Ensure 0 is always the default for the individual exception counters in ActiveJob

Some adapters like Resque that use Redis, convert the Ruby hash with a
default value, Hash.new(0), into a regular hash without a default value
after serializing, storing and deserializing. This raises an error when
we try to access a missing exception key. A simple solution is not to
rely on the hash's default value, and provide a default as alternative
when accessing it instead.

1 files changed, 1 insertions, 1 deletions

diff --git a/activejob/lib/active_job/core.rb b/activejob/lib/active_job/core.rb
index 4ab62f89b0..487cdd6d38 100644
--- a/activejob/lib/active_job/core.rb
+++ b/activejob/lib/active_job/core.rb
@@ -81,7 +81,7 @@ module ActiveJob
       @queue_name = self.class.queue_name
       @priority   = self.class.priority
       @executions = 0
-      @exception_executions = Hash.new(0)
+      @exception_executions = {}
     end
 
     # Returns a hash with the job data that can safely be passed to the