Action for a borrow button on the Rails

Question

I’m just starting out on ruby on Rails and I’m having a question I need to make a library, I created and I am listing the books, I created a borrow button in each book unit and then this my problem I want to make this button to be clicked already take to the loan page the book ID, I even managed to do that but when I’m going to save the loan he makes a mistake.

I created this method:

def load_livro
      if params[:livro_id]
        @livro = livro.find(params[:livro_id])
      else
        @livro = livro.new
      end
 end

And I called him so:

Lend button on app/views/books/index.html.erb:

<td class="col-xs-1"><%= link_to 'Emprestar', "/emprestimo/new/#{emprestimo.id}" %></td>

And on the loan page I used so:

<%= f.hidden_field :livro_id, :value => @livro.id %>

In this last line of code the following error occurred:

Undefined local variable or method 'livro'  did  you mean? livro_url

Code snippet with line 4 error:

3 <div class="form-group">

4   <%= f.hidden_field :livro_id, :value => @livro.id %>

5 </div>

Answer 1

Class name should always come with uppercase letter, example: Livro.find, therefore the mistake Undefined local variable or method 'livro'

def load_livro
      if params[:livro_id]
        @livro = Livro.find(params[:livro_id])
      else
        @livro = Livro.new
      end
 end