Implement basic schema goto definitions

lib/ruby_lsp/ruby_lsp_rails/addon.rb

@@ -8,6 +8,7 @@
 require_relative "support/associations"
 require_relative "support/callbacks"
 require_relative "support/validations"
+require_relative "support/routes"
 require_relative "support/location_builder"
 require_relative "runner_client"
 require_relative "hover"
@@ -129,7 +130,7 @@ def create_document_symbol_listener(response_builder, dispatcher)
       def create_definition_listener(response_builder, uri, node_context, dispatcher)
         return unless @global_state
 
-        Definition.new(@rails_runner_client, response_builder, node_context, @global_state.index, dispatcher)
+        Definition.new(@rails_runner_client, response_builder, node_context, @global_state.index, uri, dispatcher)
       end
 
       # @override

lib/ruby_lsp/ruby_lsp_rails/definition.rb

@@ -31,12 +31,13 @@ class Definition
       include Requests::Support::Common
 
       #: (RunnerClient client, RubyLsp::ResponseBuilders::CollectionResponseBuilder[(Interface::Location | Interface::LocationLink)] response_builder, NodeContext node_context, RubyIndexer::Index index, Prism::Dispatcher dispatcher) -> void
-      def initialize(client, response_builder, node_context, index, dispatcher)
+      def initialize(client, response_builder, node_context, index, uri, dispatcher)
         @client = client
         @response_builder = response_builder
         @node_context = node_context
         @nesting = node_context.nesting #: Array[String]
         @index = index
+        @uri = uri
 
         dispatcher.register(self, :on_call_node_enter, :on_symbol_node_enter, :on_string_node_enter)
       end
@@ -87,6 +88,8 @@ def handle_possible_dsl(node)
         elsif Support::Validations::ALL.include?(message)
           handle_validation(node, call_node, arguments)
           handle_if_unless_conditional(node, call_node, arguments)
+        elsif Support::Routes::ALL.include?(message)
+          handle_controller_action(node)
         end
       end
 
@@ -125,6 +128,28 @@ def handle_validation(node, call_node, arguments)
         collect_definitions(name)
       end
 
+      #: ((Prism::SymbolNode | Prism::StringNode) node) -> void
+      def handle_controller_action(node)
+        return unless @uri.path.match?(Support::Routes::ROUTE_FILES_PATTERN)
+        return unless node.is_a?(Prism::StringNode)
+
+        content = node.content
+        return unless content.include?("#")
+
+        controller, action = content.split("#", 2)
+
+        results = @client.controller_action_target(
+          controller: controller,
+          action: action,
+        )
+
+        return unless results&.any?
+
+        results.each do |result|
+          @response_builder << Support::LocationBuilder.line_location_from_s(result.fetch(:location))
+        end
+      end
+
       #: (Prism::CallNode node) -> void
       def handle_association(node)
         first_argument = node.arguments&.arguments&.first

lib/ruby_lsp/ruby_lsp_rails/runner_client.rb

@@ -159,6 +159,20 @@ def association_target(model_name:, association_name:)
         nil
       end
 
+      def controller_action_target(controller:, action:)
+        make_request(
+          "controller_action_target",
+          controller: controller,
+          action: action,
+          )
+      rescue MessageError
+        log_message(
+          "Ruby LSP Rails failed to get controller action location",
+          type: RubyLsp::Constant::MessageType::ERROR,
+          )
+        nil
+    end
+
       #: (String name) -> Hash[Symbol, untyped]?
       def route_location(name)
         make_request("route_location", name: name)

lib/ruby_lsp/ruby_lsp_rails/server.rb

@@ -311,6 +311,10 @@ def execute(request, params)
           with_request_error_handling(request) do
             send_result(resolve_association_target(params))
           end
+        when "controller_action_target"
+          with_request_error_handling(request) do
+            send_result(resolve_controller_action_target(params))
+          end
         when "pending_migrations_message"
           with_request_error_handling(request) do
             send_result({ pending_migrations_message: pending_migrations_message })
@@ -437,6 +441,35 @@ def resolve_association_target(params)
         nil
       end
 
