dd7f5c27e5 perf: eliminate N+1 queries on inboxes#index (#14451)
The `inboxes#index` API endpoint was firing 3 queries per inbox while
rendering the response — one each for the polymorphic channel, avatar
attachment, and working hours. For accounts with many inboxes this
turned a routine list call into a multi-second request — measured at 35
seconds on an account with 5,000 inboxes.

Two root causes:
1. `policy_scope` was silently discarding the controller's
`.includes(...)` chain because `InboxPolicy::Scope#resolve` returns a
fresh `user.assigned_inboxes` relation, ignoring whatever scope is
passed in. So the eager loading never actually applied.
2. `Inbox#weekly_schedule` called `working_hours.order(...).select(...)`
which fires a new query per inbox even when the association is
preloaded.

The fix chains the eager loads and ordering after `policy_scope` so they
apply to the relation the policy actually returns, adds `:portal` and
`:working_hours` to the preload list, and refactors `weekly_schedule` to
sort the preloaded collection in Ruby and build the hash directly.

Result: queries drop from O(n) to a constant ~15 regardless of inbox
count, and total request time drops 5–6× across every account size
tested. Response payload is byte-identical.

## How to test

1. Open the agent dashboard for an account with a large number of
inboxes (1000+). On a stock dev DB you can seed quickly with
`Seeders::AccountSeeder` or by creating a few hundred `Channel::Api`
inboxes via the rails console.
2. Hit any UI surface that lists inboxes (settings → inboxes, sidebar
inbox list, agent assignment dropdowns). Should feel near-instant where
it previously hung.
3. Confirm every inbox shows the same data as before — channel type,
working hours, avatar, portal/help-center link. No fields should be
missing or different.

## Benchmarks

Real HTTP requests via curl against a dev Rails server (median of 5
timed trials after warmup; "Server total" is the time reported in Rails'
`Completed 200 OK in <X>ms` log line).

| Account | Channel mix | OLD | NEW | Speedup |
|---|---|---|---|---|
| 1000 inboxes | 3 types, no portals/avatars | 5.87 s | 0.96 s |
**6.1×** |
| 5000 inboxes | 3 types, no portals/avatars | 33.07 s | 6.93 s |
**4.8×** |
| 5000 inboxes | 10 types, 25% portals, 10% avatars | 35.04 s | 6.55 s |
**5.4×** |

Detailed breakdown for the realistic 5000-inbox case:

|                 | OLD       | NEW      | Δ        |
|-----------------|-----------|----------|----------|
| Server total    | 35,042 ms | 6,550 ms | −81%     |
| Views           | 32,034 ms | 6,452 ms | −80%     |
| ActiveRecord    | 2,948 ms  | 92 ms    | −97%     |
| Allocations     | 42.3 M    | 11.3 M   | −73%     |
| Queries         | ~15,000   | 15       | −99.9%   |

## What changed

- `app/controllers/api/v1/accounts/inboxes_controller.rb` — chain
`.includes(:channel, :portal, :working_hours, avatar_attachment:
:blob).order_by_name` *after* `policy_scope(...)`. The previous code
passed them into `policy_scope` but the policy resolver dropped the
chain.
- `app/models/concerns/out_of_offisable.rb` — `weekly_schedule` now
sorts the preloaded `working_hours` collection in Ruby and constructs
the result hashes inline, avoiding both the per-inbox query from
`.order(...).select(...)` and the `as_json` reflection overhead.

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
2026-05-14 14:20:52 +05:30
2019-11-25 09:48:11 +05:30
2019-08-14 15:18:44 +05:30
2019-08-14 15:18:44 +05:30
2019-08-14 15:18:44 +05:30
2026-01-15 20:28:13 -08:00
2023-05-06 10:44:52 +05:30
2019-10-20 14:17:26 +05:30
2019-08-14 15:18:44 +05:30
2024-02-01 15:37:05 +05:30
2024-10-02 00:36:30 -07:00
2024-10-02 00:36:30 -07:00
2024-10-02 00:36:30 -07:00
2025-01-16 10:59:33 -08:00
2026-04-16 19:02:23 +05:30

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