WIP - adding a generic entity serializer that should accept a Hash coming from Arel

app/serializers/analytics_generic_entity.rb

+class AnalyticsGenericEntity < Grape::Entity
+  include RequestAwareEntity
+  include ActionView::Helpers::DateHelper
+
+
+  expose :title
+  expose :iid
+  expose :started_at, as: :date
+  expose :author, using: UserEntity
+
+  expose :total_time do |object|
+    distance_of_time_in_words(object[:total_time].to_f)
+  end
+
+  expose(:date) do |object|
+    interval_in_words(object[:created_at])
+  end
+
+  expose :url do |object|
+    url_to("namespace_project_#{object[:entity]}".to_sym, id: object[:iid].to_s)
+  end
+
+  private
+
+  def url_to(route, id = nil)
+    public_send("#{route}_url", options[:project].namespace, options[:project], id)
+  end
+
+  def interval_in_words(diff)
+    "#{distance_of_time_in_words(diff.to_f)} ago"
+  end
+end

app/serializers/analytics_generic_serializer.rb

+class AnalyticsGenericSerializer < BaseSerializer
+  entity AnalyticsGenericEntity
+end

spec/serializers/analytics_generic_entity_spec.rb

+require 'spec_helper'
+
+describe AnalyticsGenericEntity do
+  let(:user) { create(:user) }
+  let(:entity_hash) {
+    {
+      total_time: "172802.724419",
+      title: "Eos voluptatem inventore in sed.",
+      iid: "1",
+      id: "1",
+      created_at: "2016-11-12 15:04:02.948604",
+      author: user,
+      entity: :merge_request
+    }
+  }
+
+  let(:project) { create(:empty_project) }
+
+  let(:entity) do
+    described_class.new(entity_hash, request: double, project: project)
+  end
+
+  context 'generic entity' do
+    subject { entity.as_json }
+
+    it 'contains the entity URL' do
+      expect(subject).to include(:url)
+    end
+
+    it 'contains the author' do
+      expect(subject).to include(:author)
+    end
+
+    it 'does not contain sensitive information' do
+      expect(subject).not_to include(/token/)
+      expect(subject).not_to include(/variables/)
+    end
+  end
+end

spec/serializers/analytics_generic_serializer_spec.rb

+require 'spec_helper'
+
+describe AnalyticsBuildSerializer do
+  let(:serializer) do
+    described_class
+      .new(project: project)
+      .represent(resource)
+  end
+
+  let(:json) { serializer.as_json }
+  let(:project) { create(:project) }
+  let(:resource) { create(:ci_build) }
+
+  context 'when there is a single object provided' do
+    it 'it generates payload for single object' do
+      expect(json).to be_an_instance_of Hash
+    end
+
+    it 'contains important elements of analyticsBuild' do
+      expect(json)
+        .to include(:name, :branch, :short_sha, :date, :total_time, :url, :branch_url, :commit_url, :author)
+    end
+  end
+end