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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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When a route was defined within an optional scope, if that route didn't
take parameters the scope was lost when using path helpers. This patch
ensures scope is kept both when the route takes parameters or when it
doesn't.
Fixes #33219
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In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.
```ruby
# frozen_string_literal: true
require "bundler/inline"
gemfile(true) do
source "https://rubygems.org"
gem "benchmark-ips"
end
Benchmark.ips do |x|
x.report('+@') { +"" }
x.report('dup') { "".dup }
x.compare!
end
```
```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
+@ 282.289k i/100ms
dup 187.638k i/100ms
Calculating -------------------------------------
+@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s
dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s
Comparison:
+@: 6775299.3 i/s
dup: 3320400.7 i/s - 2.04x slower
```
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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We want to avoid terminating the whole loop here, because it will cause
parameters that should be removed to not be removed, since we are
terminating early. In this specific case, `param2` is processed before
`param1` due to the reversing of `route.parts`, and since `param2` fails
the check on this line, it would previously cause the whole loop to
fail, and `param1` would still be in `parameterized_parts`. Now, we are
simply calling `next`, which is the intended behavior.
Introduced by 8ca8a2d773b942c4ea76baabe2df502a339d05b1.
Fixes #27454.
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Scoring routes based on constraints repeated many type conversions that
could be performed in the outer loop. Determinations of score and
fitness also used Array operations that required allocations. Against
my benchmark with a large routeset, this reduced object allocations by
over 30x and wall time by over 3x.
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There were never public API only there by mistake.
[ci skip]
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Currently a misleading "missing required keys" error is thrown when a param
fails to match the constraints of a particular route. This commit ensures that
these params are recognised as unmatching rather than missing.
Note: this means that a different error message will be provided between
optimized and non-optimized path helpers, due to the fact that the former does
not check constraints when matching routes.
Fixes #26470.
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Style/SpaceBeforeBlockBraces
Style/SpaceInsideBlockBraces
Style/SpaceInsideHashLiteralBraces
Fix all violations in the repository.
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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 longstanding convention in Rails is that if the :action parameter
is missing or nil then it defaults to 'index'. Up until Rails 5.0.0.beta1
this was handled slightly differently than other routing defaults by
deleting it from the route options and adding it to the recall parameters.
With the recent focus of removing unnecessary duplications this has
exposed a problem in this strategy - we are now mutating the request's
path parameters and causing problems for later url generation. This will
typically affect url_for rather a named url helper since the latter
explicitly pass :controller, :action, etc.
The fix is to add a default for :action in the route class if the path
contains an :action segment and no default is passed. This change also
revealed an issue with the parameterized part expiry in that it doesn't
follow a right to left order - as soon as a dynamic segment is required
then all other segments become required.
Fixes #23019.
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Commit bff61ba, while reducing allocations, caused a regression when an empty
format is passed to a route.
This can happen in cases where you're using an anchor tag, for example:
`https://example.com/parent/575256966.#child_1032289285`.
Because of this change `format` was getting sent in
`parameterized_parts` when previously it was not included. This resulted
in blank `format`'s being returned as `.` when if there was an extension
included it would be `.extension`. Since there was no extension this
caused incorrect URL's.
The test shows this would result in `/posts/show/1.` instead of
`/posts/show/1` which causes bad urls since the format is not present.
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The outer router object already keeps a hash of named routes, so we
should just use that.
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```
empty_array = []
small_array = [1] * 30
bigger_array = [1] * 300
Benchmark.ips do |x|
x.report('empty !empty?') { !empty_array.empty? }
x.report('small !empty?') { !small_array.empty? }
x.report('bigger !empty?') { !bigger_array.empty? }
x.report('empty any?') { empty_array.any? }
x.report('small any?') { small_array.any? }
x.report('bigger any?') { bigger_array.any? }
end
```
```
Calculating -------------------------------------
empty !empty? 132.059k i/100ms
small !empty? 133.974k i/100ms
bigger !empty? 133.848k i/100ms
empty any? 106.924k i/100ms
small any? 85.525k i/100ms
bigger any? 86.663k i/100ms
-------------------------------------------------
empty !empty? 8.522M (± 7.9%) i/s - 42.391M
small !empty? 8.501M (± 8.5%) i/s - 42.202M
bigger !empty? 8.434M (± 8.6%) i/s - 41.894M
empty any? 4.161M (± 8.3%) i/s - 20.743M
small any? 2.654M (± 5.2%) i/s - 13.256M
bigger any? 2.642M (± 6.4%) i/s - 13.173M
```
Ref: https://github.com/rails/rails/pull/21057#discussion_r35902468
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It is slightly faster:
```
Calculating -------------------------------------
each; delete 35.166k i/100ms
delete_if 36.416k i/100ms
-------------------------------------------------
each; delete 478.026k (± 8.5%) i/s - 2.391M
delete_if 485.123k (± 7.9%) i/s - 2.440M
```
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We don't always need an array when generating a url with the formatter. We can be lazy about allocating the `missing_keys` array. This saves us:
35,606 bytes and 889 objects per request
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THe only reason we were allocating an array is to get the "missing_keys" variable in scope of the error message generator. Guess what? Arrays kinda take up a lot of memory, so by replacing that with a nil, we save:
35,303 bytes and 886 objects per request
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When `defaults[key]` in `generate` in the journey formatter is called, it often returns a `nil` when we call `to_s` on a nil, it allocates an empty string. We can skip this check when the default value is nil.
