| Commit message (Collapse) | Author | Age | Files | Lines |
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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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Where appropriate prefer the more concise Regexp#match?, String#include?,
String#start_with?, and String#end_with?
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And make sure that it doesn't even try to call the method in the target.
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Introduce Module#delegate_missing_to
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When building decorators, a common pattern may emerge:
class Partition
def initialize(first_event)
@events = [ first_event ]
end
def people
if @events.first.detail.people.any?
@events.collect { |e| Array(e.detail.people) }.flatten.uniq
else
@events.collect(&:creator).uniq
end
end
private
def respond_to_missing?(name, include_private = false)
@events.respond_to?(name, include_private)
end
def method_missing(method, *args, &block)
@events.send(method, *args, &block)
end
end
With `Module#delegate_missing_to`, the above is condensed to:
class Partition
delegate_missing_to :@events
def initialize(first_event)
@events = [ first_event ]
end
def people
if @events.first.detail.people.any?
@events.collect { |e| Array(e.detail.people) }.flatten.uniq
else
@events.collect(&:creator).uniq
end
end
end
David suggested it in #23824.
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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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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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This caused a performance regression since we were decided to do the nil
check in run time not in the load time.
See https://github.com/rails/rails/pull/15187#issuecomment-71760058
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Fixes #16956.
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sup haters
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This change breaks tests in activesupport/test/core_ext/module_test.rb:
* test_delegation_exception_backtrace
* test_delegation_exception_backtrace_with_allow_nil
This reverts commit 0167765e3f84260522bc2f32d926c1f5dd44957c.
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any line number maths
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private or protected methods. [ci skip]
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Different Ruby implementations present backtraces differently, as
it should be an information consumed by humans.
A better implementation should use data from the error, in this case
returned by NoMethodError#name.
Fixes issues with Rubinius, which presents backtraces differently from
MRI.
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This fixes situations where nested NoMethodError exceptions are masked
by delegations. This would cause confusion especially where there was a
problem in the Rails booting process because of a delegation in the
routes reloading code.
Fixes #10559
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Create DelegationError class
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and avoids multiple evaluation of the target method
Notes:
1) I hope nilness is a word.
2) See rationale for avoiding multiple evaluation in a comment in the patch, credit goes to @jeremy for pointing out this gotcha in the existing implementation.
3) Embeds a little joke dedicated to @pixeltrix (it could be worse! :D).
References #10347.
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Add documentation and test to delegation method that make sure we're
aware that when a delegated object is not nil or false and doesn't
respond to the method it will still raise a NoMethodError exception.
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Conflicts:
actionmailer/lib/action_mailer/base.rb
activesupport/lib/active_support/configurable.rb
activesupport/lib/active_support/core_ext/module/deprecation.rb
guides/source/action_controller_overview.md
guides/source/active_support_core_extensions.md
guides/source/ajax_on_rails.textile
guides/source/association_basics.textile
guides/source/upgrading_ruby_on_rails.md
While resolving conflicts, I have chosen to ignore changes done in
docrails at some places - these will be most likely 1.9 hash syntax
changes.
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See #7613. [ci skip]
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Remove the use of #__send__ in order to boost performance. This also
means that you can no longer delegate to private methods on the
target object.
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* Refactor log subscriber, use select! to avoid a new object
* Remove deprecation messages related to AS::Deprecation behavior
This was added about 2 years ago for Rails 3:
https://github.com/rails/rails/commit/d4c7d3fd94e5a885a6366eaeb3b908bb58ffd4db
* Remove some not used requires
* Refactor delegate to avoid string conversions and if statements inside each block
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Module#delegate
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don't use exceptions for flow control in the :allow_nil => true case.
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