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Time instances can have fractional parts smaller than a nanosecond.
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Mirrors the DateTime#sec_fraction method by returning the fraction
of the second as a Rational.
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`DateTime#getlocal` is newly added public API.
It's responsible is same as `DateTime#utc`, so `calculations.rb` is
a best plase to define this method.
For keeping consistency with `DateTime#utc`, defines `#localtime` and
defines `getlocal` as an alias method.
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In Ruby 2.4 the `to_time` method for both `DateTime` and `Time` will
preserve the timezone of the receiver when converting to an instance
of `Time`. Since Rails 5.0 will support Ruby 2.2, 2.3 and later we
need to introduce a compatibility layer so that apps that upgrade do
not break. New apps will have a config initializer file that defaults
to match the new Ruby 2.4 behavior going forward.
For information about the changes to Ruby see:
https://bugs.ruby-lang.org/issues/12189
https://bugs.ruby-lang.org/issues/12271
Fixes #24617.
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Slight refactor to improve boot performance on some Ruby
implementations (for now).
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Further investigation seems to disprove that backtracking is the
reason why the positive variant is slower, see
https://github.com/rails/rails/pull/24658#issuecomment-213079710
so, just say nothing about it, only assert it is slower.
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Without the `wdm` gem, it appears that `listen` keeps an open handle to
each of these files, causing them not to be removed when the tempdir
tries to clean iteslf up, and then directory to fail to unlink. In
addition to fixing that particular failure, we now construct OS agnostic
paths, and capture exceptions if the directory fails to unlink so that
minitest will report it rather than crash
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When you come here without context, it is important to hightlight that
checking the predicate is worthwhile due to the observation that blank
strings are often empty. So you complicate the code (which has a cost
in terms of readability and aesthetics), but statistically makes sense.
Then, you also need to explain why the second operand is so convoluted.
Otherwise, you wonder why this line is written precisely this way. That
is what code comments are for.
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Remove unused `BLANK_RE`
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Follow up to #24658.
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This commit updates `delegate` to use the keyword argument syntax added in Ruby 2. I left the `ArgumentError` when `to` is missing, because it better explains how to correctly use `delegate`. We could instead rely on the default `ArgumentError` that would be raised if `to` were a required keyword argument.
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Follow up on https://github.com/rails/rails/commit/697384df36a939e565b7c08725017d49dc83fe40#commitcomment-17184696.
The regex to detect a blank string `/\A[[:space:]]*\z/` will loop through every character in the string to ensure that all of them are a `:space:` type. We can invert this logic and instead look for any non-`:space:` characters. When that happens, we would return on the first character found and the regex engine does not need to keep looking.
Thanks @nellshamrell for the regex talk at LSRC.
By defining a "blank" string as any string that does not have a non-whitespace character (yes, double negative) we can get a substantial speed bump.
Also an inline regex is (barely) faster than a regex in a constant, since it skips the constant lookup. A regex literal is frozen by default.
```ruby
require 'benchmark/ips'
def string_generate
str = " abcdefghijklmnopqrstuvwxyz\t".freeze
str[rand(0..(str.length - 1))] * rand(0..23)
end
strings = 100.times.map { string_generate }
ALL_WHITESPACE_STAR = /\A[[:space:]]*\z/
Benchmark.ips do |x|
x.report('current regex ') { strings.each {|str| str.empty? || ALL_WHITESPACE_STAR === str } }
x.report('+ instead of * ') { strings.each {|str| str.empty? || /\A[[:space:]]+\z/ === str } }
x.report('not a non-whitespace char') { strings.each {|str| str.empty? || !(/[[:^space:]]/ === str) } }
x.compare!
end
# Warming up --------------------------------------
# current regex
# 1.744k i/100ms
# not a non-whitespace char
# 2.264k i/100ms
# Calculating -------------------------------------
# current regex
# 18.078k (± 8.9%) i/s - 90.688k
# not a non-whitespace char
# 23.580k (± 7.1%) i/s - 117.728k
# Comparison:
# not a non-whitespace char: 23580.3 i/s
# current regex : 18078.2 i/s - 1.30x slower
```
This makes the method roughly 30% faster `(23.580 - 18.078)/18.078 * 100`.
cc/ @fxn
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See the rationale in the comment in this patch.
