Check for local key literals in controllers

Author: jhawthorn

lib/rubocop/cop/github/rails_controller_render_literal.rb

@@ -54,7 +54,9 @@ class RailsControllerRenderLiteral < Cop
         def on_send(node)
           return unless render?(node)
 
-          if render_literal?(node) || render_view_component?(node) || render_const?(node)
+          return if render_view_component?(node) || render_const?(node)
+
+          if render_literal?(node)
           elsif option_pairs = render_with_options?(node)
             option_pairs = option_pairs.reject { |pair| options_key?(pair) }
 
@@ -65,18 +67,40 @@ def on_send(node)
             if template_node = option_pairs.map { |pair| template_key?(pair) }.compact.first
               if !literal?(template_node)
                 add_offense(node, location: :expression)
+                return
               end
             else
               add_offense(node, location: :expression)
+              return
             end
 
             if layout_node = option_pairs.map { |pair| layout_key?(pair) }.compact.first
               if !literal?(layout_node)
                 add_offense(node, location: :expression)
+                return
               end
             end
           else
             add_offense(node, location: :expression)
+            return
+          end
+
+          if render_literal?(node)
+            option_hash = node.arguments[1]
+            if option_hash && !option_hash.hash_type?
+              add_offense(node, location: :expression)
+              return
+            end
+            option_pairs = option_hash && option_hash.pairs
+          else
+            option_pairs = node.arguments[0].pairs
+          end
+
+          if option_pairs
+            locals = option_pairs.map { |pair| locals_key?(pair) }.compact.first
+            if locals && (!locals.hash_type? || !hash_with_literal_keys?(locals))
+              add_offense(node, location: :expression)
+            end
           end
         end
       end

lib/rubocop/cop/github/rails_view_render_literal.rb

@@ -17,12 +17,6 @@ class RailsViewRenderLiteral < Cop
           }) $_)
         PATTERN
 
-        def_node_matcher :locals_key?, <<-PATTERN
-          (pair (sym {
-            :locals
-          }) $_)
-        PATTERN
-
         def_node_matcher :partial_key?, <<-PATTERN
           (pair (sym {
             :file
@@ -32,10 +26,6 @@ class RailsViewRenderLiteral < Cop
           }) $_)
         PATTERN
 
-        def hash_with_literal_keys?(hash)
-          hash.pairs.all? { |pair| literal?(pair.key) }
-        end
-
         def on_send(node)
           return unless render?(node)
 

lib/rubocop/cop/github/render_literal_helpers.rb

@@ -36,6 +36,14 @@ module RenderLiteralHelpers
           (send nil? {:render :render_to_string} (send _ :with_collection ...) ...)
         PATTERN
 
+        def_node_matcher :locals_key?, <<-PATTERN
+          (pair (sym :locals) $_)
+        PATTERN
+
+        def hash_with_literal_keys?(hash)
+          hash.pairs.all? { |pair| literal?(pair.key) }
+        end
+
         def render_view_component?(node)
           render_view_component_instance?(node) ||
             render_view_component_collection?(node)

test/test_rails_controller_render_literal.rb

@@ -393,4 +393,65 @@ def index
     assert_equal 1, cop.offenses.count
     assert_equal "render must be used with a string literal or an instance of a Class", cop.offenses[0].message
   end
+
+  def test_render_shorthand_static_locals_no_offsense
+    investigate cop, <<-RUBY, "app/controllers/products_controller.rb"
+      class ProductsController < ActionController::Base
+        def index
+          render "products/index", locals: { product: product }
+        end
+      end
+    RUBY
+
+    assert_equal 0, cop.offenses.count
+  end
+
+  def test_render_partial_static_locals_no_offsense
+    investigate cop, <<-RUBY, "app/controllers/products_controller.rb"
+      class ProductsController < ActionController::Base
+        def index
+          render partial: "products/index", locals: { product: product }
+        end
+      end
+    RUBY
+
+    assert_equal 0, cop.offenses.count
+  end
+
+  def test_render_literal_dynamic_options_offense
+    investigate cop, <<-RUBY, "app/controllers/products_controller.rb"
+      class ProductsController < ActionController::Base
+        def index
+          render "products/product", options
+        end
+      end
+    RUBY
+
+    assert_equal 1, cop.offenses.count
+  end
+
+  def test_render_literal_dynamic_locals_offense
+    investigate cop, <<-RUBY, "app/controllers/products_controller.rb"
+      class ProductsController < ActionController::Base
+        def index
+          render "products/product", locals: locals
+        end
+      end
+    RUBY
+
+    assert_equal 1, cop.offenses.count
+  end
+
+
+  def test_render_literal_dynamic_local_key_offense
+    investigate cop, <<-RUBY, "app/controllers/products_controller.rb"
+      class ProductsController < ActionController::Base
+        def index
+          render "products/product", locals: { product_key => product }
+        end
+      end
+    RUBY
+
+    assert_equal 1, cop.offenses.count
+  end
 end