Flash message with html_safe from the controller in Rails 4 (safe version)

Question

In my controller I have the following code:

    format.html { redirect_to new_customer_url,
                notice: %Q         


        

Answer 1

Here is one possible way to solve this problem. Add a before filter to your ApplicationController which will make flash[:notice] html safe only if flash[:html_safe] is set. Then you can control when and when not to make notices html safe completely from the controller.

before_filter -> { flash.now[:notice] = flash[:notice].html_safe if flash[:html_safe] && flash[:notice] }

Then your example could be modified to this:

format.html do
  redirect_to(
    new_customer_url,
    notice: %Q[ A customer already exists with with this shopping id. Edit this customer #{view_context.link_to("here", edit_customer_url(@duplicate))}.],
    flash: { html_safe: true }
  )
end