Rails在模型中创建 - 属性除外

Question

我正在从:expense

创建:recurringexpense

:recurring expense的属性不在:expense。

我认为这样可行：

def copy_to_expense
  @recurringexpense = Recurringexpense.find(params[:id]) # find original recurring expense
  @expense = Expense.create(@recurringexpense.attributes).except(:frequency, :last_date)

  redirect_to @recurringexpenses, notice: 'Expense was successfully created.'
end

但是，我得到了这个：

unknown attribute: frequency

Answer 1

您只需要直接在属性哈希上调用except：

@expense = Expense.create(@recurringexpense.attributes.except(:frequency, :last_date))

正如您在评论中所述，您还需要确保except参数中的键是正确的类型。您也可以使用

执行此操作

.attributes.symbolize_keys.except(...)