In helping track down forem/forem#17041 I was looking at our cache
busting logic. We were looking up a constant via the `.const_get` call
from a string already defined inline. This refactor short-circuits
naming a string, capitalizing it, then looking in the class's registered
constants.
There's also a subtle bug in the original; When `provider` equals
"another_cache", the `#capitalize` method would return
`"Another_cache"`, whereas `#classify` will return `"AnotherCache"`.
Below are some benchmarks for the change.
```ruby
require "benchmark"
module EdgeCache
class Bust
def by_class
Fastly
end
def by_const_get
self.class.const_get("fastly".classify)
end
end
end
Benchmark.bmbm do |x|
x.report("by_class") do
1000.times do
EdgeCache::Bust.new.by_class
end
end
x.report("by_const_get") do
1000.times do
EdgeCache::Bust.new.by_const_get
end
end
end
```
```shell
> bin/rails runner /Users/jfriesen/git/forem/bench.rb
Rehearsal ------------------------------------------------
by_class 0.001239 0.000186 0.001425 ( 0.001342)
by_const_get 0.011398 0.000136 0.011534 ( 0.011538)
--------------------------------------- total: 0.012959sec
user system total real
by_class 0.000973 0.000030 0.001003 ( 0.000969)
by_const_get 0.011102 0.000032 0.011134 ( 0.011104)
```
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