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The previous behaviour of render file: was essentially the same as
render template:, except that templates can be specified as an absolute
path on the filesystem.
This makes sense for historic reasons, but now render file: is almost
exclusively used to render raw files (not .erb) like public/404.html. In
addition to complicating the code in template/resolver.rb, I think the
current behaviour is surprising to developers.
This commit deprecates the existing "lookup a template from anywhere"
behaviour and replaces it with "render this file exactly as it is on
disk". Handlers will no longer be used (it will render the same as if
the :raw handler was used), but formats (.html, .xml, etc) will still be
detected (and will default to :plain).
The existing render file: behaviour was the path through which Rails
apps were vulnerable in the recent CVE-2019-5418. Although the
vulnerability has been patched in a fully backwards-compatible way, I
think it's a strong hint that we should drop the existing
previously-vulnerable behaviour if it isn't a benefit to developers.
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This commit keeps a stack of lookup contexts on the ActionView::Base
instance. If a format is passed to render, we instantiate a new lookup
context and push it on the stack, that way any child calls to "render"
will use the same format information as the parent. This also isolates
"sibling" calls to render (multiple calls to render in the same
template).
Fixes #35222 #34138
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This commit exposes all system wide view paths so that we can clear
their caches.
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Now we can throw away the subclass and the generated methods will get
GC'd too
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This PR adds the allocations to the instrumentation for template and
partial rendering.
Before:
```
Rendering posts/new.html.erb within layouts/application
Rendered posts/_form.html.erb (9.7ms)
Rendered posts/new.html.erb within layouts/application (10.9ms)
Completed 200 OK in 902ms (Views: 890.8ms | ActiveRecord: 0.8ms)
```
After:
```
Rendering posts/new.html.erb within layouts/application
Rendered posts/_form.html.erb (Duration: 7.1ms | Allocations: 6004)
Rendered posts/new.html.erb within layouts/application (Duration: 8.3ms | Allocations: 6654)
Completed 200 OK in 858ms (Views: 848.4ms | ActiveRecord: 0.4ms | Allocations: 1539564)
```
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Currently, the following error is shows only when run the test using
`bin/test`.
```
./bin/test -w test/template/log_subscriber_test.rb
Run options: --seed 17167
# Running:
/rails/actionview/test/template/log_subscriber_test.rb:34: warning: instance variable @defined_root not initialized
```
In `AVLogSubscriberTest`, if the `Rails.root` is not defined, define the
method and undef it in teardown.
https://github.com/rails/rails/blob/master/actionview/test/template/log_subscriber_test.rb#L21..L33
However, in `bin/test`, `Rails.root` is defined, which results in referring to
uninitialized variables and warnings.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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st0012/fix-partial-cache-logging
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boolean.
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Implement naive partial caching mechanism.
Add test for LogSubscriber
Use ActionView::Base#log_payload to store log_subscriber's payload, so we can pass cache result into it.
Fixed tests
Remove useless settings
Check if #log_payload exists before calling it. Because other classes also includes CacheHelper but don't have is attribute
Use @log_payload_for_partial_reder instead of #log_payload to carry ActionView's payload.
Update test's hash syntax
Add configuration to enable/disable fragment caching logging
Remove unless test and add new test to ensure cache info won't effect next rendering's log
Move :enable_fragment_cache_logging config from ActionView to ActionPack
Apply new config to tests
Update actionview's changelog
Update configuration guide
Improve actionview's changelog
Refactor PartialRenderer#render and log tests
Mute subscriber's log instead of disabling instrumentation.
Fix typo, remove useless comment and use new hash syntax
Improve actionpack's log_subscriber test
Fix rebase mistake
Apply new config to all caching intstrument actions
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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we have started to render something, at the very beginning.
This helps to easily identify queries from controller vs views
Fixes #23710
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Augments the collection caching with some instrumentation that's logged.
For collections that have been cached like:
```ruby
<%= render partial: 'notifications/notification', collection: @notifications, cached: true %>
```
We'll output a line showing how many cache hits we had when rendering it:
```
Rendered collection of notifications/_notification.html.erb [0 / 100 cache hits] (3396.5ms)
```
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