Find in array of hashes

gistfile1.rb

items = [
    {
         :condition => "NewItem",
        :seller_sku => "bsgnpoprod_142829029X_41",
              :asin => "142829029X",
          :quantity => "1"
    },
    {
         :condition => "UsedGood",
        :seller_sku => "bsgnpoprod_142829029X_42",
              :asin => "142829029X",
          :quantity => "1"
    },
    {
         :condition => "UsedGood",
        :seller_sku => "bsgnpoprod_142829029X_43",
              :asin => "142829029X",
          :quantity => "1"
    },
    {
         :condition => "UsedGood",
        :seller_sku => "bsgnpoprod_1403975078_44",
              :asin => "1403975078",
          :quantity => "1"
    }
]

items = [ [ { :condition => "NewItem", :seller_sku => "bsgnpoprod_142829029X_41", :asin => "142829029X", :quantity => "1" }, { :condition => "UsedGood", :seller_sku => "bsgnpoprod_142829029X_42", :asin => "142829029X", :quantity => "1" }, { :condition => "UsedGood", :seller_sku => "bsgnpoprod_142829029X_43", :asin => "142829029X", :quantity => "1" }, { :condition => "UsedGood", :seller_sku => "bsgnpoprod_1403975078_44", :asin => "1403975078", :quantity => "1" } ] ]

'1403975078'  => 1
'142829029X'  => 3

>> items.flatten.count {|h| h[:asin] == '1403975078'}
1
>> items.flatten.count {|h| h[:asin] == '142829029X'}
3