .../connection_adapters/postgresql_adapter.rb             |  4 ++--
 .../active_record/connection_adapters/sqlite_adapter.rb   |  2 +-
 4 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 027ab8af9e..f1b7c323dc 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -67,12 +67,23 @@ module ActiveRecord #:nodoc:
   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)
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index ae065e6bc1..83cb9cff15 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -568,9 +568,9 @@ module ActiveRecord
         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
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 24482aa19a..e77ae93c21 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -944,9 +944,9 @@ module ActiveRecord
         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
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index 1c2688ba9d..5e5e30776a 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -435,7 +435,7 @@ module ActiveRecord
         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
-- 
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