Previously memoization in `localtime` wasn't taking the `utc_offset`
parameter into account when returning a cached value. It now caches the
computed value depending on the `utc_offset` parameter, e.g:
Time.zone = "US/Eastern"
t = Time.zone.local(2016,5,2,11)
# => Mon, 02 May 2016 11:00:00 EDT -04:00
t.localtime(-7200)
# => 2016-05-02 13:00:00 -0200
t.localtime(-3600)
# => 2016-05-02 14:00:00 -0100
The Rails test runner supports three ways to run tests: directly, via rake, or ruby.
When Running with Ruby ala `ruby -Itest test/models/post_test.rb` our test file would
be evaluated first, requiring `test_helper` and then `active_support/testing/autorun`
that would then require the test file (which it hadn't been before) thus reevaluating
it. This caused exceptions if using Active Support's declarative syntax.
Fix this by shifting around when we set the how we're run to closer mimick the require
order.
If we're running with `bin/rails test` the test command file is run first and we then
set `run_with_rails_extension`, later we hit `active_support/testing/autorun` and do
nothing — because we've been run elsewhere.
If we at this point haven't set `run_with_rails_extension` we've been running with
`ruby` this whole time and thus we set that.
We should always trigger `Minitest.autorun` as it doesn't hurt to call it twice.
Consolidate the two methods into a single one that better brings out the intent of
why they're there.
Previously calls to `in` were being sent to the non-DST aware
method `Time#since` via `method_missing`. It is now aliased to
the DST aware `ActiveSupport::TimeWithZone#+` which handles
transitions across DST boundaries, e.g:
Time.zone = "US/Eastern"
t = Time.zone.local(2016,11,6,1)
# => Sun, 06 Nov 2016 01:00:00 EDT -05:00
t.in(1.hour)
# => Sun, 06 Nov 2016 01:00:00 EST -05:00
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.
Currently mongrel is not maintained.
And it couldn't be built with any Ruby versions that
supported by Rails.
It is reasonable to remove the word "mongrel" in order to avoid
confusion from newcomer.
Recently, the Rails team made an effort to keep the source code consistent, using Ruboco
(bb1ecdcc677bf6e68e0252505509c089619b5b90 and below). Some of the case
statements were missed.
This changes the case statements' formatting and is consistent with changes
in 810dff7c9fa9b2a38eb1560ce0378d760529ee6b and db63406cb007ab3756d2a96d2e0b5d4e777f8231.
All indentation was normalized by rubocop auto-correct at 80e66cc4d90bf8c15d1a5f6e3152e90147f00772.
But heredocs was still kept absolute position. This commit aligns
heredocs indentation for consistency.
As demonstrated in #25880 the to_time method converts the utc time
instance to a local time instance which is an expensive operation.
Since to_datetime involves similar expensive operations we should
also cache it to speed up comparison with lots of values.
ActiveSupport::Testing::Assertions.
We have a separate module in which have defined Rails' own custom
assertions. So it would be good to keep all custom Rails' assertions in
one place i.e. in this module.
A performance regression was introduced by commit b79adc4323ff289aed3f5787fdfbb9542aa4f89f
from Rails 4.0.0.beta1, in which `TimeWithZone#to_time` no longer returns a
cached instance attribute but instead coerces the value to `Time`. This
coerced value is not cached, and recomputation degrades the performance
of comparisons between TimeWithZone objects.
See b79adc4323 (diff-3497a506c921a3a3e40fd517e92e4fe3R322)
for the change in question.
