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We sometimes say "✂️ newline after `private`" in a code review (e.g.
https://github.com/rails/rails/pull/18546#discussion_r23188776,
https://github.com/rails/rails/pull/34832#discussion_r244847195).
Now `Layout/EmptyLinesAroundAccessModifier` cop have new enforced style
`EnforcedStyle: only_before` (https://github.com/rubocop-hq/rubocop/pull/7059).
That cop and enforced style will reduce the our code review cost.
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### Summary
There was an issues when using `safe_constantize` on a string that has
the wrong case.
File `em.rb` defines `EM`.
`"Em".safe_constantize` causes a little confusion with the autoloader.
The autoloader finds file "em.rb",
expecting it to define `Em`, but `Em` is not defined.
The autoloader raises a `LoadError`, which is good,
But `safe_constantize` is defined to return `nil` when a class is not found.
### Before
```
"Em".safe_constantize
LoadError: Unable to autoload constant Em, \
expected rails/activesupport/test/autoloading_fixtures/em.rb to define it
```
### After
```
"Em".safe_constantize
# => nil
```
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Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.
* Exclude these files not to auto correct false positive `Regexp#freeze`
- 'actionpack/lib/action_dispatch/journey/router/utils.rb'
- 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.
* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required
- 'actionpack/test/controller/test_case_test.rb'
- 'activemodel/test/cases/type/string_test.rb'
- 'activesupport/lib/active_support/core_ext/string/strip.rb'
- 'activesupport/test/core_ext/string_ext_test.rb'
- 'railties/test/generators/actions_test.rb'
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Ruby 2.4 has native `Regexp#match?`.
https://ruby-doc.org/core-2.4.0/Regexp.html#method-i-match-3F
Related #32034.
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now support translations through I18n.
{
fr: {
number: {
nth: {
ordinals: lambda do |_key, number:, **_options|
if number.to_i.abs == 1
'er'
else
'e'
end
end,
ordinalized: lambda do |_key, number:, **_options|
"#{number}#{ActiveSupport::Inflector.ordinal(number)}"
end
}
}
}
}
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### Summary
This PR changes .rubocop.yml.
Regarding the code using `if ... else ... end`, I think the coding style
that Rails expects is as follows.
```ruby
var = if cond
a
else
b
end
```
However, the current .rubocop.yml setting does not offense for the
following code.
```ruby
var = if cond
a
else
b
end
```
I think that the above code expects offense to be warned.
Moreover, the layout by autocorrect is unnatural.
```ruby
var = if cond
a
else
b
end
```
This PR adds a setting to .rubocop.yml to make an offense warning and
autocorrect as expected by the coding style.
And this change also fixes `case ... when ... end` together.
Also this PR itself is an example that arranges the layout using
`rubocop -a`.
### Other Information
Autocorrect of `Lint/EndAlignment` cop is `false` by default.
https://github.com/bbatsov/rubocop/blob/v0.51.0/config/default.yml#L1443
This PR changes this value to `true`.
Also this PR has changed it together as it is necessary to enable
`Layout/ElseAlignment` cop to make this behavior.
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Cache regexps generated from acronym_regex
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The Problem
-----------
The following line from `String#camelize`:
string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { |match| match.downcase }
and the following line from `String#camelize`:
word.gsub!(/(?:(?<=([A-Za-z\d]))|\b)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1 && '_'.freeze }#{$2.downcase}" }#{$2.downcase}" }
Both generate the same regexep in the first part of the `.sub`/`.gsub`
method calls every time the function is called, creating an extra object
allocation each time. The value of `acronym_regex` only changes if the
user decides add an acronym to the current set of inflections and apends
another string on the the regexp generated here, but beyond that it
remains relatively static.
This has been around since acronym support was introduced back in 2011
in PR#1648.
Proposed Solution
-----------------
To avoid re-generating these strings every time these methods are
called, cache the values of these regular expressions in the
`ActiveSupport::Inflector::Inflections` instance, making it so these
regular expressions are only generated once, or when the acronym's are
added to.
Other notable changes is the attr_readers are nodoc'd, as they shouldn't
really be public APIs for users. Also, the new method,
define_acronym_regex_patterns, is the only method in charge of
manipulating @acronym_regex, and initialize_dup also makes use of that
new change.
