Add attr_readonly to list of Symbols (#332)

Thanks @natematykiewicz !

Author: natematykiewicz

lib/ruby_lsp/ruby_lsp_rails/document_symbol.rb

@@ -44,7 +44,8 @@ def on_call_node_enter(node)
         case message
         when *Support::Callbacks::ALL, "validate"
           handle_all_arg_types(node, T.must(message))
-        when "validates", "validates!", "validates_each", "belongs_to", "has_one", "has_many", "has_and_belongs_to_many"
+        when "validates", "validates!", "validates_each", "belongs_to", "has_one", "has_many",
+          "has_and_belongs_to_many", "attr_readonly"
           handle_symbol_and_string_arg_types(node, T.must(message))
         when "validates_with"
           handle_class_arg_types(node, T.must(message))

test/ruby_lsp_rails/document_symbol_test.rb

@@ -155,6 +155,19 @@ class NestedTest < ActiveSupport::TestCase
         assert_equal("back to the same level", response[0].children[2].name)
       end
 
+      test "correctly handles attr_readonly" do
+        response = generate_document_symbols_for_source(<<~RUBY)
+          class FooModel < ApplicationRecord
+            attr_readonly :foo
+          end
+        RUBY
+
+        assert_equal(1, response.size)
+        assert_equal("FooModel", response[0].name)
+        assert_equal(1, response[0].children.size)
+        assert_equal("attr_readonly :foo", response[0].children[0].name)
+      end
+
       test "correctly handles model callbacks with multiple string arguments" do
         response = generate_document_symbols_for_source(<<~RUBY)
           class FooModel < ApplicationRecord