The following benchmark, which reverts the change linked above, demonstrates
the performance regression:
require 'active_support/time'
require 'benchmark/ips'
utc = Time.utc(2000, 1, 1, 0)
time_zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
twz = ActiveSupport::TimeWithZone.new(utc, time_zone)
twz2 = ActiveSupport::TimeWithZone.new(Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone['UTC'])
patchedTimeWithZone = Class.new(ActiveSupport::TimeWithZone) do
def to_time
utc
end
end
patched_twz = patchedTimeWithZone.new(utc, time_zone)
patched_twz2 = patchedTimeWithZone.new(Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone['UTC'])
Benchmark.ips do |x|
x.report("comparison out of the box") { twz <=> twz2 }
x.report("comparison reverting to_time") { patched_twz <=> patched_twz2 }
x.compare!
end
The results, when run in rails-dev-box, are as follows:
Warming up --------------------------------------
comparison out of the box
24.765k i/100ms
comparison reverting to_time
57.237k i/100ms
Calculating -------------------------------------
comparison out of the box
517.245k (± 4.7%) i/s - 2.600M in 5.038700s
comparison reverting to_time
2.624M (± 5.0%) i/s - 13.050M in 4.985808s
Comparison:
comparison reverting to_time: 2624266.1 i/s
comparison out of the box: 517244.6 i/s - 5.07x slower
The change made to run the benchmark, however, is not possible, as it would
undo the intent to standardize the return value of `to_time` to `Time` in
the system timezone.
Our proposed solution is to restore the caching behaviour of `to_time`
as it existed prior to the change linked above.
Benchmark of our solution:
require 'active_support/time'
require 'benchmark/ips'
patchedTimeWithZone = Class.new(ActiveSupport::TimeWithZone) do
def to_time
@to_time ||= super
end
end
utc = Time.utc(2000, 1, 1, 0)
time_zone = ActiveSupport::TimeZone['Eastern Time (US & Canada)']
twz = ActiveSupport::TimeWithZone.new(utc, time_zone)
twz2 = ActiveSupport::TimeWithZone.new(Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone['UTC'])
patched_twz = patchedTimeWithZone.new(utc, time_zone)
patched_twz2 = patchedTimeWithZone.new(Time.utc(1999, 12, 31, 23, 59, 59), ActiveSupport::TimeZone['UTC'])
Benchmark.ips do |x|
x.report("TimeWithZone comparison - existing implementation") { twz <=> twz2 }
x.report("TimeWithZone comparison - caching implementation") { patched_twz <=> patched_twz2 }
x.compare!
end
Results in rails-dev-box:
Warming up --------------------------------------
TimeWithZone comparison - existing implementation
26.629k i/100ms
TimeWithZone comparison - caching implementation
59.144k i/100ms
Calculating -------------------------------------
TimeWithZone comparison - existing implementation
489.757k (± 4.2%) i/s - 2.450M in 5.011639s
TimeWithZone comparison - caching implementation
2.802M (± 5.3%) i/s - 13.958M in 4.996116s
Comparison:
TimeWithZone comparison - caching implementation: 2801519.1 i/s
TimeWithZone comparison - existing implementation: 489756.7 i/s - 5.72x slower
This code has too much duplication and the rationale for the concatenation
may not be obvious to the reader. You define the ones at class-level, explain
why does the code concatenates there, and then the convenience ones at
instance-level just delegate.
A few have been left for aesthetic reasons, but have made a pass
and removed most of them.
Note that if the method `foo` returns an array, `foo << 1`
is a regular push, nothing to do with assignments, so
no self required.
The current implementation of `thread_mattr_accessor` set variable
sharing superclass with subclass. So the method doesn't work as documented.
Precondition
class Account
thread_mattr_accessor :user
end
class Customer < Account
end
Account.user = "DHH"
Account.user #=> "DHH"
Customer.user = "Rafael"
Customer.user # => "Rafael"
Documented behavior
Account.user # => "DHH"
Actual behavior
Account.user # => "Rafael"
Current implementation set variable statically likes `Thread[:attr_Account_user]`,
and customer also use it.
Make variable name dynamic to use own thread-local variable.
Since 434df00 week durations are no longer converted to days. This means
we need to add :weeks to the parts that ActiveSupport::TimeWithZone will
consider being of variable duration to take account of DST transitions.
Fixes#26039.
