Rails 7 failed save only shows errors if I render with a status-CodePudding

I've been working with rails for a while, but I thought I'd try a course to cement my knowledge.

But I already get stumped on a basic save/error action.

I am trying to show error messages after model validation fails.

If the model validation fails, I render 'new'again, where the model instance should have error messages. But if I try to print the error messages like <%= modelinstance.errors.inspect %> it just shows an empty array.

The weird thing is, if I instead do render :new, status: :unprocessable_entity it gladly renders the whole error thing.

I was just wondering why this is the case, when the ruby on rails guide is allowing the string version.

Controller:

...
def index
    articles = Article.all

    render locals: {
        articles: articles
    }
end

def new
    @article = Article.new
end

def create
    @article = Article.new(article_params)

    if @article.save
        redirect_to @article
    else
        render :new, status: :unprocessable_entity
    end

end
...

View:

<h1>Create a new article</h1>

<% if @article.errors.any? %>
    <h2>The following errors prevented the article from saving:</h2>
    <% @article.errors.full_messages.each do |msg| %>
        <%= msg %>
    <% end %>
<% end %>

    ...
    <%= form_with scope: @article, url: articles_path, local: true do |f| %>
        <p>
            <%= f.label :title %>
            <%= f.text_field :title %>
        </p>
        <p>
            <%= f.label :description %>
            <%= f.text_area :description %>
        </p>
        <p>
         <%= f.submit %>
        </p>
    <% end %>'
    ...

CodePudding user response：

It's due to the introduction of Turbo in Rails 7. Without that status, Turbo wouldn't really know what to do with the redirects.

Otherwise, you could just disable Turbo and it should go back to "normal".