Account for dynamic constant paths in document symbol (#437)

Author: vinistock

lib/ruby_lsp/ruby_lsp_rails/document_symbol.rb

@@ -151,7 +151,8 @@ def handle_all_arg_types(node, message)
               selection_range: range_from_location(argument.location),
             )
           when Prism::ConstantReadNode, Prism::ConstantPathNode
-            name = argument.full_name
+            name = constant_name(argument)
+            next unless name
             next if name.empty?
 
             append_document_symbol(

test/ruby_lsp_rails/document_symbol_test.rb

@@ -415,6 +415,18 @@ class FooModel < ApplicationRecord
         assert_equal("belongs_to :baz", response[0].children[1].name)
       end
 
+      test "does not break with incomplete constant path nodes" do
+        response = generate_document_symbols_for_source(<<~RUBY)
+          class FooModel < ApplicationRecord
+            validate var::Foo
+          end
+        RUBY
+
+        assert_equal(1, response.size)
+        assert_equal("FooModel", response[0].name)
+        assert_empty(response[0].children)
+      end
+
       private
 
       def generate_document_symbols_for_source(source)