更新后如何返回上一页？

Question

How can I go back to the previous page (where the items in question were listed) from the edit view (edit.html.erb) after clicking on the update button? I have tried:

redirect_to request.referer #stays on the same page(edit.html.erb) 
redirect_to session.delete(:return_to) #outputs "Cannot redirect to nil!"
redirect_to :back #stays on same page
redirect_back fallback_location: posts_path #stays on same page
redirect_to(request.env['HTTP_REFERER']) #stays on same page

In the database, the comment is updated.

While I can use posts_path(@comment), I want to also edit comment from another url. Hence the need for a redirect to the previous page.

Answer 1

You can't call request.referer to directly back the the previous of edit page. Cause on the update method, the request.referer will be always the edit path.

You can, do a trick like, parse the request.referer of edit action (might be the index one, for ex. as params to update action, and redirect to the path on updating the resource )

# edit form view
<%= hidden_field_tag :previous_request, request.referer %>

# update action
def update
  ...
  redirect_to params[:previous_request]
end