react-rails v3.1.0 is broken

[chtzvt]

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Steps to reproduce

To reproduce this issue, follow the basic installation steps described in the README using the latest version of react-rails (3.1.0 at the time of writing).

Expected behavior

Following the steps described in the README should allow the HelloWorld example component to render in a view.

Actual behavior

Rendering the view fails:

> rails s
=> Booting Puma
=> Rails 7.0.7 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.6.7 (ruby 3.1.2-p20) ("Birdie's Version")
*  Min threads: 5
*  Max threads: 5
*  Environment: development
*          PID: 19068
* Listening on http://127.0.0.1:3000
* Listening on http://[::1]:3000
Use Ctrl-C to stop
Started GET "/" for 127.0.0.1 at 2023-08-20 20:15:25 -0400
Processing by HomeController#index as HTML
  Rendering layout layouts/application.html.erb
  Rendering home/index.html.erb within layouts/application
  Rendered home/index.html.erb within layouts/application (Duration: 2.8ms | Allocations: 4135)
  Rendered layout layouts/application.html.erb (Duration: 2.9ms | Allocations: 4247)
Completed 500 Internal Server Error in 8ms (ActiveRecord: 0.0ms | Allocations: 8205)



ActionView::Template::Error (uninitialized constant React::Rails::ComponentMount::Dummy

              null_to_undefined: Dummy::Application.config.react.null_to_undefined_props
                                 ^^^^^):
    2: <p>Find me in app/views/home/index.html.erb</p>
    3:
    4: <!-- erb: paste this in view -->
    5: <%= react_component("HelloWorld", { greeting: "Hello from react-rails." }) %>

app/views/home/index.html.erb:5
^C- Gracefully stopping, waiting for requests to finish
=== puma shutdown: 2023-08-20 20:21:16 -0400 ===
- Goodbye!
Exiting

System configuration

• Shakapacker or Sprockets version: 7.0.0
• React-Rails version: 3.1.0
• Rect_UJS version: 3.1.1
• Rails version: 7.0.7
• Ruby version: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]

---

(Describe your issue here)

It appears that this issue is related to #1293. Specifically, I've traced the issue back here, where the issue seems to have been caught during a review of the PR (and yet, somehow still released).

[justin808]

@chtzvt Please use 3.1.1.