More sugar in controller helpers for handling custom version logic?

[bwillis]

I bump an API version, but I have logic that needs to run for the new version only. There is currently a supported interface with requested_version, but we want to explore some other options that might be a little more elegant.

Example:

class UserController < ApplicationController

  def index
    if requested_version >= 5
      ...
    elsif requested_version >= 3
      ...
    elsif requested_version == 2
      ...
    else
      ...
    end
  end

end

[bwillis]

Moving from conversation over here: 3dbdaf6#commitcomment-1847368
Bundler style

  if api ">= v5"
    ...
  elsif api "v3..v4" # or api(2..4) ?
    ...
  elsif api_v2?
    ...
  else
  end

Arel style

  if api.greater_than(5)
    ... 
  elsif api.between(3).and(4)
    ...
  elsif api.eq(2)
    ...
  else
    ...
  end

Forward/backward compatible dynamic versioners

  if forwards_compatible_from_v5?
    ...
  elsif compatible_from_v3_through_v4?
    ...
  elsif backwards_compatible_from_v2?
    ...
  end

respond_to block

supported_versions = (1..10)
versions_for do |version|
  version.is_v5 # >5
  version.is_v3 # 3,4
  version.is_v1 # 1
end

[bwillis]

Closing until we have a better use case.