** Note about fix for non-deterministic actionpack test **
With the introduction of `@acronym_underscore_regex` and
`@acronym_camelize_regex`, tests that manipulated these for a short
time, then reset them could caused test failures to happen. This
happened because the previous way we reset the `@acronyms` and
`@acronym_regex` was the set them using #instance_variable_set, which
wouldn't run the #define_acronym_regex_patterns method.
This has now been introduced into the actionpack tests to avoid this
failure.
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Acronym inflections are stored with lowercase keys in the hash but
the match wasn't being lowercased before being looked up in the hash.
This shouldn't have any performance impact because before it would
fail to find the acronym and perform the `downcase` operation anyway.
Fixes #31052.
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This basically reverts 8da30ad6be34339124ba4cb4e36aea260dda12bc
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Previously apply_inflections would only use the :en uncountables
rather then the ones for the locale that was passed to pluralize or
singularize.
This changes apply_inflections to take a locale which it will use to
find the uncountables.
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mubashirhanif/add_keep_id_suffix_option_to_humanize_new
Add keep id suffix option to humanize new
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some documentation
remove extra whitespace.
Added id in the middle test case and corrected some testcases.
Some Coding standard guidelines corrections as suggested by codeclimate.
Some more corrections suggested by codeclimate.
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In 4b685aa the regex in `titlelize` was updated to not match
apostrophes to better reflect the nature of the transformation.
Unfortunately this had the side effect of breaking capitalization
on the first word of a sub-string, e.g:
>> "This was 'fake news'".titleize
=> "This Was 'fake News'"
This is fixed by extending the look-behind to also check for a
word character on the other side of the apostrophe.
Fixes #28312.
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In the following situation:
```ruby
class Bar
end
module Baz
end
class Foo
prepend Baz
end
class Foo::Bar
end
```
Running `Inflector.constantize('Foo::Bar')` would blow up with a NameError.
What is happening is that `constatize` was written before the introduction
of prepend, and wrongly assume that `klass.ancestors.first == klass`.
So it uses `klass.ancestors.inject` without arguments, as a result
a prepended module is used in place of the actual class.
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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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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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The exclamation mark is not a metacharacter.
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Where appropriate prefer the more concise Regexp#match?, String#include?,
String#start_with?, and String#end_with?
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[ci skip] Documentation: Switch around a common phrase for readability
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In `apply_inflections` a string is down cased and some whitespace stripped in the front (which allocate strings). This would normally be fine, however `uncountables` is a fairly small array (10 elements out of the box) and this method gets called a TON. Instead we can keep an array of valid regexes for each uncountable so we don't have to allocate new strings.
This change buys us 325,106 bytes of memory and 3,251 fewer objects per request.
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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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```ruby
require 'benchmark/ips'
Benchmark.ips do |x|
x.report("$&") {
"foo".sub(/f/) { $&.upcase }
}
x.report("block var") {
"foo".sub(/f/) {|match| match.upcase }
}
end
```
```
Calculating -------------------------------------
$& 48.658k i/100ms
block var 49.666k i/100ms
-------------------------------------------------
$& 873.156k (± 9.3%) i/s - 4.331M
block var 969.744k (± 9.2%) i/s - 4.818M
```
It's faster, and gets rid of a few "magic" global variables
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Fix the guide to state that Rails uses Minitest as the default test
framework.
Remove unnecessary mention to Test::Unit from the API docs
('constantize' and 'safe_constantize').
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https://github.com/ruby/ruby/pull/579 - there is a new optimization
since ruby 2.2
Previously regexp patterns were faster (since a string was converted to
regexp underneath anyway). But now string patterns are faster and
better reflect the purpose.
Benchmark.ips do |bm|
bm.report('regexp') { 'this is ::a random string'.gsub(/::/, '/') }
bm.report('string') { 'this is ::a random string'.gsub('::', '/') }
bm.compare!
end
# string: 753724.4 i/s
# regexp: 501443.1 i/s - 1.50x slower
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Many methods in ActiveSupport::Inflector were actually documenting
the String methods with the same name.
For instance the doc for `camelize` said:
> If the argument to +camelize+ is set to <tt>:lower</tt>...
while it should say:
> If the +uppercase_first_letter+ parameter is set to false
[ci skip]
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