Rails 7 flash errors not displaying in application.html.erb

Question

Having an issue in my Rails 7 app of alerts not showing up.

notices, however, are.

I am displaying alerts in application.html.erb using <%= alert %>

<%= render partial: "shared/navbar" %>
<div class="px-6">
  <div class="mt-6"></div>
  <div>

    <% if notice %>
      <div class="notification is-success is-light text-center">
        <%= notice %>
      </div>
    <% end %>

    <% if alert %>
      <% debugger %>
      <div class="notification is-danger is-light text-center">
        <%= alert %>
      </div>
    <% end %>

    <%= yield %>
  </div>
</div>

I have added a "FAILED" logger to my controller action, which I am seeing in the Rails logs. This proves to me that we are indeed falling into the "else" condition, and the new page is being rendered upon failure to create a new object. However, I do not see the alert message.

def create
@rescue = AnimalRescue.new(rescue_params)

respond_to do |format|
  if @rescue.save
    format.html { redirect_to animal_rescue_url(@rescue), notice: "Rescue was successfully created." }
    format.json { render :show, status: :created, location: @rescue }
  else
    Rails.logger.info "FAILED"
    format.html { render :new, status: :unprocessable_entity, alert: "Unable to create rescue." }
    format.json { render json: @rescue.errors, status: :unprocessable_entity }
  end
end

end

Answer 1

format.html { render :new, status: :unprocessable_entity, alert: "Unable to create rescue." }
# NOTE:                              not a render option  ^^^^^^

:alert and :notice are options for redirect_to method, which set the corresponding flash message:

flash[:alert] = "Unable to create rescue."

Also, flash will only display on the next request after the redirect. To display a flash message in the current request you have to use flash.now:

format.html do
  flash.now.alert = "Unable to create rescue."
  render :new, status: :unprocessable_entity
end

In case your form is inside of the turbo frame, you'll need to display an alert from within the frame.