update readme and initializer

README.md

@@ -87,6 +87,19 @@ class MyJob < ActiveJob::Base
 end
 ```
 
+### Control redis connection errors
+
+```ruby
+class MyJob < ActiveJob::Base
+  # Proc gets the job instance including its arguments, and as keyword arguments the resource(lock key) `resource` and the original error `error`
+  unique :until_executing, on_redis_connection_error: ->(job, resource: _, error: _) { job.logger.info "Oops: #{job.arguments}" }
+
+  def perform(args)
+    # work
+  end
+end
+```
+
 ### Control lock key arguments
 
 ```ruby

lib/generators/active_job/uniqueness/templates/config/initializers/active_job_uniqueness.rb

@@ -19,6 +19,13 @@
   #
   # config.on_conflict = :raise
 
+  # Default action on redis connection error. Can be set per job.
+  # Allowed values are
+  #   :raise - raises ActiveJob::Uniqueness::JobNotUnique
+  #   proc - custom Proc. For example, ->(job, resource: _, error: _) { job.logger.info("Job already in queue: #{job.class.name} #{job.arguments.inspect} (#{job.job_id})") }
+  #
+  # config.on_conflict = :raise
+
   # Digest method for lock keys generating. Expected to have `hexdigest` class method.
   #
   # config.digest_method = OpenSSL::Digest::MD5