updates_for :only option

Gemfile.lock

@@ -86,7 +86,7 @@ GEM
       faraday
     async-io (1.32.2)
       async
-    async-pool (0.3.8)
+    async-pool (0.3.9)
       async (>= 1.25)
     builder (3.2.4)
     coderay (1.1.3)
@@ -95,7 +95,7 @@ GEM
       fiber-local
     crass (1.0.6)
     erubi (1.10.0)
-    faraday (1.7.0)
+    faraday (1.8.0)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
@@ -128,7 +128,7 @@ GEM
       rake (>= 10.0)
     globalid (0.5.2)
       activesupport (>= 5.0)
-    i18n (1.8.10)
+    i18n (1.8.11)
       concurrent-ruby (~> 1.0)
     loofah (2.12.0)
       crass (~> 1.0.2)
@@ -137,35 +137,35 @@ GEM
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     marcel (1.0.2)
-    method_source (0.9.2)
+    method_source (1.0.0)
     mini_mime (1.1.2)
     minitest (5.14.4)
     mocha (1.13.0)
     multi_json (1.15.0)
     multipart-post (2.1.1)
     nio4r (2.5.8)
-    nokogiri (1.12.5-arm64-darwin)
+    nokogiri (1.12.5-x86_64-linux)
       racc (~> 1.4)
     octokit (4.21.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.20.1)
+    parallel (1.21.0)
     parser (3.0.2.0)
       ast (~> 2.4.1)
     protocol-hpack (1.4.2)
     protocol-http (0.22.5)
-    protocol-http1 (0.14.1)
+    protocol-http1 (0.14.2)
       protocol-http (~> 0.22)
     protocol-http2 (0.14.2)
       protocol-hpack (~> 1.4)
       protocol-http (~> 0.18)
-    pry (0.12.2)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
-    pry-nav (0.3.0)
-      pry (>= 0.9.10, < 0.13.0)
+    pry (0.14.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    pry-nav (1.0.0)
+      pry (>= 0.9.10, < 0.15)
     public_suffix (4.0.6)
-    racc (1.5.2)
+    racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -199,18 +199,18 @@ GEM
     rake (13.0.6)
     regexp_parser (2.1.1)
     rexml (3.2.5)
-    rubocop (1.18.4)
+    rubocop (1.22.3)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.8.0, < 2.0)
+      rubocop-ast (>= 1.12.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.10.0)
+    rubocop-ast (1.13.0)
       parser (>= 3.0.1.1)
-    rubocop-performance (1.11.4)
+    rubocop-performance (1.11.5)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
     ruby-progressbar (1.11.0)
@@ -221,29 +221,29 @@ GEM
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.2)
-      actionpack (>= 4.0)
-      activesupport (>= 4.0)
+    sprockets-rails (3.3.0)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     sqlite3 (1.4.2)
-    standard (1.1.7)
-      rubocop (= 1.18.4)
-      rubocop-performance (= 1.11.4)
+    standard (1.4.0)
+      rubocop (= 1.22.3)
+      rubocop-performance (= 1.11.5)
     standardrb (1.0.0)
       standard
     thor (1.1.0)
     thread-local (1.1.0)
     timers (4.3.3)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.0.0)
+    unicode-display_width (2.1.0)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.4.2)
+    zeitwerk (2.5.1)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
   cable_ready!
@@ -257,4 +257,4 @@ DEPENDENCIES
   standardrb
 
 BUNDLED WITH
-   2.2.19
+   2.2.27

app/helpers/cable_ready_helper.rb

@@ -8,10 +8,11 @@ def stream_from(*keys, html_options: {})
     tag.stream_from(**build_options(*keys, html_options))
   end
 
-  def updates_for(*keys, url: nil, debounce: nil, html_options: {}, &block)
+  def updates_for(*keys, url: nil, debounce: nil, only: nil, html_options: {}, &block)
     options = build_options(*keys, html_options)
     options[:url] = url if url
     options[:debounce] = debounce if debounce
+    options[:only] = only if only
     tag.updates_for(**options) { capture(&block) }
   end
 

app/models/concerns/cable_ready/updatable.rb

@@ -43,9 +43,9 @@ def cable_ready_collections
         @cable_ready_collections ||= CollectionsRegistry.new
       end
 
-      def cable_ready_update_collection(resource, name)
+      def cable_ready_update_collection(resource, name, model)
         identifier = resource.to_global_id.to_s + ":" + name.to_s
-        ActionCable.server.broadcast(identifier, {})
+        ActionCable.server.broadcast(identifier, model.respond_to?(:previous_changes) ? {changed: model.previous_changes.keys} : {})
       end
 
       def enrich_association_with_updates(name, option)

app/models/concerns/cable_ready/updatable/collections_registry.rb

@@ -15,7 +15,7 @@ def broadcast_for!(model, operation)
           resource = find_resource_for_update(collection, model)
           next if resource.nil?
 
