Enhance schema hover link to jump to the right table

lib/ruby_lsp/ruby_lsp_rails/addon.rb

@@ -4,6 +4,7 @@
 require "ruby_lsp/addon"
 
 require_relative "rails_client"
+require_relative "schema_collector"
 require_relative "hover"
 require_relative "code_lens"
 
@@ -17,9 +18,15 @@ def client
         @client ||= T.let(RailsClient.new, T.nilable(RailsClient))
       end
 
+      sig { returns(SchemaCollector) }
+      def schema_collector
+        @schema_collector ||= T.let(SchemaCollector.new(client.root), T.nilable(SchemaCollector))
+      end
+
       sig { override.params(message_queue: Thread::Queue).void }
       def activate(message_queue)
         client.check_if_server_is_running!
+        schema_collector.parse_schema
       end
 
       sig { override.void }
@@ -44,7 +51,7 @@ def create_code_lens_listener(uri, dispatcher)
         ).returns(T.nilable(Listener[T.nilable(Interface::Hover)]))
       end
       def create_hover_listener(nesting, index, dispatcher)
-        Hover.new(client, nesting, index, dispatcher)
+        Hover.new(client, schema_collector, nesting, index, dispatcher)
       end
 
       sig { override.returns(String) }

lib/ruby_lsp/ruby_lsp_rails/hover.rb

@@ -28,16 +28,18 @@ class Hover < ::RubyLsp::Listener
       sig do
         params(
           client: RailsClient,
+          schema_collector: SchemaCollector,
           nesting: T::Array[String],
           index: RubyIndexer::Index,
           dispatcher: Prism::Dispatcher,
         ).void
       end
-      def initialize(client, nesting, index, dispatcher)
+      def initialize(client, schema_collector, nesting, index, dispatcher)
         super(dispatcher)
 
         @_response = T.let(nil, ResponseType)
         @client = client
+        @schema_collector = schema_collector
         @nesting = nesting
         @index = index
         dispatcher.register(self, :on_constant_path_node_enter, :on_constant_read_node_enter, :on_call_node_enter)
@@ -91,8 +93,17 @@ def generate_column_content(name)
         return if model.nil?
 
         schema_file = model[:schema_file]
+        if schema_file
+          location = @schema_collector.tables[model[:schema_table]]
+          fragment = "L#{location.start_line - 1},#{location.start_column}-"\
+            "#{location.end_line - 1},#{location.end_column}" if location
+          schema_uri = URI::Generic.from_path(
+            path: schema_file,
+            fragment: fragment,
+          )
+        end
         content = +""
-        content << "[Schema](#{URI::Generic.build(scheme: "file", path: schema_file)})\n\n" if schema_file
+        content << "[Schema](#{schema_uri})\n\n" if schema_uri
         content << model[:columns].map { |name, type| "**#{name}**: #{type}\n" }.join("\n")
         content
       end

lib/ruby_lsp/ruby_lsp_rails/schema_collector.rb

@@ -0,0 +1,40 @@
+# typed: strict
+# frozen_string_literal: true
+
+module RubyLsp
+  module Rails
+    class SchemaCollector < Prism::Visitor
+      extend T::Sig
+
+      sig { returns(T::Hash[String, Prism::Location]) }
+      attr_reader :tables
+
+      sig { params(project_root: Pathname).void }
+      def initialize(project_root)
+        super()
+
+        @tables = T.let({}, T::Hash[String, Prism::Location])
+        @schema_path = T.let(project_root.join("db", "schema.rb").to_s, String)
+      end
+
+      sig { void }
+      def parse_schema
+        parse_result = Prism.parse_file(@schema_path)
+        parse_result.value.accept(self)
+      end
+
+      sig { params(node: Prism::CallNode).void }
+      def visit_call_node(node)
+        if node.message == "create_table"
+          first_argument = node.arguments&.arguments&.first
+
+          if first_argument&.is_a?(Prism::StringNode)
+            @tables[first_argument.content] = node.location
+          end
+        end
+
+        super
+      end
+    end
+  end
+end

lib/ruby_lsp_rails/rack_app.rb

@@ -41,6 +41,7 @@ def resolve_database_info_from_model(model_name)
           body = JSON.dump({
             columns: const.columns.map { |column| [column.name, column.type] },
             schema_file: schema_file,
+            schema_table: const.table_name,
           })
 
           [200, { "Content-Type" => "application/json" }, [body]]

test/ruby_lsp_rails/rack_app_test.rb

@@ -20,6 +20,7 @@ class RackAppTest < ActionDispatch::IntegrationTest
               ["created_at", "datetime"],
               ["updated_at", "datetime"],
             ],
+            "schema_table" => "users",
           },
           JSON.parse(response.body),
         )

test/ruby_lsp_rails/schema_collector_test.rb

@@ -0,0 +1,27 @@
+# typed: true
+# frozen_string_literal: true
+
+require "test_helper"
+
+module RubyLsp
+  module Rails
+    class SchemaCollectorTest < ActiveSupport::TestCase
+      SCHEMA_FILE = <<~RUBY
+        ActiveRecord::Schema[7.1].define(version: 2023_12_09_114241) do
+          create_table "cats", force: :cascade do |t|
+          end
+
+          create_table "dogs", force: :cascade do |t|
+          end
+        end
+      RUBY
+
+      test "store locations of models by parsing create_table calls" do
+        collector = RubyLsp::Rails::SchemaCollector.new(Pathname.new("example_app"))
+        Prism.parse(SCHEMA_FILE).value.accept(collector)
+
+        assert_equal(["cats", "dogs"], collector.tables.keys)
+      end
+    end
+  end
+end