first attempt

app/helpers/react_on_rails_helper.rb

@@ -129,6 +129,10 @@ def react_component_hash(component_name, raw_options = {})
     server_rendered_html = internal_result["result"]["html"]
     console_script = internal_result["result"]["consoleReplayScript"]
 
+    if server_rendered_html.is_a?(String) && internal_result["result"]["hasErrors"]
+      server_rendered_html = { COMPONENT_HTML_KEY => internal_result["result"]["html"] }
+    end
+
     if server_rendered_html.is_a?(Hash)
       build_react_component_result_for_server_rendered_hash(
         server_rendered_html: server_rendered_html,

package.json

@@ -88,7 +88,7 @@
   },
   "homepage": "https://github.com/shakacode/react_on_rails#readme",
   "dependencies": {
-    "react-on-rails": "^9.0.3",
+    "react-on-rails": "^10.0.0",
     "react-redux": "^5.0.6"
   }
 }

react_on_rails.gemspec

@@ -25,26 +25,26 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = ">= 2.0.0"
 
-  s.add_dependency "rainbow", "~> 2.2"
+  s.add_dependency "addressable"
   s.add_dependency "connection_pool"
   s.add_dependency "execjs", "~> 2.5"
   s.add_dependency "rails", ">= 3.2"
-  s.add_dependency "addressable"
+  s.add_dependency "rainbow", "~> 2.2"
 
-  s.add_development_dependency "rails", "~> 5.1.2"
+  s.add_development_dependency "awesome_print"
   s.add_development_dependency "bundler", "~> 1.10"
-  s.add_development_dependency "rake", "~> 10.0"
-  s.add_development_dependency "listen"
-  s.add_development_dependency "rspec"
   s.add_development_dependency "coveralls"
+  s.add_development_dependency "gem-release"
   s.add_development_dependency "generator_spec"
+  s.add_development_dependency "listen"
   s.add_development_dependency "pry"
   s.add_development_dependency "pry-byebug"
-  s.add_development_dependency "pry-stack_explorer"
   s.add_development_dependency "pry-doc"
+  s.add_development_dependency "pry-rescue"
+  s.add_development_dependency "pry-stack_explorer"
   s.add_development_dependency "pry-state"
   s.add_development_dependency "pry-toys"
-  s.add_development_dependency "pry-rescue"
-  s.add_development_dependency "awesome_print"
-  s.add_development_dependency "gem-release"
+  s.add_development_dependency "rails", "~> 5.1.2"
+  s.add_development_dependency "rake", "~> 10.0"
+  s.add_development_dependency "rspec"
 end

spec/dummy/app/views/pages/broken_app.html.erb

@@ -0,0 +1,10 @@
+<% p flash %>
+<%= flash["error"] %>
+
+<%= render "header" %>
+
+<%= react_component_hash("BrokenApp", prerender: true)['componentHtml'] %>
+
+<hr/>
+
+This page demonstrates a component that suffers a prerendering error but still returns a hash.

spec/dummy/client/app/startup/BrokenApp.jsx

@@ -0,0 +1,7 @@
+// Top level component for simple client side only rendering
+import React from 'react';
+
+/*
+ *  Just an example of what can go wrong while coding. No import. Whoops!
+ */
+export default props => <HelloWorld {...props} />;

spec/dummy/client/app/startup/clientRegistration.jsx

@@ -7,6 +7,7 @@ import HelloWorld from '../components/HelloWorld';
 import HelloWorldWithLogAndThrow from '../components/HelloWorldWithLogAndThrow';
 import HelloWorldES5 from '../components/HelloWorldES5';
 import HelloWorldApp from './HelloWorldApp';
+import BrokenApp from './BrokenApp';
 
 import ReduxApp from './ClientReduxApp';
 import ReduxSharedStoreApp from './ClientReduxSharedStoreApp';
@@ -33,6 +34,7 @@ ReactOnRails.setOptions({
 });
 
 ReactOnRails.register({
+  BrokenApp,
   HelloWorld,
   HelloWorldWithLogAndThrow,
   HelloWorldES5,

spec/dummy/client/app/startup/serverRegistration.jsx

@@ -14,6 +14,7 @@ import HelloWorldWithLogAndThrow from '../components/HelloWorldWithLogAndThrow';
 
