Question

我有以下方法

def some_method
   ...do something here...

    @customer_info = {
      a: a,
      b: b
    }
end

如果变量customer为true，我想在@customer_info中添加密钥c 等等，

@customer_info = {
  a: a,
  b: b,
  c: something if customer is true
}

试图做这样的事但没有运气

@customer_info.merge(customer.present? {c: something} : {})

Answer 1

@customer_info[:c] = something if customer

Answer 2

也许您只是在三元运算符中遗漏了?？

您的方法似乎在我的控制台中起作用：

> customer_info = {a: :a, b: :b}
 => {:a=>:a, :b=>:b} 
> c = false
 => false 

> customer_info.merge(c ? {c: c} : {})
 => {:a=>:a, :b=>:b} 

> c = true
 => true 
> customer_info.merge(c ? {c: c} : {})
 => {:a=>:a, :b=>:b, :c=>true}

所以，这个：

@customer_info.merge(customer.present? {c: something} : {})

应该更像是：

@customer_info.merge(customer.present? ? {c: something} : {})

快速更新

正如评论中所指出的，这应该更像是：

@customer_info.merge!({c: something}) if customer.present?

评论员很好地解释了原因。

根据条件添加哈希键

2 个答案: