In Rails when a resource create action fails and calls render :new, why must the URL change to the resource's index url?

Question

I have a resource called Books. It\'s listed as a resource properly in my routes file.

I have a new action, which gives the new view the standard:

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Answer 1

I just started with the Rails-Tutorial and had the same problem. The solution is just simple: If you want the same URL after submitting a form (with errors), just combine the new and create action in one action.

Here is the part of my code, which makes this possible (hope it helps someone^^)

routes.rb (Adding the post-route for new-action):

...
    resources :books
    post "books/new"
...

Controller:

...
def create
    @book = Book.new(book_params)

    if @book.save
        # save was successful
        print "Book saved!"

        else
        # If we have errors render the form again   
        render 'new'
    end
end

def new 
    if book_params
        # If data submitted already by the form we call the create method
        create
        return
    end

    @book = Book.new

    render 'new' # call it explicit
end

private

def book_params
    if params[:book].nil?  || params[:book].empty?
        return false
    else
        return params.require(:book).permit(:title, :isbn, :price)
    end
end

new.html.erb:

<%= form_for @book, :url => {:action => :new} do |f| %>
  <%= f.label :title %>
  <%= f.text_field :title %>

  <%= f.label :isbn %>
  <%= f.text_field :isbn %>

  <%= f.label :price %>
  <%= f.password_field :price %>

  <%= f.submit "Save book" %>
<% end %>