view_component 4.16.0

on Ruby Gems

4.16.0

• Fix subclasses defined after their parent renders a collection using the parent's default collection parameter name instead of their own. Fix recompiling a component not refreshing its collection parameter, counter, and iteration detection. Compute that detection when a component compiles, and store the results frozen so they're shareable across Ractors.

  Ben Sheldon

• Fix collection counter and iteration detection, and collection and reserved parameter validation, when initialize arguments are forwarded through anonymous arguments (... or **), such as by prepended modules and subclasses calling super.

  Ben Sheldon

• Update development and documentation dependencies, baseline existing Audition findings, and accommodate updated lint rules.

  Joel Hawksley

• Invalidate Action View's memoized template digests when a component registers with ViewComponent::CacheDigest, so a digest computed before the component loaded isn't served for the rest of the process.

  Erik Axel Nielsen

• Raise errors encountered while computing a component's cache digest instead of degrading to an untracked component that can serve stale fragments.

  Erik Axel Nielsen

• Give <% cache %> blocks inside a component's own template a digest, for components that include ViewComponent::ExperimentallyCacheable.

  Rails digests the virtual path of whichever template is rendering. Inside a component that path resolves to no template, because component templates aren't in the view paths, so the Digestor returned an empty digest and the fragment was never invalidated. The only signal was a Couldn't find template for digesting line in the log. 4.15.0 fixed the case where the cache block wraps the component in a view. This fixes the case where the block sits in the component's template.

  Erik Axel Nielsen

• Fix line numbers and, under coverage, missing output for ERB templates that Rails doesn't annotate.

  On Rails 8.1+, ViewComponent compensated for the newline Rails adds to compiled ERB output (rails/rails#53731) for every ERB template, whether from a file or from erb_template. That newline lives inside the <!-- BEGIN ... --> annotation, which Rails only emits when annotate_rendered_view_with_filenames is enabled and the template's format is HTML. Compensating unconditionally shifted backtraces for non-HTML templates (.text.erb, .css.erb) and for every ERB template when annotations are disabled, such as in production, by one line. When coverage was running, the same mismatch made the annotation-stripping workaround remove real template source, so non-HTML templates rendered empty.

  Inline templates now decide the compensation when they compile rather than when the component class is defined, matching file templates.

  Ryutaro Mizokami

• Reduce per-render allocations. Inline renders drop 2 to 3 allocations and collection renders drop 4 to 8 depending on Rails/Ruby version by caching the instrumentation-enabled flag at the module level, memoizing the empty-details Requested per LookupContext, hoisting per-item metadata lookups out of the collection render loop, and dropping a few gratuitous ** splats on the Collection API boundary.

  Joel Hawksley