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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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Previously, calling `User.model_name.to_json` would result in an infinite
recursion as `.model_name` inherited its `.as_json` behavior from Object. This
patch fixes that unexpected behavior by delegating `.as_json` to :name.
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'_singularize' only ever gets called with one argument
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Also prevents the word "Model" from linking to the documentation
of ActiveModel::Model because that's not intended.
[ci skip]
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Use #model_name on instances instead of classes
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This allows rails code to be more confdent when asking for a model name, instead of having to ask for the class.
Rails core discussion here: https://groups.google.com/forum/#!topic/rubyonrails-core/ThSaXw9y1F8
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The instance method `model_name` was being defined multiple times,
causing a redefinition warning.
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According to our guideline, we leave 1 space between `#` and `=>`, so we
want `# =>` instead of `#=>`.
Thanks to @fxn for the suggestion.
[ci skip]
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Minor doc fix of ActiveModel::Naming. [ci skip]
Conflicts:
activemodel/lib/active_model/naming.rb
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- qoute example line's result when it kind of String
- right ("singular_route_key") method in example
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Those two files are required by active_support/rails.rb
loaded in active_model.rb
It is common to require common dependencies on the root
files to avoid boilerplate in each file.
This reverts commit 763635e30f17800ebc0a8ae98d780edc8ebfb4e5, reversing
changes made to 4f46ef36aaef217834f3f96d3689d32f6a6761ea.
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There are two missing ActiveSupport dependencies to use ActiveModel::Name class or ActiveModel::Naming module independently.
Missing dependencies for Module#delegate defined in `active_support/core_ext/module/delegation`, used at [L148](https://github.com/rails/rails/blob/master/activemodel/lib/active_model/naming.rb#L148)
Missing dependencies for Object#blank? defined in `active_support/core_ext/object/blank`, used at [L131](https://github.com/rails/rails/blob/master/activemodel/lib/active_model/naming.rb#L131)
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I also attempted to fix other styleguide violations such as
{ a: :b } over {a: :b} and foo(b: 'bar') over foo( b: 'bar' ).
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Under a "private" call, class methods are not real private methods,
they're public just like any other method.
Make model_name_from_record_or_class a private class method, and nodoc it.
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Conflicts:
activemodel/lib/active_model/secure_password.rb
activerecord/lib/active_record/associations/collection_proxy.rb
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It was deprecated in 3.2
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ActiveModel::Name constructor expects to be able to call #blank? on a
String but the core Object#blank? extension is never required.
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methods directly.
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File#to_path and similar.
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Deprecate ActiveModel::Name#partial_path. Now you
should call #to_path directly on ActiveModel
instances.
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This patch allows to specify the name of your models independent of the class name.
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