Ruby on Rails - Delete something from an array

Question

I have a question with this code. In this view I iterate over an array but I want to have the option to delete an entry from the array. Here is my code

view

<table>
  <tr>
    <th>Ware</th>
    <th>Anzahl</th>
    <th>Einzelpreis</th>
    <th>Gesamtpreis</th>
  </tr>
  <% counter = 0 %>
    <% $itemarray.each do |iarray| %>
    <tr>
      <% @items.each do |item| %>
        <% if iarray.to_i == item.id %>
          <th> <%= item.name %> </th>
          <th> <%= $anzahlarray[counter] %> </th>
          <th> <%= item.price.round(2) %> € </th>
            <% preistemp = preistemp = item.price * $anzahlarray[counter].to_f %>
          <th> <%= preistemp.round(2) %> € </th>

          <th> <%= link_to 'Show', item_path(item) %> </th>
          <th> <%= link_to 'Destroy', :hidden_param => 'counter' , method: :deleteshoppingcartentry(counter), data: {confirm: 'Are you sure?' }%></th>
        <% end %>
      <% end %>
    </tr>  
    <% counter += 1 %>
  <% end %>
</table>

controller

def deleteshoppingcartentry
   $itemarray.delete_at($entrynumber)
   $anzahlarray.delete_at($entrynumber)

   redirect_to "/orders/new"
end

maybe you could help me out

Are you using any database? or you just keep your data in global variables? — Nafaa Boutefer
– Nafaa Boutefer, Commented Mar 8, 2015 at 16:13
no i in this case i dont use a database. i store it in a global Array variable and want to delete a certan entry from the array. the delete Option is listed with the items but i dont know how i can delete it. — iMarv
– iMarv, Commented Mar 8, 2015 at 17:44
Your code is very hard to understand: Where does $itemarray come from and where does @item come from? BTW: In ruby it's note neccesary to use a $ to declare a variable. Then: In your 'destroy'-link you are calling the deleteshoppingcartentry with an attribute counter, but in your definition of this method you assign no attribute. — Klaus
– Klaus, Commented Mar 8, 2015 at 18:00
The global variables are filled from the cookies, and I use them in the whole controller, so I declared them global. the attribute was just a test from me, but I am really clueless how i could delete the certain entry from the array. — iMarv
– iMarv, Commented Mar 9, 2015 at 8:54

user626511 · Accepted Answer · 2015-03-09 08:51:32Z

1

You can't delete items from a global array variable. Use a database instead. Learn more about Rails' ActiveRecord.

answered Mar 9, 2015 at 8:51

user626511

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