Ref: https://github.com/rails/rails/issues/48611
Individual fragments have been cached as bare string since forever,
but somehow fragment cached via collection caching were stored
as `ActionView::OutputBuffer` instances.
This is both bad for performance, but also can cause issues on
Rails upgrades if the internal representation of `AV::OutputBuffer`
changes.
In https://github.com/rails/rails/pull/45796 I overlooked that
`ActiveRecord::LogSubscriber#sql` wasn't only logging the SQL query
but was also responsible for collecting the `:db_runtime` metric.
Ultimately I think it is cleaner to move this concern to `RuntimeRegistry`.
Followup on https://github.com/rails/rails/pull/45745
`@rendered` is a much better variable for this kind of intermediate
result as that's what is used by DOM assertions.
https://github.com/rails/rails/pull/31250 optimised rendering a collection with `cached: true`, but also with `cached: proc {}`. The problem is the proc may reference associations that should be preloaded to avoid n+1s in generating the cache key.
For example:
```ruby
@posts = Post.preload(:author)
@view.render partial: "test/partial", collection: @post, cached: proc { |post| [post, post.author] }
```
This will n+1 on `post.author`.
To fix this, this PR will always preload the collection if there's a proc given for `cached`. `cached: true` will still not preload unless it renders, as it did in https://github.com/rails/rails/pull/31250.
Both methods are defined in multiple parts of the framework. It would
be useful to put them in a proper place, so that repetition is
avoided.
I chose the implementation from `ActiveRecord` because it's a bit more
complete with the `SQLCounter` class, and also because other parts
depend on it.
url_for supports building polymorphic URLs via an array
of arguments (usually symbols and records). If an array is passed,
strings can result in unwanted route helper calls.
CVE-2021-22885
This removes FallbackFileSystemResolver, LookupContext#with_fallbacks,
and LookupContext.fallbacks.
These used to exist to support `render file:`, and rendering templates
outside of the defined view paths. `render file:` has since been changed
to not use template resolution, and to only render absolute paths.
These were no longer callable through any public API.
* Fix `SELECT COUNT` queries when rendering ActiveRecord collections
Fixes#40837
When rendering collections, calling `size` when the collection is an
ActiveRecord relation causes unwanted `SELECT COUNT(*)` queries. This
change ensures the collection is an array before getting the size, and
also loads the relation for any further array inspections.
* Test queries when rendering relation collections
* Add `length` support to partial collection iterator
Allows getting the size of a relation without duplicating records, but
still loads the relation. The length method existence needs to be
checked because you can pass in an `Enumerator`, which does not respond
to `length`.
* Ensure unsubscribed from notifications after tests
[Rafael Mendonça França + aar0nr]
Follow up to c07dff72278fb7f2a3c4c71212a0773a2b25c790.
Actually it is not the cop's fault, but we mistakenly use `^`, `$`, and
`\Z` in much places, the cop doesn't correct those conservatively.
I've checked all those usage and replaced all safe ones.
Following the introduction of the @current_template variable in 1581cab,
the @virtual_path variable is now redundant, as the value of the virtual
path may be accessed via @current_template.virtual_path. This commit
removes @virtual_path and replaces any references to @virtual_path with
@current_template.virtual_path.
This commit passes the template format to the digestor in order to come
up with a key. Before this commit, the digestor would depend on the
side effect of the template renderer setting the rendered_format on the
lookup context. I would like to remove that mutation, so I've changed
this to pass the template format in to the digestor.
I've introduced a new instance variable that will be alive during a
template render. When the template is being rendered, it pushes the
current template on to a stack, setting `@current_template` to the
template currently being rendered. When the cache helper asks the
digestor for a key, it uses the format of the template currently on the
stack.
The AV::Base constructor was too complicated, and this commit tightens
up the parameters it will take. At runtime, AV::Base is most commonly
constructed here:
94d54fa4ab/actionview/lib/action_view/rendering.rb (L72-L74)
This provides an AV::Renderer instance, a hash of assignments, and a
controller instance. Since this is the common case for construction, we
should remove logic from the constructor that handles other cases. This
commit introduces special constructors for those other cases.
Interestingly, most code paths that construct AV::Base "strangely" are
tests.
This commit removes a deprecated catch-all route in the AV tests. It
defines and includes the necessary routes for each test such that we
don't need the catch-all anymore.
This also helps push us toward #33970
When no dependencies are present to be digested there is no reason to build an array just to turn around and turn it back into a string.
The dependencies array is not mutated in this method so we can use the same empty array across all invocations.
Total allocated: 791402 bytes (7294 objects)
Total allocated: 777442 bytes (7132 objects)
(791402 - 777442) / 791402.0 # => 1.76 % speed improvement
Action View overrides `url_for` in the view context to render paths by
default when using `url_for` and this means that direct route helpers
don't get the full url when called with the url suffix. To fix this
always call the original `url_for`.
The assertion will ensure that the behavior doesn't regress.
assert_equal "/projects", polymorphic_path("projects")
Remove FIXME related to polymorphic_url behavior.
polymorphic_url with Symbol or String works equally.
Example:
default_url_options[:host] = "example.com"
polymorphic_url(:projects) # => "http://example.com/projects"
polymorphic_url("projects") # => "http://example.com/projects"
Related to 37d4415a7b433fcb987b1c6a5b51bf2d8efc5d5e