-          collection[:klass].cable_ready_update_collection(resource, collection[:name]) if collection[:options][:if].call(resource)
+          collection[:klass].cable_ready_update_collection(resource, collection[:name], model) if collection[:options][:if].call(resource)
         end
       end
 

app/models/concerns/cable_ready/updatable/model_updatable_callbacks.rb

@@ -21,7 +21,7 @@ def broadcast_create(model)
 
       def broadcast_update(model)
         ActionCable.server.broadcast(model.class, {})
-        ActionCable.server.broadcast(model.to_global_id, {})
+        ActionCable.server.broadcast(model.to_global_id, model.respond_to?(:previous_changes) ? {changed: model.previous_changes.keys} : {})
       end
     end
   end

javascript/elements/updates_for_element.js

@@ -40,12 +40,15 @@ export default class UpdatesForElement extends SubscribingElement {
     }
   }
 
-  async update () {
+  async update (data) {
     const identifier = this.getAttribute('identifier')
     const query = `updates-for[identifier="${identifier}"]`
     const blocks = document.querySelectorAll(query)
     if (blocks[0] !== this) return
 
+    const only = this.getAttribute('only')
+    if (only && data.changed && !data.changed.includes(only)) return
+
     const html = {}
     const template = document.createElement('template')
 

test/lib/cable_ready/updatable_test.rb

@@ -13,7 +13,7 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
   test "updates the collection when an item is added" do
     mock_server = mock("server")
     mock_server.expects(:broadcast).with(User, {}).once
-    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {}).once
+    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {changed: ["id", "title", "user_id", "created_at", "updated_at"]}).once
 
     ActionCable.stubs(:server).returns(mock_server)
     user = User.create(name: "John Doe")
@@ -26,7 +26,7 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
     post = user.posts.create(title: "Lorem")
 
     mock_server = mock("server")
-    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {}).once
+    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {changed: ["id", "title", "user_id", "created_at", "updated_at"]}).once
 
     ActionCable.stubs(:server).returns(mock_server)
 
@@ -38,7 +38,7 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
     post = user.posts.create(title: "Lorem")
 
     mock_server = mock("server")
-    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {}).once
+    mock_server.expects(:broadcast).with("gid://dummy/User/1:posts", {changed: ["title", "updated_at"]}).once
 
     ActionCable.stubs(:server).returns(mock_server)
 
@@ -50,7 +50,7 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
 
     mock_server = mock("server")
     mock_server.expects(:broadcast).with(User, {}).once
-    mock_server.expects(:broadcast).with(user.to_global_id, {}).once
+    mock_server.expects(:broadcast).with(user.to_global_id, {changed: ["name", "updated_at"]}).once
 
     ActionCable.stubs(:server).returns(mock_server)
 
@@ -63,10 +63,10 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
 
     mock_server = mock("server")
     mock_server.expects(:broadcast).with(User, {}).once
-    mock_server.expects(:broadcast).with(user.to_global_id, {}).once
+    mock_server.expects(:broadcast).with(user.to_global_id, {changed: ["name", "updated_at"]}).once
     mock_server.expects(:broadcast).with("gid://dummy/Team/1:users", {}).once
     mock_server.expects(:broadcast).with(Team, {}).once
-    mock_server.expects(:broadcast).with(team.to_global_id, {}).once
+    mock_server.expects(:broadcast).with(team.to_global_id, {changed: ["name", "updated_at"]}).once
 
     ActionCable.stubs(:server).returns(mock_server)
 
@@ -94,7 +94,7 @@ class CableReady::UpdatableTest < ActiveSupport::TestCase
     section.updates_enabled = true
 
     mock_server.expects(:broadcast).with(Section, {}).once
-    mock_server.expects(:broadcast).with(section.to_global_id, {}).once
+    mock_server.expects(:broadcast).with(section.to_global_id, {changed: ["title", "updated_at", "updates_enabled"]}).once
     section.update(title: "First Section")
   end