根據條件在哈希中添加密鑰

Question

我有以下方法

def some_method
   ...do something here...

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

如果變量customer為true ，我想在@customer_info中添加鍵c，例如，

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

試圖做這樣的事情，但沒有運氣

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

Answer 1

@customer_info[:c] = something if customer

Answer 2

也許您只是想念? 在您的三元運算符中？

您的方法似乎在控制台中對我有用：

> 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} 

所以這：

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

應該更像：

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

---

快速更新

正如評論中指出的那樣，它應該更像是：

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

評論員很好地解釋了原因。