From a8b370f5c2fed87001e363d18ce60a47c1748885 Mon Sep 17 00:00:00 2001
From: Johannes Barre <igel@igels.net>
Date: Thu, 10 May 2012 13:47:50 +0200
Subject: [PATCH] Don't destroy readonly models

---
 activerecord/CHANGELOG.md                     | 5 +++++
 activerecord/lib/active_record/persistence.rb | 1 +
 activerecord/test/cases/readonly_test.rb      | 1 +
 3 files changed, 7 insertions(+)

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 198b054f99..11fd0e7047 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   It's not possible anymore to destroy a model marked as read only.
+
+    *Johannes Barre*
+
+
 *   Added ability to ActiveRecord::Relation#from to accept other ActiveRecord::Relation objects
 
       Record.from(subquery)
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index 4a987c2343..a1bc39a32d 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -123,6 +123,7 @@ module ActiveRecord
     # Deletes the record in the database and freezes this instance to reflect
     # that no changes should be made (since they can't be persisted).
     def destroy
+      raise ReadOnlyRecord if readonly?
       destroy_associations
       destroy_row if persisted?
       @destroyed = true
diff --git a/activerecord/test/cases/readonly_test.rb b/activerecord/test/cases/readonly_test.rb
index 39b66b3399..df0399f548 100644
--- a/activerecord/test/cases/readonly_test.rb
+++ b/activerecord/test/cases/readonly_test.rb
@@ -23,6 +23,7 @@ class ReadOnlyTest < ActiveRecord::TestCase
     end
     assert_raise(ActiveRecord::ReadOnlyRecord) { dev.save  }
     assert_raise(ActiveRecord::ReadOnlyRecord) { dev.save! }
+    assert_raise(ActiveRecord::ReadOnlyRecord) { dev.destroy }
   end