Updating portal settings (name, header text, page title, homepage link)
on a portal that already has a logo attached returns 500. The error is
\`NoMethodError: undefined method 'valid_encoding?' for an instance of
Integer\`. The fix is a two-character change in
\`process_attached_logo\`.
Closes#13300
## Root cause
\`ActiveStorage::Blob.find_signed\` expects a signed ID string (e.g.
\`"eyJfcmFpbH..."\`). Internally it calls \`valid_encoding?\` on the
argument to validate the signature payload — a method that exists on
\`String\` but not \`Integer\`.
When a portal already has a logo, the frontend includes the blob's raw
database integer ID (e.g. \`blob_id: 170\`) in the update request
payload. The controller passes this integer directly to \`find_signed\`,
which immediately raises \`NoMethodError\` before any database query is
made.
\`\`\`ruby
# before, crashes when blob_id is an Integer
blob_id = params[:blob_id]
blob = ActiveStorage::Blob.find_signed(blob_id) # NoMethodError here
@portal.logo.attach(blob)
\`\`\`
## What changed
\`\`\`ruby
# after, safe for any input type
blob = ActiveStorage::Blob.find_signed(params[:blob_id].to_s)
@portal.logo.attach(blob) if blob
\`\`\`
\`.to_s\` on an Integer produces a plain decimal string (\`"170"\`),
which is not a valid signed ID. \`find_signed\` returns \`nil\` for any
invalid signature rather than raising, so the nil guard prevents a
broken \`attach\` call. The existing logo remains attached and the
settings update succeeds.
## Trade-offs considered
| Option | Decision |
|---|---|
| \`find(blob_id)\` when input is an Integer | Bypasses signature
verification — any authenticated user knowing a blob ID could attach
arbitrary files to a portal. Security risk. Rejected. |
| Raise a 422 for non-string blob_id | Overly strict — the frontend
sending an integer is pre-existing behaviour this PR shouldn't break. |
| Silently no-op for invalid blob_id (chosen) | Correct product
behaviour: if no valid signed upload is provided, leave the logo
unchanged. The settings update still succeeds. |
## Known limitation
The correct long-term fix is also on the frontend: it should only send
\`blob_id\` when attaching a **new** upload (using the signed ID from
the direct-upload flow), not when re-submitting the existing logo's raw
database integer ID. This PR makes the server robust against the current
frontend behaviour without requiring a coordinated frontend change.
## How to reproduce
1. Create a Help Center portal and upload a logo
2. Update any text field via \`PUT /api/v1/accounts/:id/portals/:slug\`
while including \`blob_id: <integer>\` in the payload
3. Observe 500 with \`NoMethodError: undefined method 'valid_encoding?'
for an instance of Integer\`
After this fix, the request returns 200, settings are updated, and the
existing logo is preserved.
Co-authored-by: Ramalau Debeila <rdebeila@datacentrix.co.za>
