There is no reason to create an instance variable as we don't pass this
to the view. Further, by adding this as a before_action there's a
disconnect in logic.
This commit attempts to address those issues.
What follows is a three-fold change:
1. Removing the before action (let's just call the method)
2. Reworking the method to reduce, just a bit, the method cost
3. Removing an unused instance variable
Here are the benchmarks. Note the "follows_limit" as written below is
the "Proposed" route.
```ruby
require 'benchmark'
def follows_limit_original(params:, default: 80, max: 1000)
per_page = (params[:per_page] || default).to_i
@follows_limit = [per_page, max].min
end
def follows_limit(params:, default: 80, max: 1000)
return default unless params.key?(:per_page)
per_page = params[:per_page].to_i
return max
per_page
end
def follows_limit_alt(params:, default: 80, max: 1000)
per_page = params.fetch(:per_page, default).to_i
return max if per_page > max
per_page
end
TIMES = 10_000
Benchmark.bmbm do |b|
b.report("Original no params") { 1000.times { follows_limit_original(params: {}) } }
b.report("Original less than max") { 1000.times { follows_limit_original(params: {per_page: 90 }) } }
b.report("Original greater than max") { 1000.times { follows_limit_original(params: {per_page: 9000 }) } }
b.report("Proposed no params") { 1000.times { follows_limit(params: {}) } }
b.report("Proposed less than max") { 1000.times { follows_limit(params: {per_page: 90 }) } }
b.report("Proposed greater than max") { 1000.times { follows_limit(params: {per_page: 9000 }) } }
b.report("Alt no params") { 1000.times { follows_limit_alt(params: {}) } }
b.report("Alt less than max") { 1000.times { follows_limit_alt(params: {per_page: 90 }) } }
b.report("Alt greater than max") { 1000.times { follows_limit_alt(params: {per_page: 9000 }) } }
end
```
```shell
$ ruby /Users/jfriesen/git/forem/bench.rb
Rehearsal -------------------------------------------------------------
Original no params 0.000403 0.000002 0.000405 ( 0.000405)
Original less than max 0.000109 0.000005 0.000114 ( 0.000114)
Original greater than max 0.000161 0.000006 0.000167 ( 0.000166)
Proposed no params 0.000076 0.000001 0.000077 ( 0.000076)
Proposed less than max 0.000114 0.000009 0.000123 ( 0.000126)
Proposed greater than max 0.000112 0.000011 0.000123 ( 0.000123)
Alt no params 0.000104 0.000007 0.000111 ( 0.000114)
Alt less than max 0.000113 0.000009 0.000122 ( 0.000122)
Alt greater than max 0.000111 0.000001 0.000112 ( 0.000115)
---------------------------------------------------- total: 0.001354sec
user system total real
Original no params 0.000108 0.000000 0.000108 ( 0.000110)
Original less than max 0.000109 0.000001 0.000110 ( 0.000111)
Original greater than max 0.000109 0.000000 0.000109 ( 0.000109)
Proposed no params 0.000071 0.000000 0.000071 ( 0.000071)
Proposed less than max 0.000103 0.000001 0.000104 ( 0.000103)
Proposed greater than max 0.000102 0.000000 0.000102 ( 0.000103)
Alt no params 0.000093 0.000000 0.000093 ( 0.000093)
Alt less than max 0.000103 0.000000 0.000103 ( 0.000104)
Alt greater than max 0.000102 0.000000 0.000102 ( 0.000103)
```
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