Render `<form>` with `form_tag` with `form_with`

This commit refactors our application’s View code by replacing our notes#new template’s call to form_tag with a call to form_with.

The form_with helper’s behavior is very similar to the form_tag‘s. In addition to generating a CSRF Protection-compliant <form> element, the form_with helper will yield an instance of an [ActionView::Helpers::FormBuilder]. This commit doesn’t yet make use of that instance, but its availability will enable future View layer refactorings.

The form_with helper is invoked with the local: true option to opt-out of submitting form asynchronously through Rails’ Unobtrusive JavaScript (there will be more on that topic in future commits).

When we run the test again after making this change, it still passes.


      app/views/notes/new.html.erb

diff --git a/app/views/notes/new.html.erb b/app/views/notes/new.html.erb
index 8c45414..d7d7f0e 100644
--- a/app/views/notes/new.html.erb
+++ b/app/views/notes/new.html.erb
@@ -1,4 +1,4 @@
-<%= form_tag "/notes", method: :post do %>
+<%= form_with(url: "/notes", method: :post, local: true) do %>
   <label for="content">Message</label>
   <textarea id="content" name="content"></textarea>

Render <form> with form_tag with form_with

Render `<form>` with `form_tag` with `form_with`