` content) 2. Fetches converted JavaScript templates from `/templates/scoring.js` 3. Fetches normalized data from `/scores/:judge/heats/data` 4. Hydrates the data using `heat_hydrator.js` (for individual heats) 5. Renders using the JavaScript template 6. Compares row counts and saves both outputs for diff analysis ## Output Files All files are saved to `/tmp/` for analysis: - `/tmp/erb_rendered.html` - ERB template output (main content only) - `/tmp/js_rendered.html` - JavaScript template output - `/tmp/scoring_templates.js` - Converted templates from `/templates/scoring.js` - `/tmp/heats_data.json` - Raw normalized data from server - `/tmp/js_template_data.json` - Hydrated data passed to JS template ## Analyzing Differences ```bash # Quick diff diff /tmp/erb_rendered.html /tmp/js_rendered.html # Side-by-side comparison diff -y /tmp/erb_rendered.html /tmp/js_rendered.html | less # Compare specific attributes diff <(grep -o 'href="[^"]*"' /tmp/erb_rendered.html | sort) \ <(grep -o 'href="[^"]*"' /tmp/js_rendered.html | sort) ``` ## Common Differences Some differences are expected due to ERB-to-JS conversion limitations: - **HTML entity encoding**: ERB uses `"` while JS uses `"` - **link_to blocks**: Block form of `link_to` may render differently - **Whitespace**: Minor whitespace differences are normal ## Architecture This tool supports the "Server computes, hydration joins, templates filter" principle: - **Server**: Computes derived values and paths (respects RAILS_APP_SCOPE) - **Hydration**: `heat_hydrator.js` joins normalized data by resolving IDs - **Templates**: ERB and JS templates filter/format data identically ## Key Source Files ### Server-side (Rails) - `app/controllers/scores_controller.rb` - `heats_data` action: Returns normalized JSON data for SPA - `heat` action: Sets instance variables for ERB templates - Computes `paths:` hash with server-computed URLs - `app/controllers/templates_controller.rb` - `scoring` action: Converts ERB templates to JavaScript on-the-fly - Defines path helper stubs for JS templates - Uses `ErbPrismConverter` for conversion - `lib/erb_prism_converter.rb` - Converts ERB templates to JavaScript functions using Ruby's Prism parser - Handles Ruby-to-JS translation (loops, conditionals, method calls) ### Client-side (JavaScript) - `app/javascript/lib/heat_hydrator.js` - `buildLookupTables()`: Creates Maps for O(1) entity lookup - `hydrateHeat()`: Resolves IDs to full objects - `buildHeatTemplateData()`: Prepares complete data for templates - `app/javascript/controllers/heat_app_controller.js` - Main Stimulus controller for the offline scoring SPA - Loads templates and data, handles navigation - Manages offline/online state transitions ### ERB Templates (source of truth) - `app/views/scores/heat.html.erb` - Main heat view - `app/views/scores/heatlist.html.erb` - Heat list view - `app/views/scores/_heat_header.html.erb` - Heat header partial - `app/views/scores/_info_box.html.erb` - Info box with feedback errors - `app/views/scores/_navigation_footer.html.erb` - Prev/next navigation - `app/views/scores/_table_heat.html.erb` - Standard heat table - `app/views/scores/_rank_heat.html.erb` - Finals ranking view - `app/views/scores/_solo_heat.html.erb` - Solo heat view - `app/views/scores/_cards_heat.html.erb` - Card-based scoring view ### Scripts - `scripts/render_erb_and_js.rb` - This comparison tool - `scripts/hydrate_heats.mjs` - Node.js script for hydrating data (used by comparison tool) --- Source attribution: rubys Original project: https://github.com/rubys/showcase/blob/168b37f485f8437d7305b6aba0a55a25abbfd7ae/.claude/skills/compare-erb-js/skill.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Dave AI. ## Upstream license notice Copyright (c) 2022 Sam Ruby Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Dave AI resource metadata Creator / publisher: rubys Original project: https://github.com/rubys/showcase/blob/168b37f485f8437d7305b6aba0a55a25abbfd7ae/.claude/skills/compare-erb-js/skill.md Attribution basis: Source repository record Fields of work: Development & Engineering, Product Management Roles: Backend Developer, Frontend Developer, Product Manager Specialties: Backend Tools: Rails Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: 0c6a4a8cc80c48b02238d5bfb899318eeaedead329c0d743b0e7ef95d9a97656