Why is Routes.rb not loading the IPs from cache? - ruby-on-rails

Question

I am testing this in local. My ip is 127.0.0.1. The ip_permissions table, is empty. When I browse the site, everything works as expected.
Now, I want to simulate browsing the site with a banned IP. So I add the IP into the ip_permissions table via:
IpPermission.create!(:ip => '127.0.0.1', :note => 'foobar', :category => 'blacklist')
In Rails console, I clear the cache via; Rails.cache.clear. I browse the site. I don't get sent to pages#blacklist.
If I restart the server. And browse the site, then I get sent to pages#blacklist. Why do I need to restart the server every time the ip_permissions table is updated? Shouldn't it fetch it based on cache?
Routes look like:
class BlacklistConstraint
def initialize
#blacklist = IpPermission.blacklist
end
def matches?(request)
#blacklist.map { |b| b.ip }.include? request.remote_ip
end
end
Foobar::Application.routes.draw do
match '/(*path)' => 'pages#blacklist', :constraints => BlacklistConstraint.new
....
end
My model looks like:
class IpPermission < ActiveRecord::Base
validates_presence_of :ip, :note, :category
validates_uniqueness_of :ip, :scope => [:category]
validates :category, :inclusion => { :in => ['whitelist', 'blacklist'] }
def self.whitelist
Rails.cache.fetch('whitelist', :expires_in => 1.month) { self.where(:category => 'whitelist').all }
end
def self.blacklist
Rails.cache.fetch('blacklist', :expires_in => 1.month) { self.where(:category => 'blacklist').all }
end
end

Answer 1

You are initializing BlacklistConstraint in your routes file which is loaded only once at the start. There you call IpPermission.blacklist and store it in an instance variable. Initialize is not called anymore and therefore you check against the same records.
You should load the records on each request if you want them to be updated:
class BlacklistConstraint
def blacklist
IpPermission.blacklist
end
def matches?(request)
blacklist.map { |b| b.ip }.include? request.remote_ip
end
end