Fetch access token each Rake task execution

Author: nalabjp

.travis.yml

@@ -20,4 +20,3 @@ script:
 env:
   global:
     - TZ='Asia/Tokyo'
-    - FACEBOOK_ACCESS_TOKEN='dummy_token'

lib/statistics/client.rb

@@ -111,8 +111,10 @@ def fetch_events(group_id:, since_at: @default_since, until_at: @default_until)
     end
 
     class Facebook
+      class_attribute :access_token
+
       def initialize
-        @client = Koala::Facebook::API.new(ENV.fetch('FACEBOOK_ACCESS_TOKEN'))
+        @client = Koala::Facebook::API.new(self.access_token)
       end
 
       def fetch_events(group_id:, since_at: nil, until_at: nil)

lib/tasks/statistics.rake

@@ -35,6 +35,8 @@ namespace :statistics do
            Time.current.prev_month.end_of_month
          end
 
+    Statistics::Client::Facebook.access_token = Koala::Facebook::OAuth.new(ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_APP_SECRET']).get_app_access_token
+
     EventHistory.where(evented_at: from..to).delete_all
 
     loop.with_object([from]) { |_, list|