[Fix rubocop#1041] Fix a false positive for Rails/Output

Fixes rubocop#1041.

This PR fixes a false positive for `Rails/Output`
when output method is called with block argument.

The output method for the bad case is not designed to take a block argument.
Thus, by ignoring this, it can likely reduce false positives.

changelog/fix_a_false_positive_for_rails_output.md

@@ -0,0 +1 @@
+* [#1041](https://github.com/rubocop/rubocop-rails/issues/1041): Fix a false positive for `Rails/Output` when output method is called with block argument. ([@koic][])

lib/rubocop/cop/rails/output.rb

@@ -23,6 +23,7 @@ class Output < Base
 
         MSG = "Do not write to stdout. Use Rails's logger if you want to log."
         RESTRICT_ON_SEND = %i[ap p pp pretty_print print puts binwrite syswrite write write_nonblock].freeze
+        ALLOWED_TYPES = %i[send csend block numblock].freeze
 
         def_node_matcher :output?, <<~PATTERN
           (send nil? {:ap :p :pp :pretty_print :print :puts} ...)
@@ -39,8 +40,8 @@ class Output < Base
         PATTERN
 
         def on_send(node)
-          return if node.parent&.call_type?
-          return unless output?(node) || io_output?(node)
+          return if ALLOWED_TYPES.include?(node.parent&.type)
+          return if !output?(node) && !io_output?(node)
 
           range = offense_range(node)
 

spec/rubocop/cop/rails/output_spec.rb

@@ -140,6 +140,27 @@
     RUBY
   end
 
+  it 'does not register an offense when the `p` method is called with block argument' do
+    expect_no_offenses(<<~RUBY)
+      # phlex-rails gem.
+      div do
+        p { 'Some text' }
+      end
+    RUBY
+  end
+
+  it 'does not register an offense when io method is called with block argument' do
+    expect_no_offenses(<<~RUBY)
+      obj.write { do_somethig }
+    RUBY
+  end
+
+  it 'does not register an offense when io method is called with numbered block argument' do
+    expect_no_offenses(<<~RUBY)
+      obj.write { do_something(_1) }
+    RUBY
+  end
+
   it 'does not register an offense when a method is ' \
      'safe navigation called to a local variable with the same name as a print method' do
     expect_no_offenses(<<~RUBY)