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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:
https://github.com/rails/rails/blob/94d54fa4ab641a0ddeb173409cb41cc5becc02a9/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.
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The regexp was introduced in 186ac4cdaa911a9af659a29f2179a19b99dea13b,
and looks cosmetic. While they should be functionally identical in
theory, in practice, case insensitive (but preserving) filesystems can
give results that are differently-cased from the pattern we supplied.
I don't know how to force the filesystem to do the surprising thing,
even when running in an environment that _could_, so no new test.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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* Allow a default value to be declared for class_attribute
* Convert to using class_attribute default rather than explicit setter
* Removed instance_accessor option by mistake
* False is a valid default value
* Documentation
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All indentation was normalized by rubocop auto-correct at 80e66cc4d90bf8c15d1a5f6e3152e90147f00772.
But comments was still kept absolute position. This commit aligns
comments with method definitions for consistency.
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It is a common pattern in the Rails community that when people want to
:xa
use any kind of helper that is defined inside app/helpers they includes
the helper module inside the controller like:
module UserHelper
def my_user_helper
# ...
end
end
class UsersController < ApplicationController
include UserHelper
def index
render inline: my_user_helper
end
end
This has problem because the helper can't access anything that is
defined in the view level context class.
Also all public methods of the helper become available in the controller
what can lead to undesirable methods being routed and behaving as
actions.
Also if you helper depends on other helpers or even Action View helpers
you need to include each one of these dependencies in your controller
otherwise your helper is not going to work.
We already have a helpers proxy at controller class level but that proxy
doesn't have access to the instance variables defined in the
controller.
With this new instance level helper proxy users can reuse helpers in the
controller without having to include the modules and with access to
instance variables defined in the controller.
class UsersController < ApplicationController
def index
render inline: helpers.my_user_helper
end
end
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action_controller_overview file Rails' -> Rails" [ci skip]
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I wrote a utility that helps find areas where you could optimize your program using a frozen string instead of a string literal, it's called [let_it_go](https://github.com/schneems/let_it_go). After going through the output and adding `.freeze` I was able to eliminate the creation of 1,114 string objects on EVERY request to [codetriage](codetriage.com). How does this impact execution?
To look at memory:
```ruby
require 'get_process_mem'
mem = GetProcessMem.new
GC.start
GC.disable
1_114.times { " " }
before = mem.mb
after = mem.mb
GC.enable
puts "Diff: #{after - before} mb"
```
Creating 1,114 string objects results in `Diff: 0.03125 mb` of RAM allocated on every request. Or 1mb every 32 requests.
To look at raw speed:
```ruby
require 'benchmark/ips'
number_of_objects_reduced = 1_114
Benchmark.ips do |x|
x.report("freeze") { number_of_objects_reduced.times { " ".freeze } }
x.report("no-freeze") { number_of_objects_reduced.times { " " } }
end
```
We get the results
```
Calculating -------------------------------------
freeze 1.428k i/100ms
no-freeze 609.000 i/100ms
-------------------------------------------------
freeze 14.363k (± 8.5%) i/s - 71.400k
no-freeze 6.084k (± 8.1%) i/s - 30.450k
```
Now we can do some maths:
```ruby
ips = 6_226k # iterations / 1 second
call_time_before = 1.0 / ips # seconds per iteration
ips = 15_254 # iterations / 1 second
call_time_after = 1.0 / ips # seconds per iteration
diff = call_time_before - call_time_after
number_of_objects_reduced * diff * 100
# => 0.4530373333993266 miliseconds saved per request
```
So we're shaving off 1 second of execution time for every 220 requests.
Is this going to be an insane speed boost to any Rails app: nope. Should we merge it: yep.
p.s. If you know of a method call that doesn't modify a string input such as [String#gsub](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37) please [give me a pull request to the appropriate file](https://github.com/schneems/let_it_go/blob/b0e2da69f0cca87ab581022baa43291cdf48638c/lib/let_it_go/core_ext/string.rb#L37), or open an issue in LetItGo so we can track and freeze more strings.
Keep those strings Frozen
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spelling fix [ci skip]
example to be consistent [ci skip]
grammatical fix
typo fixes [ci skip]
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After this fix application config become available when calling helper outisde of view
config/application.rb
#...
config.asset_host = 'http://mycdn.com'
#...
Somewhere else
ActionController::Base.helpers.asset_path('fallback.png')
# => http://mycdn.com/assets/fallback.png
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Closes #11671
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This is apparently used by the railtie to setup the app helpers paths
correctly between initializers. I'll need to check it further.
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* Avoid calling class_eval when not needed
* Remove helpers_path attr accessor, it's defined as a class attribute a
few lines later
* Avoid creating extra arrays when finding helpers, use flat_map and sort!
* Remove not required refer variable when redirecting :back
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When more than one directory for helpers is provided to a controller, it
should preserver the order of directories. Given 2 paths:
MyController.helpers_paths = ["dir1/helpers", "dir2/helpers"]
helpers from dir1 should be loaded first. Before this commit, all
helpers were mixed and then sorted alphabetically, which essentially
would require to rename helpers to get desired order.
This is a problem especially for engines, where you would like to be
able to predict accurately which engine helpers will load first.
(closes #6496)
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ActionController::Base.all_helpers_from_path public methods
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In older rails versions there was a way to use only helpers from
helper file corresponding to current controller and you could also
include all helpers by saying 'helper :all' in controller. This config
allows to return to older behavior by setting it to false.
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Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>
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Signed-off-by: José Valim <jose.valim@gmail.com>
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engine's ones for controllers inside isolated namespace
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quoting for regexp
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delegates to the config object, reducing the number of deprecations and add specific tests.
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docs I'm working on.
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