Support more complex argument patterns on Rails/Validation auto-correction

CHANGELOG.md

@@ -11,6 +11,7 @@
 * [#6254](https://github.com/rubocop-hq/rubocop/issues/6254): Fix `Layout/RescueEnsureAlignment` for non-local assignments. ([@marcotc][])
 * [#6648](https://github.com/rubocop-hq/rubocop/issues/6648): Fix auto-correction of `Style/EmptyLiteral` when `Hash.new` is passed as the first argument to `super`. ([@rrosenblum][])
 * [#6351](https://github.com/rubocop-hq/rubocop/pull/6351): Fix a false positive for `Layout/ClosingParenthesisIndentation` when first argument is multiline. ([@antonzaytsev][])
+* [#6689](https://github.com/rubocop-hq/rubocop/pull/6689): Support more complex argument patterns on `Rails/Validation` auto-correction. ([@r7kamura][])
 
 ## 0.63.1 (2019-01-22)
 

lib/rubocop/cop/rails/validation.rb

@@ -57,6 +57,9 @@ def on_send(node)
         end
 
         def autocorrect(node)
+          last_argument = node.arguments.last
+          return if !last_argument.literal? && !last_argument.splat_type?
+
           lambda do |corrector|
             corrector.replace(node.loc.selector, 'validates')
             correct_validate_type(corrector, node)
@@ -75,12 +78,14 @@ def preferred_method(method)
         end
 
         def correct_validate_type(corrector, node)
-          options = node.arguments.find { |arg| !arg.sym_type? }
+          last_argument = node.arguments.last
           validate_type = node.method_name.to_s.split('_')[1]
 
-          if options
-            corrector.replace(options.loc.expression,
-                              "#{validate_type}: #{braced_options(options)}")
+          if last_argument.hash_type?
+            corrector.replace(
+              last_argument.loc.expression,
+              "#{validate_type}: #{braced_options(last_argument)}"
+            )
           else
             corrector.insert_after(node.loc.expression,
                                    ", #{validate_type}: true")

spec/rubocop/cop/rails/validation_spec.rb

@@ -20,34 +20,130 @@
     end
   end
 
-  describe 'autocorrect' do
-    described_class::TYPES.each do |parameter|
-      it "corrects validates_#{parameter}_of" do
-        new_source = autocorrect_source(
-          "validates_#{parameter}_of :full_name, :birth_date"
-        )
-        expect(new_source).to eq(
-          "validates :full_name, :birth_date, #{parameter}: true"
-        )
-      end
-    end
-
-    it 'corrects validates_numericality_of with options' do
-      new_source = autocorrect_source(
-        'validates_numericality_of :age, minimum: 0, maximum: 122'
-      )
-      expect(new_source).to eq(
-        'validates :age, numericality: { minimum: 0, maximum: 122 }'
-      )
-    end
-
-    it 'autocorrect validates_numericality_of with options in braces' do
-      new_source = autocorrect_source(
-        'validates_numericality_of :age, { minimum: 0, maximum: 122 }'
-      )
-      expect(new_source).to eq(
-        'validates :age, numericality: { minimum: 0, maximum: 122 }'
-      )
+  describe '#autocorrect' do
+    shared_examples 'auto-corrects' do
+      it 'auto-corrects' do
+        expect(autocorrect_source(source)).to eq(auto_corrected_source)
+      end
+    end
+
+    shared_examples 'does not auto-correct' do
+      it 'does not auto-correct' do
+        expect(autocorrect_source(source)).to eq(source)
+      end
+    end
+
+    described_class::TYPES.each do |type|
+      context "with validates_#{type}_of" do
+        let(:auto_corrected_source) do
+          "validates :full_name, :birth_date, #{type}: true"
+        end
+
+        let(:source) do
+          "validates_#{type}_of :full_name, :birth_date"
+        end
+
+        include_examples 'auto-corrects'
+      end
+    end
+
+    context 'with single attribute name' do
+      let(:auto_corrected_source) do
+        'validates :a, numericality: true'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with multi attribute names' do
+      let(:auto_corrected_source) do
+        'validates :a, :b, numericality: true'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a, :b'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with non-braced hash literal' do
+      let(:auto_corrected_source) do
+        'validates :a, :b, numericality: { minimum: 1 }'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a, :b, minimum: 1'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with braced hash literal' do
+      let(:auto_corrected_source) do
+        'validates :a, :b, numericality: { minimum: 1 }'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a, :b, { minimum: 1 }'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with splat' do
+      let(:auto_corrected_source) do
+        'validates :a, *b, numericality: true'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a, *b'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with splat and options' do
+      let(:auto_corrected_source) do
+        'validates :a, *b, :c, numericality: { minimum: 1 }'
+      end
+
+      let(:source) do
+        'validates_numericality_of :a, *b, :c, minimum: 1'
+      end
+
+      include_examples 'auto-corrects'
+    end
+
+    context 'with trailing send node' do
+      let(:source) do
+        'validates_numericality_of :a, b'
+      end
+
+      include_examples 'does not auto-correct'
+    end
+
+    context 'with trailing constant' do
+      let(:source) do
+        'validates_numericality_of :a, B'
+      end
+
+      include_examples 'does not auto-correct'
+    end
+
+    context 'with trailing local variable' do
+      let(:source) do
+        <<-RUBY.strip_indent
+          b = { minimum: 1 }
+          validates_numericality_of :a, b
+        RUBY
+      end
+
+      include_examples 'does not auto-correct'
     end
   end
 end