Fix todo offenses for Style/HashTransformKeys

.rubocop_todo.yml

@@ -560,15 +560,6 @@ Style/GuardClause:
 Style/HashEachMethods:
   Enabled: false
 
-# Offense count: 6
-# Cop supports --auto-correct.
-Style/HashTransformKeys:
-  Exclude:
-    - 'ee/app/models/vulnerabilities/occurrence.rb'
-    - 'ee/spec/lib/gitlab/ci/templates/dependency_scanning_gitlab_ci_yaml_spec.rb'
-    - 'lib/banzai/filter/commit_trailers_filter.rb'
-    - 'lib/gitlab/analytics/cycle_analytics/stage_events.rb'
-
 # Offense count: 31
 # Configuration parameters: AllowIfModifier.
 Style/IfInsideElse:

ee/app/models/vulnerabilities/occurrence.rb

@@ -115,8 +115,8 @@ module Vulnerabilities
     end
 
     def self.counted_by_severity
-      group(:severity).count.each_with_object({}) do |(severity, count), accum|
-        accum[SEVERITY_LEVELS[severity]] = count
+      group(:severity).count.transform_keys do |severity|
+        SEVERITY_LEVELS[severity]
       end
     end
 

ee/spec/lib/gitlab/ci/templates/dependency_scanning_gitlab_ci_yaml_spec.rb

@@ -91,7 +91,7 @@ RSpec.describe 'Dependency-Scanning.gitlab-ci.yml' do
 
             context 'with file at depth 1' do
               # prepend a directory to files (e.g. convert go.sum to foo/go.sum)
-              let(:files_at_depth_x) {  Hash[files.map { |k, v| ["foo/#{k}", v]}] }
+              let(:files_at_depth_x) { files.transform_keys { |k| "foo/#{k}"} }
 
               it 'creates a pipeline with the expected jobs' do
                 expect(build_names).to include(*include_build_names)
@@ -100,7 +100,7 @@ RSpec.describe 'Dependency-Scanning.gitlab-ci.yml' do
 
             context 'with file at depth 2' do
               # prepend a directory to files (e.g. convert go.sum to foo/bar/go.sum)
-              let(:files_at_depth_x) {  Hash[files.map { |k, v| ["foo/bar/#{k}", v]}] }
+              let(:files_at_depth_x) { files.transform_keys { |k| "foo/bar/#{k}"} }
 
               it 'creates a pipeline with the expected jobs' do
                 expect(build_names).to include(*include_build_names)
@@ -108,7 +108,7 @@ RSpec.describe 'Dependency-Scanning.gitlab-ci.yml' do
             end
 
             context 'with file at depth > 2' do
-              let(:files_at_depth_x) {  Hash[files.map { |k, v| ["foo/bar/baz/#{k}", v]}] }
+              let(:files_at_depth_x) { files.transform_keys { |k| "foo/bar/baz/#{k}"} }
 
               it 'includes no job' do
                 expect { pipeline }.to raise_error(Ci::CreatePipelineService::CreateError)

lib/banzai/filter/commit_trailers_filter.rb

@@ -144,10 +144,7 @@ module Banzai
       end
 
       def data_attributes_from_hash(data = {})
-        data.reject! {|_, value| value.nil?}
-        data.map do |key, value|
-          [%(data-#{key.to_s.dasherize}), value]
-        end.to_h
+        data.compact.transform_keys { |key| %(data-#{key.to_s.dasherize}) }
       end
     end
   end

lib/gitlab/analytics/cycle_analytics/stage_events.rb

@@ -60,7 +60,7 @@ module Gitlab
 
         # hash for defining ActiveRecord enum: identifier => number
         def self.to_enum
-          enum_mapping.each_with_object({}) { |(k, v), hash| hash[k.identifier] = v }
+          enum_mapping.transform_keys { |k| k.identifier }
         end
 
         def self.pairing_rules