BitBuckpet importer. Refactoring. Iteration 2

app/controllers/import/bitbucket_controller.rb

@@ -62,7 +62,7 @@ class Import::BitbucketController < Import::BaseController
   end
 
   def provider
-    Gitlab.config.omniauth.providers.find { |provider| provider.name == 'bitbucket' }
+    Gitlab::OAuth::Provider.config_for('bitbucket')
   end
 
   def options

lib/bitbucket/client.rb

@@ -13,11 +13,9 @@ module Bitbucket
 
     def issue_comments(repo, issue_id)
       path = "/repositories/#{repo}/issues/#{issue_id}/comments"
-      paginator = Paginator.new(connection, path, :url)
+      paginator = Paginator.new(connection, path, :comment)
 
-      Collection.new(paginator).map do |comment_url|
-        Representation::Comment.new(connection.get(comment_url.to_s))
-      end
+      Collection.new(paginator)
     end
 
     def pull_requests(repo)

lib/bitbucket/page.rb

@@ -18,14 +18,12 @@ module Bitbucket
     private
 
     def parse_attrs(raw)
-      attrs = %w(size page pagelen next previous)
-      attrs.map { |attr| { attr.to_sym => raw[attr] } }.reduce(&:merge)
+      raw.slice(*%w(size page pagelen next previous)).symbolize_keys
     end
 
     def parse_values(raw, bitbucket_rep_class)
       return [] unless raw['values'] && raw['values'].is_a?(Array)
-
-      raw['values'].map { |hash| bitbucket_rep_class.new(hash) }
+      bitbucket_rep_class.decorate(raw['values'])
     end
 
     def representation_class(type)

lib/bitbucket/paginator.rb

@@ -26,12 +26,12 @@ module Bitbucket
       page.nil? || page.next?
     end
 
-    def page_url
+    def next_url
       page.nil? ? url : page.next
     end
 
     def fetch_next_page
-      parsed_response = connection.get(page_url)
+      parsed_response = connection.get(next_url)
       Page.new(parsed_response, type)
     end
   end

lib/bitbucket/representation/base.rb

@@ -5,6 +5,10 @@ module Bitbucket
         @raw = raw
       end
 
+      def self.decorate(entries)
+        entries.map { |entry| new(entry)}
+      end
+
       private
 
       attr_reader :raw

lib/bitbucket/representation/url.rb

@@ -1,9 +0,0 @@
-module Bitbucket
-  module Representation
-    class Url < Representation::Base
-      def to_s
-        raw.dig('links', 'self', 'href')
-      end
-    end
-  end
-end

lib/gitlab/bitbucket_import/importer.rb

@@ -50,6 +50,13 @@ module Gitlab
 
           if issue.persisted?
             client.issue_comments(repo, issue.iid).each do |comment|
+              # The note can be blank for issue service messages like "Chenged title: ..."
+              # We would like to import those comments as well but there is no any
+              # specific parameter that would allow to process them, it's just an empty comment.
+              # To prevent our importer from just crashing or from creating useless empty comments
+              # we do this check.
+              next unless comment.note.present?
+
               note = @formatter.author_line(comment.author)
               note += comment.note