Address rubocop offenses.

app/models/user_contributed_projects.rb

@@ -7,37 +7,39 @@ class UserContributedProjects < ActiveRecord::Base
 
   CACHE_EXPIRY_TIME = 1.day
 
-  def self.track(event)
-    # For events without a project, we simply don't care.
-    # An example of this is the creation of a snippet (which
-    # is not related to any project).
-    return unless event.project
-
-    # This is a precaution because the cache lookup
-    # will work just fine without an author.
-    #
-    # However, this should never happen (tm).
-    raise 'event#author not present unexpectedly' unless event.author
-
-    attributes = {
-      project_id: event.project_id,
-      user_id: event.author_id
-    }
-
-    cached_exists?(attributes) do
-      begin
-        find_or_create_by!(attributes)
-        true # not caching the whole record here for now
-      rescue ActiveRecord::RecordNotUnique
-        retry
+  class << self
+    def track(event)
+      # For events without a project, we simply don't care.
+      # An example of this is the creation of a snippet (which
+      # is not related to any project).
+      return unless event.project
+
+      # This is a precaution because the cache lookup
+      # will work just fine without an author.
+      #
+      # However, this should never happen (tm).
+      raise 'event#author not present unexpectedly' unless event.author
+
+      attributes = {
+        project_id: event.project_id,
+        user_id: event.author_id
+      }
+
+      cached_exists?(attributes) do
+        begin
+          find_or_create_by!(attributes)
+          true # not caching the whole record here for now
+        rescue ActiveRecord::RecordNotUnique
+          retry
+        end
       end
     end
-  end
 
-  private
+    private
 
-  def self.cached_exists?(project_id:, user_id:, &block)
-    cache_key = "user_contributed_projects:#{project_id}:#{user_id}"
-    Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRY_TIME, &block)
+    def cached_exists?(project_id:, user_id:, &block)
+      cache_key = "user_contributed_projects:#{project_id}:#{user_id}"
+      Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRY_TIME, &block)
+    end
   end
 end

spec/models/user_contributed_projects_spec.rb

 require 'spec_helper'
 
 describe UserContributedProjects do
-
   describe '.track' do
     subject { described_class.track(event) }
     let(:event) { build(:event) }
@@ -10,33 +9,33 @@ describe UserContributedProjects do
       context "for all actions (event types)" do
         let(:event) { build(:event, action: action) }
         it 'creates a record' do
-          expect { subject }.to change { UserContributedProjects.count }.from(0).to(1)
+          expect { subject }.to change { described_class.count }.from(0).to(1)
         end
       end
     end
 
     it 'sets project accordingly' do
       subject
-      expect(UserContributedProjects.first.project).to eq(event.project)
+      expect(described_class.first.project).to eq(event.project)
     end
 
     it 'sets user accordingly' do
       subject
-      expect(UserContributedProjects.first.user).to eq(event.author)
+      expect(described_class.first.user).to eq(event.author)
     end
 
     it 'only creates a record once per user/project' do
       expect do
         subject
         described_class.track(event)
-      end.to change { UserContributedProjects.count }.from(0).to(1)
+      end.to change { described_class.count }.from(0).to(1)
     end
 
     describe 'with an event without a project' do
       let(:event) { build(:event, project: nil) }
 
       it 'ignores the event' do
-        expect { subject }.not_to change { UserContributedProjects.count }
+        expect { subject }.not_to change { described_class.count }
       end
     end
   end