キュウリを使ったDelayedJobによるメール送信をテストしようとしています。この機能は実際にはブラウザ（開発環境と本番環境の両方）で機能しますが、テストしようとすると奇妙なSQlite3例外が発生します。
テストログは下部にあります。ご覧のとおりSQLite3::SQLException、メール送信ジョブをキューに挿入した直後で失敗します。
Delayed :: Jobによると、失敗の理由は次のとおりです。
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'
誰かがここで何が起こっているのか分かりましたか？
関連する質問を見つけましたが、そこでの問題はテスト環境に限定されているようには見えません。したがって、解決策は同じではないと思います。
完全なテストトレースは次のとおりです。
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''
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/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