Add scope to list of symbols

Fixes #311

Author: natematykiewicz

lib/ruby_lsp/ruby_lsp_rails/document_symbol.rb

@@ -42,7 +42,7 @@ def on_call_node_enter(node)
 
         message = node.message
         case message
-        when *Support::Callbacks::ALL, "validate"
+        when *Support::Callbacks::ALL, "validate", "scope"
           handle_all_arg_types(node, T.must(message))
         when "validates", "validates!", "validates_each", "belongs_to", "has_one", "has_many",
           "has_and_belongs_to_many", "attr_readonly"

test/ruby_lsp_rails/document_symbol_test.rb

@@ -168,6 +168,20 @@ class FooModel < ApplicationRecord
         assert_equal("attr_readonly :foo", response[0].children[0].name)
       end
 
+      test "correctly handles scope" do
+        response = generate_document_symbols_for_source(<<~RUBY)
+          class FooModel < ApplicationRecord
+            scope :foo, ->{ where(a: 1).order(:b) }
+          end
+        RUBY
+
+        assert_equal(1, response.size)
+        assert_equal("FooModel", response[0].name)
+        assert_equal(2, response[0].children.size)
+        assert_equal("scope :foo", response[0].children[0].name)
+        assert_equal("scope <anonymous>", response[0].children[1].name)
+      end
+
       test "correctly handles model callbacks with multiple string arguments" do
         response = generate_document_symbols_for_source(<<~RUBY)
           class FooModel < ApplicationRecord