如何使用Ruby將哈希值附加到另一個值

Question

我有一個哈希：

{:userdata=>["field: email,start: 0,end: 0"]}

我想添加到另一個像這樣的哈希：

{:userdata=>["field: resource.attributes.account_source.iban,start: 0,end: 0", "field: resource.attributes.account_source.person_name,start: 0,end: 0", "field: resource.attributes.account_target.iban,start: 0,end: 0", "field: resource.attributes.account_target.person_name,start: 0,end: 0"], :iddata=>["field: resource.attributes.account_source.account_id,start: 0,end: 0", "field: resource.attributes.account_source.person_id,start: 0,end: 0", "field: resource.attributes.account_target.account_id,start: 0,end: 0", "field: resource.attributes.account_target.person_id,start: 0,end: 0"], :infodata=>["field: resource.attributes.reason,start: 0,end: 0"], :balancedata=>["field: resource.attributes.amount,start: 0,end: 0"]}

第二個散列和值數組中有多個鍵，因此我需要將值添加到正確的位置，這應該類似於：

 {:userdata=>["field: resource.attributes.account_source.iban,start: 0,end: 0", "field: resource.attributes.account_source.person_name,start: 0,end: 0", "field: resource.attributes.account_target.iban,start: 0,end: 0", "field: resource.attributes.account_target.person_name,start: 0,end: 0", "field: email,start: 0,end: 0"], ....

第二個哈希值比較復雜，可能包含與我嘗試“合並”的哈希值相同的鍵，但是當然缺少該值，這就是我要在第二個哈希值中添加的值。

Answer 1

您可以將Hash#merge與一個塊一起使用，並使用Array#| 得到兩個數組的並集：

h1 = { userdata: ['field: email,start: 0,end: 0'] }
h2 = { userdata: ['field: resource.attributes.account_source.iban,start: 0,end: 0', 'field: resource.attributes.account_source.person_name,start: 0,end: 0', 'field: resource.attributes.account_target.iban,start: 0,end: 0', 'field: resource.attributes.account_target.person_name,start: 0,end: 0'], iddata: ['field: resource.attributes.account_source.account_id,start: 0,end: 0', 'field: resource.attributes.account_source.person_id,start: 0,end: 0', 'field: resource.attributes.account_target.account_id,start: 0,end: 0', 'field: resource.attributes.account_target.person_id,start: 0,end: 0'], infodata: ['field: resource.attributes.reason,start: 0,end: 0'], balancedata: ['field: resource.attributes.amount,start: 0,end: 0'] }

h3 = h1.merge(h2) { |_, old_array, new_array| new_array | old_array | }
# {:userdata=>["field: resource.attributes.account_source.iban,start: 0,end: 0", "field: resource.attributes.account_source.person_name,start: 0,end: 0", "field: resource.attributes.account_target.iban,start: 0,end: 0", "field: resource.attributes.account_target.person_name,start: 0,end: 0", "field: email,start: 0,end: 0"], :iddata=>["field: resource.attributes.account_source.account_id,start: 0,end: 0", "field: resource.attributes.account_source.person_id,start: 0,end: 0", "field: resource.attributes.account_target.account_id,start: 0,end: 0", "field: resource.attributes.account_target.person_id,start: 0,end: 0"], :infodata=>["field: resource.attributes.reason,start: 0,end: 0"], :balancedata=>["field: resource.attributes.amount,start: 0,end: 0"]}

注意:userdata和'userdata'不是相同的Ruby對象，並且在哈希中不被視為相同的鍵。

最后，哈希中的值不是哈希，而是字符串數組。 具有相同字段但值不同的兩個字符串將被認為是完全不同的：

['field: a'] | ['field: a, value: 1']
# ["field: a", "field: a, value: 1"]

如果您需要哈希的功能，請使用Hash 。