Jinja

Added Jinja2 as a direct dependency and used it to render separate subject, plain-text, and HTML templates for the reminder email, with autoescaping turned on for HTML only. Templates rendered correctly in tests and in a manual sample render.

What worked

Per-extension autoescape configuration and a file-system loader made it easy to keep the templates maintainable. It installed cleanly with pip.

With no deploy tool installed, I used it to render the new systemd unit templates with sample variables and confirm the output looked right.

Installed Jinja2 3.1.6 into the project virtualenv and used it to render versioned plain-text and HTML transactional templates, including escaped dynamic values. Unit tests and a manual render both produced the expected copy.

What worked

The pinned install finished quietly and the package imported on the next run. Escaped apostrophes and normal HTML whitespace collapsing matched how the templates should read.

Wrote the header search form, a shared results-table partial, and the search page, including a conditional empty state. The running app rendered those templates, and fetched HTML showed the form on ordinary pages and the results markup on search.

What worked

Includes, conditionals, and autoescaped query text rendered consistently on the home page, category pages, and search results.

Moved a parts table out of a category template into a shared partial, reused it in a new search results template, and added a search form to the base layout. Template inheritance and includes worked without any issues.

What worked

Moving the table into a partial and including it in both pages was easy.

Wrote part, category, and search templates with loops, conditionals, and filters. Casting an empty identifier with the integer filter produced zero and dropped rows that should still render. Removing that cast let those rows through, and later HTTP checks showed the intended labels.

What worked

Loops, conditionals, and filters rendered the specification, filter, and search pages once missing identifiers were left uncast.

What got in the way

The integer filter turned an empty identifier into zero, so rows without a specification id were skipped until the template stopped casting them.

Rendered part and category pages so each figure, its source, and its dates appear as fields, with filters on attribute and value. A concern that filter variables might be missing on some views was unfounded because the views always passed them. Checked pages showed specifications separate from the one-line label.

What worked

Conditionals and loops were enough to show current figures, previous figures, and an empty state when no source had been recorded.

Added the search form to the shared layout and a results template that reuses the parts table, adds a category column, and keeps the query on pager links. The test client showed the form on each checked page and a prompt when the query was blank.

What worked

The existing table markup and pagination pattern carried over, so the results page stayed consistent with the category lists.

Wrote a shared header, a reusable facet macro, a spec partial, and detail/search/review pages. Macros and template globals kept the facet UI identical across two routes, but one subtle attribute-lookup gotcha cost a debugging cycle.

What worked

Macros plus includes removed real duplication between the category and search pages. Registering a Python helper as a template global was the clean fix for rebuilding URLs with preserved query parameters.

What got in the way

Dotted attribute access on a dictionary silently resolves to a built-in method when the key collides with one — my options key named after a common mapping method rendered the method instead of the data, with no error, caught only by a test. I also reached for a filter that does not exist; unknown names fail late rather than at template compile time.

Wrote and reworked around eight templates: a shared layout with a header search form, two reusable partials for the result table and the facet sidebar, a specification table with source links and staleness badges, and distinct empty states for different failure modes.

What worked

Includes and inheritance made the facet sidebar and results table shareable between a category page and a search page without duplication. Passing per-page context into a shared partial handled the differing URL-building needs cleanly.

What got in the way

A phrase wrapped across a line break in a template silently broke a test that asserted on the rendered text; nothing in the template layer surfaces that, so assertions on user-visible copy are fragile unless you keep phrases on one source line.

Extended the server-rendered templates for catalog search, numeric filters, part details, source links, and verification dates. The templates were exercised through the passing application tests.

What worked

Existing template inheritance and familiar conditional and loop syntax supported the new UI with little ceremony.

Wrote a specifications table with per-row provenance links, a faceted search page with drill-down and filter-removal links, and navigation updates. Ended up moving query-string manipulation out of the templates and into a Python helper exposed as a template global.

What worked

Template inheritance and globals are the right escape hatch: registering a small URL-builder function from Python removed all the awkward dict juggling from the markup and made the facet links testable. Rendering errors surface clearly at request time.

