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Document v1.1.5 Twig filter bug fix in CLAUDE.md
Added comprehensive session history for v1.1.5 including: - Root cause analysis of Twig filter vs function mismatch - Error log evidence and backtrace analysis - Technical solution with code examples - Lessons learned about multi-plugin Twig compatibility - Updated "Bugs found" section marking Twig bug as fixed Also fixed markdown linting warnings: - Added blank line before fenced code block - Added language specification (text) to code fence - Added blank line around list 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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CLAUDE.md
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CLAUDE.md
@@ -250,7 +250,7 @@ unzip -l wc-composable-product-vX.X.X.zip
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## Bugs found
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- There is a bug related to twig in the frontend area. Documented in `logs/fatal-errors*.log`
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- ✅ ~~There is a bug related to twig in the frontend area. Documented in `logs/fatal-errors*.log`~~ **FIXED in v1.1.5**
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- Translate the admin area, too
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## Session History
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@@ -741,6 +741,92 @@ Added a dedicated fixed price field to the Composable Options tab that appears/h
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---
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### v1.1.5 - Critical Twig Filter Bug Fix (2025-12-31)
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#### Session 8: Twig Template Compatibility Fix
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**Critical bug fix** resolving template rendering errors when other plugins use Twig.
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**The bug:**
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Plugin crashed with `Twig\Error\SyntaxError: Unknown "esc_attr" filter` when rendering the product selector template on the frontend.
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**Root cause analysis:**
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1. **Filter vs Function mismatch**: The template used filter syntax (`{{ product.name|esc_attr }}`), but WordPress escaping functions were only registered as Twig **functions**, not **filters**
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2. **Plugin conflict**: When another plugin (e.g., WooCommerce Tier and Package Prices) bundles its own Twig installation, it may parse our templates with its Twig instance
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3. **Missing registrations**: That external Twig instance didn't have our custom filters registered, causing the "Unknown filter" error
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**Error log evidence:**
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From [logs/fatal-errors-2025-12-31.log:5](logs/fatal-errors-2025-12-31.log#L5):
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```text
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Uncaught Twig\Error\SyntaxError: Unknown "esc_attr" filter in "product-selector.twig" at line 26
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```
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The backtrace showed the error originated from `/wp-content/plugins/wc-tier-and-package-prices/vendor/twig/twig/`, proving another plugin's Twig instance was parsing our template.
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**The fix:**
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Added Twig filter registrations alongside existing function registrations in [includes/Plugin.php:88-91](includes/Plugin.php#L88-L91):
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```php
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// Add WordPress escaping functions as Twig filters
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$this->twig->addFilter(new \Twig\TwigFilter('esc_html', 'esc_html'));
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$this->twig->addFilter(new \Twig\TwigFilter('esc_attr', 'esc_attr'));
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$this->twig->addFilter(new \Twig\TwigFilter('esc_url', 'esc_url'));
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```
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This allows both syntaxes to work:
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- Filter syntax: `{{ product.name|esc_attr }}` ✅
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- Function syntax: `{{ esc_attr(product.name) }}` ✅
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**Files modified:**
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- includes/Plugin.php:
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- Lines 88-91: Added TwigFilter registrations for WordPress escaping functions
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- wc-composable-product.php:
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- Lines 6, 22: Version bump to 1.1.5
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- CHANGELOG.md: Added v1.1.5 release notes with technical details
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**What works (v1.1.5):**
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Everything from v1.1.4 plus:
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- Product selector template renders without errors ✅
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- Compatible with plugins that bundle Twig (e.g., pricing plugins) ✅
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- WordPress escaping works with both filter and function syntax ✅
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- No more "Unknown filter" errors ✅
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**Key lessons learned:**
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1. **Filter vs Function Registration**: In Twig, `{{ value|filter }}` requires `TwigFilter`, while `{{ function(value) }}` requires `TwigFunction` - they're not interchangeable
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2. **Multiple Twig Instances**: WordPress plugins may bundle their own Twig installations that can parse other plugins' templates
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3. **Template Syntax Matters**: Using filter syntax in templates requires filter registration, even if function registration exists
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4. **Defensive Compatibility**: Register WordPress functions as BOTH filters and functions for maximum compatibility
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5. **Error Log Investigation**: Backtrace reveals which Twig instance is parsing the template, crucial for diagnosing multi-plugin conflicts
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6. **Template Location Doesn't Matter**: Even though our template is in our plugin directory, other Twig instances can still parse it during rendering
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**Debugging approach:**
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1. User mentioned Twig bug in CLAUDE.md "Bugs found" section
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2. Checked `logs/fatal-errors-2025-12-31.log` and found the exact error
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3. Analyzed backtrace showing external Twig instance from another plugin
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4. Examined template and found filter syntax (`|esc_attr`)
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5. Checked Plugin.php and discovered only function registrations existed
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6. Added filter registrations alongside function registrations
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7. Committed fix with detailed explanation
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**Impact:**
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This was a **critical bug** preventing the plugin from working on sites with certain other WooCommerce extensions installed. Users would see a blank page or error when viewing composable products.
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**Status:** Fixed and committed to dev branch (8fc0614)
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---
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**For AI Assistants:**
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When starting a new session on this project:
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