syntax issue iterating through array of items in Rails

Question

I am trying to post some data to a web service from jQuery:

  var jtvals={};
  jtvals['line_items']=[];
  var g={"name":"jon"};
  var h={"name":"joan"};

  jtvals['line_items'].push(g);
  jtvals['line_items'].push(h);

  $.ajax({
    url: '/arc/v1/api/calculate_line_items',
    type: 'POST',
    data: jtvals,
    dataType: 'json'
  }).done(function(r){
    alert('this is finished');
  });

Rails:

  def calculate_line_items
    line_items=params[:line_items]
    puts line_items
    puts line_items.count
    puts "DO LOOP:"

    line_items.each_with_index do |tmp_line_item, idx|
        puts "idx:"
        puts idx

        puts "about to give you:"
        puts tmp_line_item
        puts "after giving you:"

and the params look like this:

however, it is erroring out with:

  Parameters: {"line_items"=>{"0"=>{"name"=>"jon"}, "1"=>{"name"=>"joan"}}}
{"0"=>{"name"=>"jon"}, "1"=>{"name"=>"joan"}}
2
DO LOOP:
idx:
0
about to give you:
0
{"name"=>"jon"}
after giving you:
Completed 500 Internal Server Error in 2ms (ActiveRecord: 0.0ms)

TypeError (no implicit conversion of String into Integer):
  app/controllers/api_orders_controller.rb:41:in `[]'
  app/controllers/api_orders_controller.rb:41:in `block in calculate_line_items'
  app/controllers/api_orders_controller.rb:33:in `each_with_index'
  app/controllers/api_orders_controller.rb:33:in `calculate_line_items'

And I'm not sure why it's treating the key of the array as output. How would I fix this?

elements · Accepted Answer · 2015-10-21 23:41:20Z

1

If you want tmp_line_item to return {"name"=>"jon"} and {"name"=>"joan"}, then try:

line_items.each_with_index do |(k, tmp_line_item), idx|
  ...

answered Oct 21, 2015 at 23:41

elements

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2 Comments

timpone Over a year ago

weird, why is that? Is that a Rails issue - I thought it would go in a straight array.

elements Over a year ago

@timpone Here's a (brief) explanation I found: makandracards.com/makandra/…. Is that what you're wondering about?

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