---

PrestaShop Module Development

When to use

Use this skill for PrestaShop module development tasks such as:

• Creating new modules with modern architecture (Symfony controllers, services, entities)
• Refactoring legacy modules to use modern PrestaShop patterns
• Implementing hooks, actions, and event listeners
• Adding configuration pages (modern Symfony-form approach)
• Creating front office features and widgets
• Setting up database entities and migrations
• Implementing security measures (CSRF, input validation, SQL injection prevention)
• Adding multilingual support and translations
• Converting legacy code patterns (HelperForm, jQuery UI sortable, ObjectModel) to modern equivalents
• Building list pages with the PrestaShop Grid system (filters, pagination, toggle, drag-and-drop position)

Inputs required

• PrestaShop version (target 8.x/9.x for modern development)
• Module scope and functionality requirements
• Existing module path (if updating legacy code)
• Database schema requirements (if applicable)
• Front office integration needs (hooks, widgets, pages)
• Configuration requirements (settings, admin interface)
• Multilingual requirements and supported languages

Procedure

0) Project structure & namespace naming

Read: references/module-structure.md

Key rules:

• Derive PSR-4 namespace from the module name prefix — never use PrestaShop\Module\
• Use the PrestaShop Module Generator to scaffold new modules

1) Main module class & installer

Read: references/module-class-and-installer.md

Key rules:

• Always require_once __DIR__ . '/vendor/autoload.php'; after the _PS_VERSION_ guard
• Never put hook registration, DB queries, or Configuration:: calls directly in install() — delegate to src/Install/Installer.php
• Do NOT add getTabs() to the main module class — manage tabs entirely via Installer::installTabs() / uninstallTabs()
• Default parent tab is Adminwswebsenso (shared Websenso group); check existence before creating it
• getContent() must only redirect to the Symfony route, never render HTML
• No SQL in the main module class — all database access (including in hooks like hookActionShopDataDuplication and widget methods like getWidgetVariables) must be delegated to the Repository or Manager class via $this->get('service.id')
• Always guard service access — use $this->has() + null check in admin context; use try/catch + instanceof in front-office context (stale container can make has() return true while get() still throws). See references/module-class-and-installer.md → Guard patterns section.

2) Modern configuration pages

Read: references/configuration-page.md

Key rules:

• Do NOT use HelperForm — use Symfony form components + FrameworkBundleAdminController
• Four classes: DataConfiguration, FormDataProvider, FormType, Controller
• Wire everything in config/services.yml and config/routes.yml

3) Database operations & entities

Read: references/database-and-entities.md
For translatable entities with Grid: read references/entity-doctrine.md

• Always use Doctrine ORM (Entity + LangEntity + Repository + Manager) for any entity that has a Grid list page or translatable fields
• ObjectModel is legacy — do not use in new or modernised modules
• Entity class name = table name without _DB_PREFIX_ — PS adds the prefix globally; use @ORM\Table() with no name= parameter
• All table names must start with ws_ — e.g. ws_mymodule_items, ws_mymodule_items_lang — to group Websenso tables together
• Do NOT create MetadataListener or Doctrine event listeners for table naming
• Always sanitize raw DBAL SQL: cast IDs with (int), use bound parameters
• No raw SQL (Db::getInstance(), pSQL(), _DB_PREFIX_ string concatenation) outside Repository and Manager classes. This applies everywhere: main module class, Installer, FixturesInstaller, hooks, widget methods. The only exception is Installer SQL schema queries (CREATE TABLE, DROP TABLE) which have no Repository equivalent.
• FixturesInstaller must NOT call module-own services — the module's services are not in the container at install time. Instantiate Manager directly using core Doctrine services. See references/module-class-and-installer.md → FixturesInstaller — service resolution section.

Services split & components architecture

Read: references/services-split.md

Key rules:

• Repository services only in config/common.yml (Doctrine-level, no PrestaShopBundle deps)
• All PrestaShopBundle-dependent services go in config/admin/services.yml
• Always split into component sub-folders under config/components/ — never one flat services.yml

4) Security (mandatory)

Read: references/security.md

• CSRF: handled by Symfony forms automatically; validate manually for raw AJAX endpoints
• SQL injection: (int) + pSQL() on every value, or use DbQuery builder
• File uploads: pass full $_FILES-compatible array (including type, size, error) to ImageManager::validateUpload()

5) Hooks & front office integration

Read: references/hooks-and-front-office.md

• Register hooks in Installer, not in install() directly
• Load assets only for the relevant controller in hookDisplayBackOfficeHeader
• Implement WidgetInterface for front office widgets

6) Translations

Read: references/translations.md

• Use $this->trans('Text', [], 'Modules.Mymodule.Admin') in PHP
• Use 'Text'|trans({}, 'Modules.Mymodule.Admin') in Twig
• Declare isUsingNewTranslationSystem(): true in the module class

7) Legacy code conversion

Read: references/legacy-conversion.md

Common conversions: HelperForm → Symfony form, jQuery UI sortable → Grid PositionColumn, ModuleAdminController → FrameworkBundleAdminController.

8) Services & dependency injection

Read: references/services-and-di.md

• Define services in config/services.yml
• Use $this->get('service.id') in Symfony controllers
• Use Expression Language (@=) for computed constructor arguments

9) Grid system (list pages with drag-and-drop position)

Read: references/grid-system.md

Full pattern for building CRUD list pages with the PS Grid system:

• GridDefinitionFactory — columns (PositionColumn, ToggleColumn, ActionColumn), filters, row actions
• QueryBuilder — Doctrine DBAL query with sorting, pagination, and filters
• Filters — default sort/limit settings
• 5 service definitions in services.yml (factory, query, data, grid, position)
• 4 routes in routes.yml (index, search, toggle, update-position)
• 4 controller actions (indexAction, searchAction, toggleStatus, updatePositionAction)
• Pre-built JS bundle (copied from ws-entity-grid-skeleton, grid ID replaced via sed)

Verification

• Module installs without PHP errors: php bin/console pr:mo install mymodule
• Configuration saves correctly with proper validation
• Front office features display and function properly
• Translations work in all configured languages

Validation

AI agent rule — NEVER SKIP EITHER STEP. Read references/validation.md for full instructions.

Step 1 — lotr (run from the module root)

Before running lotr, check that the binary is present. If not, install it first:

# Check presence
[ -f vendor/bin/lotr ] || composer require websenso/prestashop-module-devtools

# Run lotr
vendor/bin/lotr

Note: vendor/bin/lotr is the Composer-installed symlink. The direct path vendor/websenso/prestashop-module-devtools/bin/lotr also works if present.

Expected: 🎉 All commands completed successfully! Executed: 6/6

Step 2 — Install test (run from the PS root)

php bin/console pr:mo install mymodule

Expected: L'action Install sur le module … a réussi.

Failure modes / debugging

Read: references/debugging.md

Common failure areas:

• references/debugging.md — all symptom/cause/fix tables (install, config page, Grid, InputBag, ImageManager, lotr steps)

Escalation

• PrestaShop 9 Module Creation
• Module Good Practices
• Official Example Modules
• demosymfonyform — canonical Symfony form config page
• Module Validator
• PrestaShop Developer Slack