Etechflow_ProductWarning — Product Warning Banners for Magento 2

Per-product and per-category warning banners on the storefront PDP. Admin can create coloured notices ("This item ships from a remote warehouse", "Cutting service unavailable for this key", "Backorder — 7 day lead time", etc.), assign them to specific products or whole categories, and the storefront auto-renders them above the price.

• Version: 1.0.0
• Package: etechflow/module-product-warning
• Magento: 2.4.4 – 2.4.8 (newer versions should work; report incompatibilities)
• PHP: 8.1, 8.2, 8.3
• License: proprietary (LICENSE.txt) — Commercial licenses available at https://etechflow.com
• Vendor: ETechFlow — https://etechflow.com

What you get

• Admin grid + edit form under Catalog → Inventory Warning
  • Warning name (admin-only label)
  • Warning message (customer-facing text)
  • Color (hex picker, used for the banner tint + left border)
  • Active toggle, sort order
  • Assigned categories (multi-tree picker — assigns to every product in those categories)
  • Assigned products (search + multi-select picker)
• Storefront PDP rendering (auto-injected via this module's own layout XML — no theme override required)
  • Stacks multiple warnings if a product matches several
  • Tints background + border using the warning's color
  • Scoped CSS namespace (.epw-*) — won't collide with theme classes
• Resolver model (ETechFlow\ProductWarning\Model\WarningResolver::getForProduct($product)) for stores that want to render warnings in a custom location (e.g., listing pages, cart, emails)
• Theme-agnostic by design — works on Hyvä, Luma, Mage-OS adminhtml, and any custom theme

Theme compatibility

See COMPATIBILITY.md for the design choices that make this portable.

Quick start

# 1. Extract into your Magento root
unzip etechflow-module-product-warning-1.0.0.zip -d <magento-root>/

# 2. Enable + migrate
bin/magento module:enable Etechflow_ProductWarning
bin/magento setup:upgrade
bin/magento setup:di:compile      # production-mode only
bin/magento cache:flush

# 3. Visit the admin
open https://your-store.example.com/admin/etechflow_warning/warning/index
# (or: Admin sidebar → Catalog → Inventory Warning)

A fresh install starts with an empty warnings grid. Click Add New Warning, set name + message + colour, assign it to a product or category, and reload the PDP — the banner renders above the price.

Documentation index

Support

• Email: [email protected]
• Include: Magento version, PHP version, active theme, steps to reproduce, screenshot of the PDP with browser inspector open.

License

proprietary — free for commercial and non-commercial use. See LICENSE.txt.

Changelog — ETechFlow Product Warning

All notable changes to this module. Adheres to Semantic Versioning.

[1.0.2] — 2026-06-05 — Fix blank admin grid + remove default-data seed

Fixed

• Admin grid + edit form rendered as blank pages. Five XML files were
  still named with the pre-rename keystation_* prefix while the
  module's route id had been changed to etechflow_warning. Magento
  builds admin layout handles from {route_id}_{controller}_{action}
  and loads UI components by filename — both lookups silently failed
  to match, so /admin/etechflow_warning/warning/index returned 200
  with no errors but rendered no grid, no Add New Warning button,
  and no form on the edit page.

  Renamed (pure file renames — file contents were already correct):

  view/adminhtml/layout/
    keystation_warning_warning_index.xml     → etechflow_warning_warning_index.xml
    keystation_warning_warning_edit.xml      → etechflow_warning_warning_edit.xml
    keystation_warning_warning_newaction.xml → etechflow_warning_warning_newaction.xml
  view/adminhtml/ui_component/
    keystation_warning_listing.xml → etechflow_warning_listing.xml
    keystation_warning_form.xml    → etechflow_warning_form.xml
  

  Bug class to watch for: Magento does not error on a missing
  layout handle — it just renders the page chrome without the
  declared content. Trivial to ship to production undetected. Catch
  it with: bin/magento dev:layout:export-handles | grep <route_id>
  after every module rename.

Removed

• Setup/Patch/Data/SeedDefaultWarnings.php. New installs now land
  on an empty warnings grid. The old patch hard-coded 3
  automotive-locksmith-flavoured demo rows (Unprogrammed Remote /
  Repair Case / Un-cut Blade) that were noise for every other type of
  merchant.

  Existing v1.0.0 / v1.0.1 installs: rows already in
  etechflow_warning are not touched on upgrade — the patch is
  already recorded in patch_list, so setup:upgrade does nothing.
  Delete the seeded rows from the admin grid if no longer wanted; they
  will not come back on future upgrades.

• V101ReleaseMarker::getDependencies() previously returned
  [SeedDefaultWarnings::class]. Removed so a new install of v1.0.2
  doesn't fatal on the missing class.

Added

• Setup/Patch/Data/V102ReleaseMarker.php — always-a-patch
  discipline marker. Depends on V101ReleaseMarker so patches run
  in correct version order. No schema change.

Migration

composer update etechflow/module-product-warning
bin/magento setup:upgrade
bin/magento setup:di:compile
bin/magento cache:flush

No schema migration, no data migration. Strongly recommend upgrade
for any v1.0.0 / v1.0.1 install — the blank-grid bug makes the
admin UI unusable.

[1.0.1] — 2026-06-03 — Critical: Fix class-load fatal in PDP Notice block

Fixed

• Block/Frontend/Notice.php class-load fatal: the $resolver
  property was declared private, but Magento's \Magento\Framework\ View\Element\Template parent class declares its own $resolver as
  protected. PHP requires equal-or-weaker visibility on inherited
  property overrides, so v1.0.0 caused setup:di:compile and PDP
  render to fatal with:

  Fatal error: Access level to ETechFlow\ProductWarning\Block\Frontend\
  Notice::$resolver must be protected (as in class Magento\Framework\
  View\Element\Template) or weaker
  

  Caught on first local Docker install — php -l does NOT detect
  this class of bug because it's a class-load-time check, not a
  syntax check. Same bug class flagged in the eTechFlow memory after
  similar issues in earlier modules.

  Fix: renamed the property $resolver → $warningResolver
  (along with the constructor parameter + every $this->resolver
  reference). Side-steps the collision entirely without shadowing the
  parent's actual layout resolver.

• Same class of bug to watch for elsewhere: any Magento block
  that extends Template or AbstractBlock and declares a private
  property that shadows an inherited protected one. Most-common
  offenders: $resolver, $_resolver, $escaper, $_escaper,
  $jsLayout, $_template. php -l won't catch them. setup:di: compile will, on every install.

Added

• Setup/Patch/Data/V101ReleaseMarker.php — always-a-patch
  discipline marker. Depends on SeedDefaultWarnings so patches run
  in correct version order.

Migration

composer require etechflow/module-product-warning:^1.0.1
bin/magento setup:upgrade
bin/magento setup:di:compile
bin/magento cache:flush

Pre-flight check:

SELECT module, schema_version, data_version FROM setup_module
WHERE module='ETechFlow_ProductWarning';

Both should read 1.0.1. If data_version is stale, re-run
setup:upgrade — do NOT flush cache yet.

Anyone who installed v1.0.0 hit the class-load fatal on the first
PDP render or setup:di:compile. v1.0.1 fixes it. Strongly
recommend upgrade for any v1.0.0 installs.

Added

• Admin module under Catalog → Inventory Warning
  • Grid + edit form (Magento Ui Components)
  • Hex color picker, active toggle, sort order
  • Multi-tree category assignment picker
  • Multi-select product assignment picker (searchable by name / SKU)
  • ACL resource Etechflow_ProductWarning::warnings
• Storefront PDP rendering — auto-injected via this module's own
  view/frontend/layout/catalog_product_view.xml. No theme override required.
• WarningResolver PHP API for stores that want to render warnings
  elsewhere (cart, emails, listing pages, etc.)
• DB schema (etc/db_schema.xml) — 3 tables:
  • etechflow_warning — master record (id, name, message, color, active, sort_order, timestamps)
  • etechflow_warning_category — category assignment pivot
  • etechflow_warning_product — product assignment pivot
• Demo data installer patch — seeds 3 example warnings on first install
• Scoped frontend CSS — .epw-* namespace, inline <style> block
• Zero JavaScript on frontend — pure server-rendered HTML
• Documentation bundle
  • README, INSTALL, USAGE, COMPATIBILITY, CONFIGURATION, UNINSTALL, CHANGELOG, LICENSE

Compatibility

• Magento 2.4.4 – 2.4.8
• PHP 8.1, 8.2, 8.3
• Hyvä Theme + Luma + custom themes
• Adobe Commerce + Magento Open Source + Mage-OS

Migration

If you previously had the original Keystation_ProductWarning module on a
store, follow the data-copy SQL in INSTALL.md → Upgrading from Keystation_ProductWarning to bring the data across.