如何從哈希數組中獲取所需的哈希

Question

我有一系列形式的哈希：

[{"status"=>"Unshipped", "city"=>"thane", "buyer_name"=>"abc", "name"=>"abc def", "countryCode"=>"IN", "payment_method"=>"COD", "order_type"=>"StandardOrder", "y_id"=>"r123", "phone"=>"12345", "state"=>"Maharashtra", "service"=>"Expedited", "address_1"=>"abc xyz", "address_2"=>"yyyy", "postalCode"=>"400607", "shipped_by_y"=>"false", "channel"=>"MFN", "amout"=>"350.00"}, {"status"=>"Unshipped", "city"=>"Chembur, Mumbai", "buyer_name"=>"xyz", "name"=>"xyz lmn", "countryCode"=>"IN", "payment_method"=>"Other", "order_type"=>"StandardOrder", "y_id"=>"r124", "phone"=>"12436", "state"=>"Maharashtra", "service"=>"Expedited", "address_1"=>"add 1", "address_2"=>"add 2", "postalCode"=>"400071", "shipped_by_y"=>"false", "channel"=>"MFN", "amout"=>"399.00"}]

我要從此數組中選擇具有鍵y_id值的元素。 例如。 如果我想使用'y_id' = 'r124'獲得元素，我應該得到：

{"status"=>"Unshipped", "city"=>"Chembur, Mumbai", "buyer_name"=>"xyz", "name"=>"xyz lmn", "countryCode"=>"IN", "payment_method"=>"Other", "order_type"=>"StandardOrder", "y_id"=>"r124", "phone"=>"12436", "state"=>"Maharashtra", "service"=>"Expedited", "address_1"=>"add 1", "address_2"=>"add 2", "postalCode"=>"400071", "shipped_by_y"=>"false", "channel"=>"MFN", "amout"=>"399.00"}

Answer 1

您應該使用find API。 它返回與您要查找的內容匹配的第一個元素；如果未找到，則返回nil ：

arr.find { |element| element['y_id'] == 'r124' }

將返回：

{"status"=>"Unshipped", "city"=>"Chembur, Mumbai", "buyer_name"=>"xyz", "name"=>"xyz lmn", "countryCode"=>"IN", "payment_method"=>"Other", "order_type"=>"StandardOrder", "y_id"=>"r124", "phone"=>"12436", "state"=>"Maharashtra", "service"=>"Expedited", "address_1"=>"add 1", "address_2"=>"add 2", "postalCode"=>"400071", "shipped_by_y"=>"false", "channel"=>"MFN", "amout"=>"399.00"}

Answer 2

您應該可以使用

arr.find { |i| i['y_id] == *value* }

這將遍歷您的哈希數組，其中i是任何給定的哈希值。 Select將返回一個對象數組，其中該塊解析為true 。

因此，例如，如果您傳入r123作為value ，它將返回

{"status"=>"Unshipped", "city"=>"thane", "buyer_name"=>"abc", "name"=>"abc def", "countryCode"=>"IN", "payment_method"=>"COD", "order_type"=>"StandardOrder", "y_id"=>"r123", "phone"=>"12345", "state"=>"Maharashtra", "service"=>"Expedited", "address_1"=>"abc xyz", "address_2"=>"yyyy", "postalCode"=>"400607", "shipped_by_y"=>"false", "channel"=>"MFN", "amout"=>"350.00"}

得到哈希。 （感謝@BroiSatse）