To benchmark this I ran a number of variations, ultimately narrowing to
require 'benchmark/ips'
str = ''
regexp = /\A[[:space:]]*\z/
Benchmark.ips do |x|
x.report('regexp') { regexp === str }
x.report('empty') { str.empty? || regexp === str }
x.compare!
end
This benchmark has consistently reported speedups around 3.5x:
Calculating -------------------------------------
regexp 69.197k i/100ms
empty 115.468k i/100ms
-------------------------------------------------
regexp 2. 6.3%) i/s - 13.839M
empty 9. 8.8%) i/s - 47.804M
Comparison:
empty: 9642607.6 i/s
regexp: 2768351.9 i/s - 3.48x slower
Sometimes even reaching 4x.
Running the same bechmark on strings of 10 or 100 characters (with
whitespace or present) has shown a slowdown of just about 1.01/1.02.
Marginal, we seem to have a worthwhile trade-off here.
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Add ActiveSupport::TimeZone.country_zones helper
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That helper will return time zones for any country that tzdata knows about.
So it will be much simpler for non-US people to list own country time zones
in HTML selects or anywhere.
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Update 'foo'.to_xml(lambda { |options, key| options[:builder].b(key) })
to {foo: lambda { |options, key| options[:builder].b(key) }}.to_xml
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Raise `ArgumentError` when an invalid form is passed to `Date#to_time`
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Before this commit
`NoMethodError: undefined method `form_name' for Time:Class` is raised
when an invalid argument is passed.
It is better to raise `ArgumentError` and show list of valid arguments
to developers.
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Ruby 2.4 introduces `Array#sum`, but it only supports numeric elements,
breaking our `Enumerable#sum` which supports arbitrary `Object#+`.
To fix, override `Array#sum` with our compatible implementation.
Native Ruby 2.4:
%w[ a b ].sum
# => TypeError: String can't be coerced into Fixnum
With `Enumerable#sum` shim:
%w[ a b ].sum
# => 'ab'
We tried shimming the fast path and falling back to the compatible path
if it fails, but that ends up slower even in simple causes due to the cost
of exception handling. Our only choice is to override the native `Array#sum`
with our `Enumerable#sum`.
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```ruby
ActiveSupport::Duration.parse('P3Y6M4DT12H30M5S')
(3.years + 3.days).iso8601
```
Inspired by Arnau Siches' [ISO8601 gem](https://github.com/arnau/ISO8601/)
and rewritten by Andrey Novikov with suggestions from Andrew White. Test
data from the ISO8601 gem redistributed under MIT license.
(Will be used to support the PostgreSQL interval data type.)
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Fix forced cache miss for fetch when called without a block.
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- Raised an argument error if no block is passed to #fetch with
'force: true' option is set.
- Added tests for the same.
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Document consistency [ci skip]
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Introduce weeks and hours periods to Duration.
Change 1.week to create a 1 week duration instead of 7 days and 1.hour
to create a 1 hour duration instead of 3600 seconds.
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This is just to remove astonishment from getting `3600 seconds` from typing `1.hour`.
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Specify that behavior will be deprecated in Rails 5.1
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Restore Hash#transform_keys behavior to always return a Hash instance
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We are using compare_without_coercion.
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Lesser '.' objects for number helpers
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do the same string manipulation. This was we avoid the duplicate strings with freeze and append modifies existing string
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iteration of calling the helper. Eases on some memory bloat
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Note that the fact that mtimes in the future are ignore was documented
just a few lines above. Since we know this has to be done, and the code
is quite clear due to variable naming, I think we can get rid of the
comment in the middle of the loop and shorten it even further.
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ActiveSupport::FileUpdateChecker#max_mtime
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- we are ending sentences properly
- fixing of space issues
- fixed continuity issues in some sentences.
Reverts https://github.com/rails/rails/commit/8fc97d198ef31c1d7a4b9b849b96fc08a667fb02 .
This change reverts making sure we add '.' at end of deprecation sentences.
This is to keep sentences within Rails itself consistent and with a '.' at the end.
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Clean up after a failure in a run callback
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