Improve naming and optimize methods of the build class

app/models/ci/build.rb

@@ -289,8 +289,10 @@ module Ci
     # Variables that do not depend on the environment name.
     #
     def simple_variables
+      strong_memoize(:simple_variables) do
         scoped_variables(environment: nil).to_runner_variables
       end
+    end
 
     ##
     # All variables, including persisted environment variables.
@@ -303,7 +305,11 @@ module Ci
         .to_runner_variables
     end
 
-    def variables_hash
+    ##
+    # Regular Ruby hash of scoped variables, without duplicates that are
+    # possible to be present in an array of hashes returned from `variables`.
+    #
+    def scoped_variables_hash
       scoped_variables.to_hash
     end
 

spec/models/ci/build_spec.rb

@@ -2070,7 +2070,7 @@ describe Ci::Build do
     end
   end
 
-  describe '#variables_hash' do
+  describe '#scoped_variables_hash' do
     context 'when overriding secret variables' do
       before do
         project.variables.create!(key: 'MY_VAR', value: 'my value 1')
@@ -2078,8 +2078,8 @@ describe Ci::Build do
       end
 
       it 'returns a regular hash created using valid ordering' do
-        expect(build.variables_hash).to include('MY_VAR': 'my value 2')
-        expect(build.variables_hash).not_to include('MY_VAR': 'my value 1')
+        expect(build.scoped_variables_hash).to include('MY_VAR': 'my value 2')
+        expect(build.scoped_variables_hash).not_to include('MY_VAR': 'my value 1')
       end
     end
 
@@ -2090,8 +2090,8 @@ describe Ci::Build do
       end
 
       it 'returns a hash including variable with higher precedence' do
-        expect(build.variables_hash).to include('MY_VAR': 'pipeline value')
-        expect(build.variables_hash).not_to include('MY_VAR': 'myvar')
+        expect(build.scoped_variables_hash).to include('MY_VAR': 'pipeline value')
+        expect(build.scoped_variables_hash).not_to include('MY_VAR': 'myvar')
       end
     end
   end