Enforce fiber isolation mode.

Author: ioquatix

lib/async/job/adapter/active_job/railtie.rb

@@ -6,6 +6,9 @@
 require "async/job"
 require "async/job/processor/inline"
 
+# For `config.active_support.isolation_level`.
+require "active_support/railtie"
+
 require_relative "thread_local_dispatcher"
 
 module Async
@@ -65,6 +68,9 @@ def start(name = "default")
 					end
 
 					config.async_job = self
+					
+					# Ensure we have per-fiber isolation:
+					config.active_support.isolation_level = :fiber
 				end
 			end
 		end

test/async/job/adapter/active_job/railtie.rb

@@ -27,6 +27,10 @@ def perform(*arguments, **options)
 		expect(queue.server).to be_a(Async::Job::Processor::Inline)
 	end
 
+	it "defaults to per-fiber isolation" do
+		expect(subject.config.active_support.isolation_level).to be == :fiber
+	end
+
 	with "#define_queue" do
 		it "can define a queue with name conversion" do
 			block = proc{"test definition"}