+      #: (Hash[Symbol | String, untyped]) -> Array[Hash[Symbol | String, untyped]]
+      def resolve_controller_action_target(params)
+        controller, action = params.values_at(:controller, :action)
+        return unless controller && action
+
+        results = []
+
+        ::Rails.application.routes.routes.each do |route|
+          reqs = route.requirements
+          next unless reqs[:controller]&.ends_with?(controller) && reqs[:action] == action
+
+          controller_class = "#{reqs[:controller].camelize}Controller".safe_constantize # rubocop:disable Sorbet/ConstantsFromStrings
+          next unless controller_class
+
+          method = controller_class.instance_method(reqs[:action])
+          file, line = method.source_location
+          next unless file && line
+
+          results << {
+            location: "#{file}:#{line}",
+            name: "#{controller_class.name}##{reqs[:action]}",
+          }
+        rescue NameError
+          next
+        end
+
+        results
+      end
+
       #: (Module?) -> bool
       def active_record_model?(const)
         !!(

lib/ruby_lsp/ruby_lsp_rails/support/routes.rb

@@ -0,0 +1,21 @@
+# typed: strict
+# frozen_string_literal: true
+
+module RubyLsp
+  module Rails
+    module Support
+      module Routes
+        ALL = [
+          "get",
+          "post",
+          "put",
+          "patch",
+          "delete",
+          "match",
+        ].freeze
+
+        ROUTE_FILES_PATTERN = %r{(^|/)config/routes(?:/[^/]+)?\.rb$}
+      end
+    end
+  end
+end

test/dummy/app/controllers/admin/users_controller.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Admin
+  class UsersController < ApplicationController
+    def index; end
+
+    def archive; end
+  end
+end

test/dummy/app/controllers/users_controller.rb

@@ -4,4 +4,6 @@ class UsersController < ApplicationController
   def index; end
 
   def archive; end
+
+  def unarchive; end
 end

test/dummy/config/routes.rb

@@ -3,7 +3,14 @@
 Rails.application.routes.draw do
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
   resources :users do
-    get :archive, on: :collection
+    get :archive, on: :collection, to: "users#archive"
+    get :unarchive, on: :collection, to: "users#unarchive"
+  end
+
+  scope module: "admin" do
+    resources :users do
+      get :archive, on: :collection, to: "users#archive"
+    end
   end
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.

test/ruby_lsp_rails/definition_test.rb

@@ -467,10 +467,75 @@ def name; end
         assert_equal(15, response.range.end.character)
       end
 
+      test "finds the controller action definition when only one controller matches" do
+        source = <<~RUBY
+          Rails.application.routes.draw do
+            # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
+            resources :users do
+              get :archive, on: :collection, to: "users#archive"
+              get :unarchive, on: :collection, to: "users#unarchive"
+            end
+
+            scope module: "admin" do
+              resources :users do
+                get :archive, on: :collection, to: "users#archive"
+              end
+            end
+          end
+        RUBY
+
+        response = generate_definitions_for_source(source, { line: 4, character: 45 }, uri: URI("file:///config/routes.rb"))
+
+        assert_equal(1, response.size)
+
+        location = response.first
+
+        expected_path = File.expand_path("test/dummy/app/controllers/users_controller.rb")
+        assert_equal("file://#{expected_path}", location.uri)
+        assert_equal(7, location.range.start.line)
+        assert_equal(7, location.range.end.line)
+      end
+
+      test "finds all matching controller actions when multiple controllers exist in different namespaces" do
+        source = <<~RUBY
+          Rails.application.routes.draw do
+            # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
+            resources :users do
+              get :archive, on: :collection, to: "users#archive"
+              get :unarchive, on: :collection, to: "users#unarchive"
+            end
+
+            scope module: "admin" do
+              resources :users do
+                get :archive, on: :collection, to: "users#archive"
+              end
+            end
+          end
+        RUBY
+
+        response = generate_definitions_for_source(source, { line: 3, character: 45 }, uri: URI("file:///config/routes.rb"))
+
+        assert_equal(2, response.size)
+
+        location = response.first
+
+        expected_path = File.expand_path("test/dummy/app/controllers/users_controller.rb")
+        assert_equal("file://#{expected_path}", location.uri)
+        assert_equal(5, location.range.start.line)
+        assert_equal(5, location.range.end.line)
+
+        location = response.second
+
+        expected_path = File.expand_path("test/dummy/app/controllers/admin/users_controller.rb")
+        assert_equal("file://#{expected_path}", location.uri)
+        assert_equal(6, location.range.start.line)
+        assert_equal(6, location.range.end.line)
+      end
+
       private
 
-      def generate_definitions_for_source(source, position)
-        with_server(source) do |server, uri|
+      def generate_definitions_for_source(source, position, uri: nil)
+        with_server(source, *[uri].compact) do |server, uri|
           sleep(0.1) while RubyLsp::Addon.addons.first.instance_variable_get(:@rails_runner_client).is_a?(NullClient)
 
           server.process_message(