This change buys us 35,431 bytes of memory and 887 fewer objects per request.
Thanks to @matthewd for help with the readability
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Most routes have a `route.path.requirements[key]` of `/[-_.a-zA-Z0-9]+\/[-_.a-zA-Z0-9]+/` yet every time this method is called a new regex is generated on the fly with `/\A#{DEFAULT_INPUT}\Z/`. OBJECT ALLOCATIONS BLERG!
This change uses a special module that implements `===` so it can be used in a case statement to pull out the default input. When this happens, we use a pre-generated regex.
This change buys us 1,643,465 bytes of memory and 7,990 fewer objects per request.
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Micro optimization: `reverse.drop_while` is slower than `reverse_each.drop_while`. This doesn't save any object allocations.
Second, `keys_to_keep` is typically a very small array. The operation `parameterized_parts.keys - keys_to_keep` actually allocates two arrays. It is quicker (I benchmarked) to iterate over each and check inclusion in array manually.
This change buys us 1774 fewer objects per request
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it is avoid sort errot within different and mixed keys.
used `sort_by` + `block` to list parameter by keys.
keep minimum changes
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If the route set is empty, or if none of the routes matches with a score > 0,
there is no point showing the deprecation message because we are already be
raising the `ActionController::UrlGenerationError` mentioned in the warning.
In this case it is the expected behavior and the user wouldn't have to take any
actions.
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The internal tests that (incorrectly) relied on this were already fixed in
938d130. However, we cannot simply fix this bug because the guides prior to
b7b9e92 recommended a workaround that relies on this buggy behavior.
Reference #17453
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"recall" is a terrible name. This variable contains the parameters that
we got from the path (e.g. for "/posts/1" it has :controller => "posts",
:id => "1"). Since it contains the parameters we got from the path,
"path_parameters" is a better name. We always pass path_parameters to
`generate`, so lets make it required.
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Nobody uses this private method, maybe it is a leftover from some old
refactoring. Let's delete it.
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Rename `stack` to `queue`
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Because it is used as a queue (FIFO), not as a stack (LIFO).
* http://en.wikipedia.org/wiki/Stack_(abstract_data_type)
* http://en.wikipedia.org/wiki/Queue_(data_structure)
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Remove unnecessary `Hash#to_a` call
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Inspired by https://github.com/rails/rails/commit/931ee4186b877856b212b0085cd7bd7f6a4aea67
```ruby
def stat(num)
start = GC.stat(:total_allocated_object)
num.times { yield }
total_obj_count = GC.stat(:total_allocated_object) - start
puts "#{total_obj_count / num} allocations per call"
end
h = { 'x' => 'y' }
stat(100) { h. each { |pair| pair } }
stat(100) { h.to_a.each { |pair| pair } }
__END__
1 allocations per call
2 allocations per call
```
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The array is sorted in descending order, so there is no point in
iterating further if we met a negative item - all the rest will be
negative too.
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When an optimized helper fails to generate, show the full route constraints
in the error message. Previously it would only show the contraints that were
required as part of the path.
Fixes #13592
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When generating an unnamed url (i.e. using `url_for` with an options
hash) we should skip anything other than standard Rails routes otherwise
it will match the first mounted application or redirect and generate a
url with query parameters rather than raising an error if the options
hash doesn't match any defined routes.
Fixes #8018
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It'd be a nice convention to mark the unused variables like this, now that Ruby 2 will issue no warnings for such vars being unused.
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Now that Journey has been integrated into ActionDispatch we can raise
the exception ActionController::UrlGenerationError directly rather than
raising the internal Journey::Router::RoutingError and then have
ActionDispatch::Routing::RouteSet#generate re-raise the exception.
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