Move parallelization to Ci::Config::Normalizer

lib/gitlab/ci/config/entry/jobs.rb

@@ -29,15 +29,7 @@ module Gitlab
           # rubocop: disable CodeReuse/ActiveRecord
           def compose!(deps = nil)
             super do
-              @config = @config.map do |name, config|
-                total = config[:parallel]
-                if total
-                  Array.new(total) { { name => config } }
-                    .each_with_index { |build, idx| build["#{name} #{idx + 1}/#{total}".to_sym] = build.delete(name) }
-                else
-                  { name => config }
-                end
-              end.flatten.reduce(:merge)
+              @config = Ci::Config::Normalizer.normalize_jobs(@config)
 
               @config.each do |name, config|
                 node = hidden?(name) ? Entry::Hidden : Entry::Job

lib/gitlab/ci/config/normalizer.rb

+module Gitlab
+  module Ci
+    class Config
+      class Normalizer
+        class << self
+          def normalize_jobs(jobs_config)
+            parallelized_jobs = {}
+
+            parallelized_config = jobs_config.map do |name, config|
+              if config&.[](:parallel)
+                total = config[:parallel]
+                names = parallelize_job_names(name, total)
+                parallelized_jobs[name] = names
+                Hash[names.collect { |job_name| [job_name.to_sym, config] }]
+              else
+                { name => config }
+              end
+            end.reduce(:merge)
+
+            parallelized_config.each do |name, config|
+              next unless config[:dependencies]
+
+              deps = config[:dependencies].map do |dep|
+                if parallelized_jobs.keys.include?(dep.to_sym)
+                  config[:dependencies].delete(dep)
+                  parallelized_jobs[dep.to_sym]
+                else
+                  dep
+                end
+              end.flatten
+
+              config[:dependencies] = deps
+            end
+          end
+
+          private
+
+          def parallelize_job_names(name, total)
+            jobs = []
+
+            total.times do |idx|
+              jobs << "#{name} #{idx + 1}/#{total}"
+            end
+
+            jobs
+          end
+        end
+      end
+    end
+  end
+end