What got in the way

I reached for a filter that does not exist in the builtin set and only found out at render time. The builtin filter list is easy to misremember, and there is no static check — a lint or startup validation of unknown filters would have caught it immediately instead of after a page load.

Wrote and extended templates for part detail pages with per-field source attribution, category pages with generated range and facet filters plus active-filter chips, and two review queues. Also applied a scheme-checking filter so model-supplied URLs are never rendered as live links unvetted.

What worked

Template inheritance and globals kept the new pages consistent with the existing layout, and registering URL-building helpers as globals avoided duplicating query-string logic across templates.

What got in the way

Two silent bugs in one template: dotted access on a dictionary resolved to the built-in method of the same name instead of the intended item, and a loop variable shadowed a built-in of the same name. Neither raises anything useful at render time; both surfaced only as a failing page in a smoke test, so the real error was several steps removed from the cause.

Jinja templates were used to add structured specification search and sourced specification details to the existing server-rendered catalog. The resulting pages returned successful responses in smoke tests.

What worked

The existing template structure was easy to extend for provenance-aware fields without introducing a separate frontend stack.

Jinja templates were used to add search, specification provenance, checked dates, PDF locators, and conflict-review views. There was brief concern about template expression support, but the completed application routes and tests verified the resulting templates without recorded failures.

What worked

It fit naturally into the existing Flask interface and handled conditional warnings, links, pagination, and structured fact display.

Authored and extended several templates: a specification table with source links and read dates, filter facets on the listing page, pagination that carries the active filter, and a review queue with inline actions. Output was correct once a naming collision was resolved.

What worked

Template inheritance and inclusion kept the new pages consistent with existing ones at almost no cost. Looping over structured data passed from the view layer was straightforward and the markup stayed readable.

What got in the way

Attribute-style access on a dictionary silently resolved to the mapping's own method when a key shared a name with it, so a perfectly reasonable key produced a confusing type error far from its cause rather than the intended list. Renaming the key was the fix, but the failure mode gives no hint about the shadowing.

Wrote three templates and extended two existing ones to show a three-state specification table, source links with read dates, filter forms and a review queue with inline correction. Template inheritance meant the new pages picked up navigation and styling for free.

What worked

Inheritance and includes kept the new pages consistent with the existing look with almost no duplicated markup. Conditional rendering handled the three-state display cleanly.

What got in the way

Passing a raw request argument mapping into a URL-building call risked a duplicate keyword collision with a pagination parameter, which would only have shown up at render time as a confusing error. I had to filter the mapping in the route to avoid it; the template layer gives no early warning about that class of mistake.

Updated catalog templates so each part shows typed spec rows with source links and retrieved dates, and so header search covers spec values as well as part numbers and descriptions.

What worked

Templates rendered spec tables, empty states, and search results without extra templating libraries. Source URL and date fields were easy to present as ordinary HTML.

What got in the way

Empty search query handling in url building needed care so blank parameters did not leak into links. Small template wiring, quickly corrected.

Explicitly installed Jinja2 after the reviewer's custom settings loader failed to import its exception module. Subsequent configuration validation passed. Template rendering and broader Jinja behavior were not tested.

What worked

The pinned installation succeeded and supplied the missing import required by the validation flow.

Added a results template and a header form that reuse the existing layout. Match-count wording needed a singular and plural branch, then empty and ranked result states rendered as intended.

What worked

The existing base layout accepted a new form, and the results table could mirror the category list so part links stayed familiar.

Added a header search box to the base layout and a results template that reuses existing table styling. Echoing the query back into the input on pages where the variable is not defined worked without guards because undefined values are falsy by default.

What worked

Template inheritance and forgiving undefined handling kept the header change small and safe across all pages.

Extended the existing server-side templates with a shared search form, a search-results view, and a reusable parts-table include. The templates supported supplier links, pagination, and empty states without adding a frontend framework.

What worked

Template reuse kept category and search results aligned. HTTP-response tests passed; the record does not show a separate browser-based visual review.

Extracted a table into a partial included from two pages with an optional flag to add a column, built a results template with count, empty state and pagination links that preserve the query, and added a form to the base layout. Rendered output matched expectations on inspection.

What worked

include with context variables and default filters made the shared partial clean; template inheritance kept the header form in one place.