 // Generator function
 import HelloWorldApp from './HelloWorldApp';
+import BrokenApp from './BrokenApp';
 
 // Example of React + Redux
 import ReduxApp from './ServerReduxApp';
@@ -42,6 +43,7 @@ import ReactHelmetApp from './ReactHelmetServerApp';
 import ImageExample from '../components/ImageExample';
 
 ReactOnRails.register({
+  BrokenApp,
   HelloWorld,
   HelloWorldWithLogAndThrow,
   HelloWorldES5,

spec/dummy/config/routes.rb

@@ -32,5 +32,6 @@
   get "turbolinks_cache_disabled" => "pages#turbolinks_cache_disabled"
   get "rendered_html" => "pages#rendered_html"
   get "react_helmet" => "pages#react_helmet"
+  get "broken_app" => "pages#broken_app"
   get "image_example" => "pages#image_example"
 end

spec/dummy/package.json

@@ -7,12 +7,12 @@
     "test": "yarn run build:test && yarn run lint && rspec",
     "lint": "cd client && yarn run lint",
     "build:clean": "rm -rf public/webpack || true",
-    "build:production:client": "(cd client && yarn run build:production:client --silent)",
-    "build:production:server": "(cd client && yarn run build:production:server --silent)",
-    "build:client": "(cd client && yarn run build:client --silent",
-    "build:server": "(cd client && yarn run build:server --silent)",
-    "build:dev:client": "(cd client && yarn run build:dev:client --silent)",
-    "build:dev:server": "(cd client && yarn run build:dev:server --silent)",
+    "build:production:client": "(cd client && yarn run --silent build:production:client)",
+    "build:production:server": "(cd client && yarn run --silent build:production:server)",
+    "build:client": "(cd client && yarn run --silent build:client",
+    "build:server": "(cd client && yarn run --silent build:server)",
+    "build:dev:client": "(cd client && yarn run --silent build:dev:client)",
+    "build:dev:server": "(cd client && yarn run --silent build:dev:server)",
     "hot-assets": "(cd client && yarn run hot-assets)"
   },
   "repository": {

spec/dummy/spec/features/integration_spec.rb

@@ -188,6 +188,19 @@ def change_text_expect_dom_selector(dom_selector)
   end
 end
 
+feature "returns hash if hash_result == true even with prerendering error", :js do
+  subject { page }
+  background do
+    begin
+      visit "/broken_app"
+    rescue Capybara::Poltergeist::JavascriptError # rubocop:disable Lint/HandleExceptions
+    end
+  end
+  scenario "react_component should return hash" do
+    expect(subject.html).to include("Exception in rendering!")
+  end
+end
+
 feature "generator function returns renderedHtml as an object with additional HTML markups" do
   shared_examples "renderedHtmls should not have any errors and set correct page title" do
     subject { page }

yarn.lock

@@ -2449,13 +2449,6 @@ js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
-js-yaml@^3.10.0:
-  version "3.10.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.10.0.tgz#2e78441646bd4682e963f22b6e92823c309c62dc"
-  dependencies:
-    argparse "^1.0.7"
-    esprima "^4.0.0"
-
 js-yaml@^3.5.1:
   version "3.9.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.9.1.tgz#08775cebdfdd359209f0d2acd383c8f86a6904a0"
@@ -3248,6 +3241,13 @@ react-dom@^15.6.1:
     object-assign "^4.1.0"
     prop-types "^15.5.10"
 
+react-on-rails@^10.0.0:
+  version "10.0.0"
+  resolved "https://registry.yarnpkg.com/react-on-rails/-/react-on-rails-10.0.0.tgz#afc658bf23f5dfe3fd836adc178eb4672727a89d"
+  dependencies:
+    react-on-rails "^9.0.3"
+    react-redux "^5.0.6"
+
 react-on-rails@^9.0.0-beta.12:
   version "9.0.1"
   resolved "https://registry.yarnpkg.com/react-on-rails/-/react-on-rails-9.0.1.tgz#49bf7520866214e410e6f88b298e889183d93786"