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Code like `render(topics) => render("topics/topic")` adds confusion
for the readers. On first impression, that code feels like hash kind
of data, but it's not. So make it more clear and meaningful.
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Sorry, I missed a few places in my last PR. This should be the last of
'em :grimacing:
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Why are we here? Where did we come from? Where are we going... in 5 minutes?
These questions are not answered in this documentation. Instead collection
caching is better clarified. How it works, how it can share caches with
individual templates.
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Having collection caching that wraps templates and automatically tries
to infer if they are cachable proved to be too much of a hassle.
We'd rather have it be something you explicitly turn on.
This removes much of the code and docs to explain the previous automatic
behavior.
This change also removes scoped cache keys and passing cache_options.
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This allows expire_in (and other options) to be passed to the cache method
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Introduced in e56c63542780fe2fb804636a875f95cae08ab3f4, `CacheHelper#fragment_cache_key` is a duplicate of `ActionController::Caching::Fragments#fragment_cache_key`.
We now require the view to provide this method on its own (as with `view_cache_dependencies`); `ActionController::Caching::Fragments` exports its version as a `helper_method`.
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If a template includes `# Template Collection: ...` anywhere in its
source, that name will be used as the cache name for the partial that is
rendered for the collection.
This allows users to enable collection caching even if the template
doesn't start with `<% cache ... do %>`.
Moreover, the `# Template Collection: ...` notation is recognized in all
template types (and template types other than ERB can define a
resource_cache_call_pattern method to allow the `cache ... do` pattern
to be recognized too).
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Adds the `virtual_path` option to `cache_fragment_name` so it can
be provided when needed.
That allows `cache_collection_render` to get the appropriate cache
key with the digest generated based on the template and prevent
collision with other templates that cache the same collection.
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Merge multi_fetch_fragments.
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Collections can take advantage of `multi_read` if they render one template
and their partials begin with a cache call.
The cache call must correspond to either what the collections elements are
rendered as, or match the inferred name of the partial.
So with a notifications/_notification.html.erb template like:
```ruby
<% cache notification %>
<%# ... %>
<% end %>
```
A collection would be able to use `multi_read` if rendered like:
```ruby
<%= render @notifications %>
<%= render partial: 'notifications/notification', collection: @notifications, as: :notification %>
```
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Makes caching a collection of template partials faster using `read_multi`
on the Rails cache store.
Some caching implementations have optimized `read_multi` so we don't have
to check in the cache store for every template.
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variant -- trying to pass it back in makes a mess of things (oh, and doesnt work)
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Related to: #14242 #14243 14293
Variants passed to LookupContext#find() seem to be ignored, so
I've used the setter instead: `finder.variants = [ variant ]`.
I've also added some more test cases for variants. Hopefully this
time passing tests will mean it actually works.
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Take variants into account when calculating template digests in
ActionView::Digest.
Digestor#digest now takes a hash as an argument to support variants and
allow more flexibility in the future. Old-style arguments have been
deprecated.
Fixes #14242
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fix the typo newstopics => new topics in action view cache helper
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creation of custom cache methods.
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