Fix Performance/Detect offences

It encourages using `.find` instead of `select {...}.first`

.rubocop_todo.yml

@@ -289,17 +289,6 @@ Performance/DeleteSuffix:
     - 'ee/app/models/geo/upload_registry.rb'
     - 'ee/app/workers/geo/file_download_dispatch_worker/attachment_job_finder.rb'
 
-# Offense count: 13
-# Cop supports --auto-correct.
-Performance/Detect:
-  Exclude:
-    - 'ee/spec/controllers/projects/dependencies_controller_spec.rb'
-    - 'ee/spec/requests/api/dependencies_spec.rb'
-    - 'qa/qa/runtime/feature.rb'
-    - 'spec/lib/gitlab/git/tree_spec.rb'
-    - 'spec/lib/gitlab/import_export/project/tree_restorer_spec.rb'
-    - 'spec/models/event_spec.rb'
-
 # Offense count: 121
 Performance/MethodObjectAsBlock:
   Enabled: false

ee/spec/controllers/projects/dependencies_controller_spec.rb

@@ -147,7 +147,7 @@ RSpec.describe Projects::DependenciesController do
                 end
 
                 it 'returns vulnerability params' do
-                  dependency = json_response['dependencies'].select { |dep| dep['name'] == 'nokogiri' }.first
+                  dependency = json_response['dependencies'].find { |dep| dep['name'] == 'nokogiri' }
                   vulnerability = dependency['vulnerabilities'].first
                   path = "/security/vulnerabilities/#{finding.vulnerability_id}"
 
@@ -182,7 +182,7 @@ RSpec.describe Projects::DependenciesController do
           end
 
           it 'include license information to response' do
-            nokogiri = json_response['dependencies'].select { |dep| dep['name'] == 'nokogiri' }.first
+            nokogiri = json_response['dependencies'].find { |dep| dep['name'] == 'nokogiri' }
 
             expect(nokogiri['licenses']).not_to be_empty
           end

ee/spec/requests/api/dependencies_spec.rb

@@ -37,7 +37,7 @@ RSpec.describe API::Dependencies do
       end
 
       it 'returns vulnerabilities info' do
-        vulnerability = json_response.select { |dep| dep['name'] == 'nokogiri' }[0]['vulnerabilities'][0]
+        vulnerability = json_response.find { |dep| dep['name'] == 'nokogiri' }['vulnerabilities'][0]
         path = "/security/vulnerabilities/#{finding.vulnerability_id}"
 
         expect(vulnerability['name']).to eq('Vulnerabilities in libxml2 in nokogiri')

spec/lib/gitlab/git/tree_spec.rb

@@ -43,7 +43,7 @@ RSpec.describe Gitlab::Git::Tree, :seed_helper do
     end
 
     describe '#dir?' do
-      let(:dir) { entries.select(&:dir?).first }
+      let(:dir) { entries.find(&:dir?) }
 
       it { expect(dir).to be_kind_of Gitlab::Git::Tree }
       it { expect(dir.id).to eq('3c122d2b7830eca25235131070602575cf8b41a1') }
@@ -134,7 +134,7 @@ RSpec.describe Gitlab::Git::Tree, :seed_helper do
     end
 
     describe '#file?' do
-      let(:file) { entries.select(&:file?).first }
+      let(:file) { entries.find(&:file?) }
 
       it { expect(file).to be_kind_of Gitlab::Git::Tree }
       it { expect(file.id).to eq('dfaa3f97ca337e20154a98ac9d0be76ddd1fcc82') }
@@ -143,21 +143,21 @@ RSpec.describe Gitlab::Git::Tree, :seed_helper do
     end
 
     describe '#readme?' do
-      let(:file) { entries.select(&:readme?).first }
+      let(:file) { entries.find(&:readme?) }
 
       it { expect(file).to be_kind_of Gitlab::Git::Tree }
       it { expect(file.name).to eq('README.md') }
     end
 
     describe '#contributing?' do
-      let(:file) { entries.select(&:contributing?).first }
+      let(:file) { entries.find(&:contributing?) }
 
       it { expect(file).to be_kind_of Gitlab::Git::Tree }
       it { expect(file.name).to eq('CONTRIBUTING.md') }
     end
 
     describe '#submodule?' do
-      let(:submodule) { entries.select(&:submodule?).first }
+      let(:submodule) { entries.find(&:submodule?) }
 
       it { expect(submodule).to be_kind_of Gitlab::Git::Tree }
       it { expect(submodule.id).to eq('79bceae69cb5750d6567b223597999bfa91cb3b9') }

spec/lib/gitlab/import_export/project/tree_restorer_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 def match_mr1_note(content_regex)
-  MergeRequest.find_by(title: 'MR1').notes.select { |n| n.note.match(/#{content_regex}/)}.first
+  MergeRequest.find_by(title: 'MR1').notes.find { |n| n.note.match(/#{content_regex}/) }
 end
 
 RSpec.describe Gitlab::ImportExport::Project::TreeRestorer do
@@ -75,7 +75,7 @@ RSpec.describe Gitlab::ImportExport::Project::TreeRestorer do
           context 'for an Issue' do
             it 'does not import note_html' do
               note_content = 'Quo reprehenderit aliquam qui dicta impedit cupiditate eligendi'
-              issue_note = Issue.find_by(description: 'Aliquam enim illo et possimus.').notes.select { |n| n.note.match(/#{note_content}/)}.first
+              issue_note = Issue.find_by(description: 'Aliquam enim illo et possimus.').notes.find { |n| n.note.match(/#{note_content}/) }
 
               expect(issue_note.note_html).to match(/#{note_content}/)
             end
@@ -552,7 +552,7 @@ RSpec.describe Gitlab::ImportExport::Project::TreeRestorer do
 
         it 'issue system note metadata restored successfully' do
           note_content = 'created merge request !1 to address this issue'
-          note = project.issues.first.notes.select { |n| n.note.match(/#{note_content}/)}.first
+          note = project.issues.first.notes.find { |n| n.note.match(/#{note_content}/)}
 
           expect(note.noteable_type).to eq('Issue')
           expect(note.system).to eq(true)

spec/models/event_spec.rb

@@ -706,7 +706,7 @@ RSpec.describe Event do
 
     describe '.for_wiki_meta' do
       it 'finds events for a given wiki page metadata object' do
-        event = events.select(&:wiki_page?).first
+        event = events.find(&:wiki_page?)
 
         expect(described_class.for_wiki_meta(event.target)).to contain_exactly(event)
       end