Ruby on rails Ruby：在二维散列上迭代

我正在尝试创建一个二维数组，就像这样

@transactions = {}
@expenses.each do |expense|
  @transactions[expense.id.to_s + '-expense'] = {'identifier' => expense.id.to_s + '-expense', 'id' => expense.id, 'type' => 'expense', 'issued_on' => expense.issued_on, 'amount' => expense.amount}
end

@invoices.each do |invoice|
  @transactions[invoice.id.to_s + '-invoice'] = {'identifier' => invoice.id.to_s + '-invoice', 'id' => invoice.id, 'type' => 'invoice', 'issued_on' => invoice.issued_on, 'amount' => invoice.total}
end

| 1-expense |
| identifier: 1-expense, id: 1, type: expense, issued_on: 2012-05-03, amount: 8.99 |
| 2-expense |
| identifier: 2-expense, id: 2, type: expense, issued_on: 2012-05-25, amount: 4.96 |
| 3-expense |
| identifier: 3-expense, id: 3, type: expense, issued_on: 2012-05-01, amount: 56.08 |

但是当我迭代数组来创建行时，它会首先给我一个键，然后是整个数组，就像这样

@transactions = {}
@expenses.each do |expense|
  @transactions[expense.id.to_s + '-expense'] = {'identifier' => expense.id.to_s + '-expense', 'id' => expense.id, 'type' => 'expense', 'issued_on' => expense.issued_on, 'amount' => expense.amount}
end

@invoices.each do |invoice|
  @transactions[invoice.id.to_s + '-invoice'] = {'identifier' => invoice.id.to_s + '-invoice', 'id' => invoice.id, 'type' => 'invoice', 'issued_on' => invoice.issued_on, 'amount' => invoice.total}
end

| 1-expense |
| identifier: 1-expense, id: 1, type: expense, issued_on: 2012-05-03, amount: 8.99 |
| 2-expense |
| identifier: 2-expense, id: 2, type: expense, issued_on: 2012-05-25, amount: 4.96 |
| 3-expense |
| identifier: 3-expense, id: 3, type: expense, issued_on: 2012-05-01, amount: 56.08 |

我迭代创建行当然，我应该做一些类似transaction.id或transaction.u的事情，但我会调试，这样你就可以明白我的意思了

<% @transactions.each do |transaction| %>
  <tr class="<%= cycle("odd", "even") %>">
    <td>
      <%= debug transaction %>
    </td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <% end %>

当我的桌子看起来像这样的时候

| identifier: 1-expense, id: 1, type: expense, issued_on: 2012-05-03, amount: 8.99 |
| identifier: 2-expense, id: 2, type: expense, issued_on: 2012-05-25, amount: 4.96 |
| identifier: 3-expense, id: 3, type: expense, issued_on: 2012-05-01, amount: 56.08 |

---

我不知道如何只创建一个包含事务数据行的简单表，而不创建包含哈希键的额外行

您使用{}语法创建了一个哈希，而不是数组

如果您只想在没有键的情况下迭代哈希值，可以执行以下操作：

<% @transactions.each_value do |transaction| %>
...

或者，可以使用数组来保存行：

@transactions = []
@expenses.each do |expense|
  @transactions << {'identifier' => expense.id.to_s + '-expense', 'id' => expense.id, 'type' => 'expense', 'issued_on' => expense.issued_on, 'amount' => expense.amount}
end

@invoices.each do |invoice|
  @transactions << {'identifier' => invoice.id.to_s + '-invoice', 'id' => invoice.id, 'type' => 'invoice', 'issued_on' => invoice.issued_on, 'amount' => invoice.total}
end

然后，您现有的erb模板应该工作得更好