我正在尝试使用黄瓜测试DelayedJob在电子邮件中的发送。该功能实际上在浏览器中工作（在开发和生产环境中），但是当我尝试测试它时遇到了一个奇怪的 SQlite3 异常。
测试日志在底部。正如您所看到的，它SQLite3::SQLException在将电子邮件发送作业插入队列之后就失败了。
根据 Delayed::Job 失败的原因是：
Delayed::DeserializationError
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/psych_ext.rb:108:in `rescue in visit_Psych_Nodes_Mapping_with_class'
有人知道这里发生了什么吗？
我发现了一个相关的问题，但那里的问题似乎不受测试环境的限制。因此，我认为解决方案不会相同。
这是完整的测试跟踪：
SQL (82.7ms) INSERT INTO "delayed_jobs" ("attempts", "created_at", "failed_at", "handler", "last_error", "locked_at", "locked_by", "priority", "queue", "run_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [["attempts", 0], ["created_at", Tue, 08 May 2012 12:14:15 UTC +00:00], ["failed_at", nil], ["handler", "--- !ruby/object:Delayed::PerformableMailer\nobject: !ruby/class 'InvitationMailer'\nmethod_name: :invite\nargs:\n- !ruby/ActiveRecord:Invitation\n attributes:\n id: 1\n sender_id: 1\n search_id: 1\n token: 4cba1a8a36de826493b1d8a8cc21091e2fb393e1\n sent_at: \n recipient_email: peter@example.com\n created_at: 2012-05-08 12:14:15.702071000 Z\n updated_at: 2012-05-08 12:14:15.702071000 Z\n recipient_id: \n accepted: \n"], ["last_error", nil], ["locked_at", nil], ["locked_by", nil], ["priority", 0], ["queue", nil], ["run_at", Tue, 08 May 2012 12:14:15 UTC +00:00], ["updated_at", Tue, 08 May 2012 12:14:15 UTC +00:00]]
(0.9ms) commit transaction
SQLite3::SQLException: cannot commit - no transaction is active: commit transaction
(0.5ms) rollback transaction
SQLite3::SQLException: cannot rollback - no transaction is active: rollback transaction
Completed 500 Internal Server Error in 126ms
SQL (1.9ms) UPDATE "delayed_jobs" SET locked_at = '2012-05-08 12:14:16.993126', locked_by = 'host:dtmbp.local pid:14059' WHERE (id = 3 and (locked_at is null or locked_at < '2012-05-08 08:14:16.993126') and (run_at <= '2012-05-08 12:14:16.993126'))
Invitation Load (0.2ms) SELECT "invitations".* FROM "invitations" WHERE "invitations"."id" = ? LIMIT 1 [["id", 1]]
Invitation Load (0.1ms) SELECT "invitations".* FROM "invitations" WHERE "invitations"."id" = ? LIMIT 1 [["id", 1]]
Invitation Load (0.1ms) SELECT "invitations".* FROM "invitations" WHERE "invitations"."id" = ? LIMIT 1 [["id", 1]]
Invitation Load (0.1ms) SELECT "invitations".* FROM "invitations" WHERE "invitations"."id" = ? LIMIT 1 [["id", 1]]
Invitation Load (0.1ms) SELECT "invitations".* FROM "invitations" WHERE "invitations"."id" = ? LIMIT 1 [["id", 1]]
(0.1ms) begin transaction
(0.5ms) UPDATE "delayed_jobs" SET "locked_at" = '2012-05-08 12:14:16.993126', "locked_by" = 'host:dtmbp.local pid:14059', "last_error" = '{Delayed::DeserializationError
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/psych_ext.rb:108:in `rescue in visit_Psych_Nodes_Mapping_with_class''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/psych_ext.rb:101:in `visit_Psych_Nodes_Mapping_with_class''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:20:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:134:in `block in visit_Psych_Nodes_Sequence''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:134:in `each''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:134:in `visit_Psych_Nodes_Sequence''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:20:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:276:in `block in revive''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:276:in `map''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:276:in `revive''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:219:in `visit_Psych_Nodes_Mapping''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/psych_ext.rb:119:in `visit_Psych_Nodes_Mapping_with_class''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:20:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:231:in `visit_Psych_Nodes_Document''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:20:in `accept''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych/nodes/node.rb:35:in `to_ruby''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:128:in `load''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/backend/base.rb:84:in `payload_object''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/backend/base.rb:94:in `block in invoke_job''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `block in initialize''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `execute''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:38:in `run_callbacks''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/backend/base.rb:91:in `invoke_job''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:178:in `block (2 levels) in run''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/timeout.rb:68:in `timeout''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:178:in `block in run''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/benchmark.rb:295:in `realtime''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:177:in `run''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:234:in `block in reserve_and_run_one_job''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `block in initialize''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `execute''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:38:in `run_callbacks''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:234:in `reserve_and_run_one_job''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:162:in `block in work_off''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:161:in `times''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:161:in `work_off''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:133:in `block (4 levels) in start''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/benchmark.rb:295:in `realtime''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:132:in `block (3 levels) in start''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `block in initialize''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `execute''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:38:in `run_callbacks''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:129:in `block (2 levels) in start''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:128:in `loop''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:128:in `block in start''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/plugins/clear_locks.rb:7:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/plugins/clear_locks.rb:7:in `block (2 levels) in <class:ClearLocks>''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:78:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:78:in `block (2 levels) in add''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:60:in `block in initialize''
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/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `call''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:65:in `execute''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/lifecycle.rb:38:in `run_callbacks''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/gems/delayed_job-3.0.2/lib/delayed/worker.rb:127:in `start''
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/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain''
/Users/davidtuite/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke''
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/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level''
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/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/bin/rake:19:in `load''
/Users/davidtuite/.rvm/gems/ruby-1.9.3-p194/bin/rake:19:in `<main>''', "failed_at" = '2012-05-08 12:14:17.131476', "updated_at" = '2012-05-08 12:14:17.132975' WHERE "delayed_jobs"."id" = 3
(1.5ms) commit transaction