{"slug":"oban-2","title":"oban","summary":"'Use when writing, scheduling, testing or debugging Oban jobs, even for","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-10-04T15:14:22.963288Z","repo":{"url":"https://github.com/oliver-kriska/claude-elixir-phoenix","stars":560,"forks":44,"license":"MIT","updatedAt":"2026-10-02T04:11:38Z"},"bodyHtml":"
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name: oban\ndescription: 'Use when writing, scheduling, testing or debugging Oban jobs, even for\na how-to question: workers, cron, retries, unique jobs, queues, Pro Workflow/Batch.\nLoad it before touching job code; it holds the job rules.'

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Oban Background Jobs Reference

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Quick reference for Elixir Oban patterns.

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Oban Pro Detection

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Before applying patterns, check for Oban Pro:

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grep -E \"oban_pro|oban_web\" mix.exs\ngrep -r \"use Oban.Pro.Worker\" lib/\ngrep -r \"Oban.Pro.Engines.Smart\" config/\n
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If Oban Pro detected, use Pro patterns for ALL new workers:

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Standard ObanOban Pro
use Oban.Workeruse Oban.Pro.Worker
def perform(%Job{})def process(%Job{})
Oban.TestingOban.Pro.Testing
Advisory lock engineOban.Pro.Engines.Smart
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Pro features (all optional): args_schema (typed args), Workflows, Batches, Chunks,\nRelay, hooks, encryption, deadlines, chaining, Smart Engine (global concurrency + rate limiting).\nPro plugins (DynamicCron, DynamicLifeline, DynamicPruner) enhance OSS equivalents — swap module, don't run both.\nSee references/oban-pro-basics.md for all patterns and migration guide.

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Iron Laws — Never Violate These

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    \n
  1. JOBS MUST BE IDEMPOTENT — Safe to retry. Use idempotency keys for payments
    2. \n
  2. JOBS MUST STORE IDs, NOT STRUCTS — JSON serialization. %{user_id: 1} not %{user: %User{}}
    3. \n
  3. JOBS MUST HANDLE ALL RETURN VALUES — :ok, {:error, _}, {:cancel, _}, {:snooze, _}
    4. \n
  4. ARGS USE STRING KEYS — Pattern match %{\"user_id\" => id} not %{user_id: id}
    5. \n
  5. UNIQUE CONSTRAINTS FOR USER ACTIONS — Prevent double-click duplicates
    6. \n
  6. NEVER STORE LARGE DATA IN ARGS — Store references (IDs, paths), not content
    7. \n
  7. SMART ENGINE: NEVER USE attempt TO LIMIT SNOOZES — Snooze rolls back attempt counter. Use meta[\"snoozed\"] instead. Causes infinite loops
    8. \n
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Quick Worker Template

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defmodule MyApp.Workers.ExampleWorker do\n  use Oban.Worker,\n    queue: :default,\n    max_attempts: 5,\n    unique: [period: {5, :minutes}, keys: [:entity_id]]\n\n  @impl Oban.Worker\n  def perform(%Oban.Job{args: %{\"entity_id\" => id}}) do\n    case process(id) do\n      {:ok, _} -> :ok\n      {:error, :not_found} -> {:cancel, \"Entity not found\"}\n      {:error, :rate_limited} -> {:snooze, {5, :minutes}}\n      {:error, reason} -> {:error, reason}\n    end\n  end\nend\n
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Return Value Meanings

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ReturnStateBehavior
:okcompletedSuccess
{:ok, value}completedSuccess with value
{:error, reason}retryableRetry with backoff
{:cancel, reason}cancelledStop permanently
{:snooze, seconds}scheduledDelay and retry
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Quick Decisions

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Which Queue?

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Testing Pattern

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use Oban.Testing, repo: MyApp.Repo\n\n# Assert enqueued\nassert_enqueued worker: MyApp.Worker, args: %{id: 1}\n\n# Execute and verify\nassert :ok = perform_job(MyApp.Worker, %{id: 1})\n
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Common Anti-patterns

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WrongRight
%{user_id: id} pattern match%{\"user_id\" => id} (string keys)
%{user: %User{}} in args%{user_id: 1} (IDs only)
No idempotency for paymentsUse idempotency keys
Ignoring return valuesHandle all outcomes explicitly
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References

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For detailed patterns, see:

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