Reload Instance Variable Hot Wire

Question

I have a product counter in my index.html.erb as follows:

<p class='text-sm'><%= @products.count %> Products</p>

@products is instantiated in the controller method as follows:

def index
    @products = Product.all
end

In the controller I have a delete action, when it is successful it redirects back to the index page:

def destroy
    @product = Product.find(params[:id])
    @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url }
      format.json { head :no_content }
    end
  end

However my @products.count does not update. I am using Rails 7 with Hotwire.

Having a look at my logs, the following happens on redirect:

Started GET "/products" for 127.0.0.1 at 2021-12-22 18:57:58 +0000
Processing by ProductsController#index as TURBO_STREAM

Do instance variables reload automatically on redirect, and if not, how can I make it reload?

Answer 1

Its possible there was an issue with the objects destruction. Like an association that will break if you delete it. That's why you should use the destroy method as a conditional to make sure it only redirects if destroy was successful

def destroy
  @product = Product.find(params[:id])
  if @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url }
      format.json { head :no_content }
    end
  else
    ... there was an issue destroying
  end
end