自定义表单被处理为JS而非HTML的问题排查求助

Hey there! Let's break down why your custom edit form is being handled as JS instead of HTML, even after removing Turbolinks (and with other scaffold-generated forms working perfectly). Here are the top things to check:

• Check for remote/turbo attributes in your form
  Even without Turbolinks, your form might have leftover attributes that force AJAX submission. Look for data-remote="true" (older Rails versions) or data-turbo="true" (Rails 7+). Also, since form_with defaults to remote: true in many Rails versions, make sure you add local: true to explicitly enable HTML submission:

  <%= form_with(model: @user_data, url: edit_contact_path, local: true, format: :html) do |form| %>
    <!-- Your form fields go here -->
  <% end %>
  

• Verify your route doesn't restrict to JS format
  Open config/routes.rb and check if your edit_contact route has a format: :js constraint. If it looks like this:

  get 'edit_contact', to: 'user_data#edit_contact', format: :js
  

  Update it to allow HTML (or remove the format constraint entirely for default behavior):

  get 'edit_contact', to: 'user_data#edit_contact', formats: [:html, :js]
  

• Inspect the form's rendered action URL
  Look at the HTML source of your form—does the action attribute end with .js? For example: <form action="/user_data/edit_contact.js" ...>? That would force a JS request. Make sure your form builder isn't specifying format: :js, and instead explicitly sets format: :html.

• Ensure your controller responds to HTML
  Check the edit_contact method in your UserDataController. If you use a respond_to block, make sure format.html is included:

  class UserDataController < ApplicationController
    def edit_contact
      @user_data = current_user.user_data # Example setup
      respond_to do |format|
        format.html # This line is critical for HTML processing
        format.js # Keep only if you need JS handling functionality
      end
    end
  end
  

  If there's no respond_to block, Rails will automatically look for an edit_contact.html.erb template—just confirm this template exists in your views folder.

• Clear your browser cache
  Old cached form HTML can cause unexpected behavior. Do a hard refresh (Ctrl+Shift+R on Windows/Linux, Cmd+Shift+R on Mac) or clear your browser cache to load the latest version of your form.

内容的提问来源于stack exchange，提问作者Patricio S