語法問題，通過項目的數組中的Rails迭代

Question

我嘗試了一些數據後從jQuery的web服務：

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'); 
    }); 

的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:" 

和PARAMS是這樣的：

然而，它示數出有：

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' 

而我不知道爲什麼它把數組的鍵作爲輸出。我將如何解決這個問題？

Answer 1

如果你想tmp_line_item返回{"name"=>"jon"}和{"name"=>"joan"}，然後嘗試：

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