TypeError（字符串不能强制转换为Fixnum）？ [英] TypeError (String can't be coerced into Fixnum)?

问题描述

我得到一个奇怪的错误。我的应用程序在本地主机上运行得很好，但在我的Heroku服务器上出现此错误： TypeError（字符串不能强制转换为Fixnum）：

以下是我的代码：

  @rep = rep_score（@u）
  

根据引发错误的行的日志。我已经发表了评论，并将更改推向Heroku，现在应用运行良好。

以下是 rep_score 方法：

  def rep_score（user）
 rep = 0 
 user.badges.each do | b | 
 rep = rep + b.rep_bonus 
 end 
 return rep 
 end 
  

rep_bonus 是数据库中的整数。

再次， 。让我知道你的想法。

从删除 return 后， rep_score 方法工作正常。我对Ruby还是个新手，把 return 放在哪里是不对的？这是习惯于其他语言。

Ruby使用 + 作为组合工具为字符串和数学情况。

简单修正：

  def rep_score（用户）
 rep = 0 
 user.badges.each do | b | 
 rep = rep + b.rep_bonus.to_i 
 end 
 return rep 
 end 
  

to_i 正在改变 rep_bonus ，这可能来自数据库模型，结果为一个整数。你可以设置几种不同的类型转换。举几个转换：

• 数组： to_a


• 浮点数： to_f


• 整数： to_i li>
  
• 字符串： to_s

I'm getting a weird error. My app runs perfectly fine on my localhost but on my Heroku server it's giving this error: TypeError (String can't be coerced into Fixnum):

Here is my code:

@rep = rep_score(@u)

According to the logs that's the line throwing the error. I've commented it out and pushed the changes to Heroku and the app runs fine now.

Here is the rep_score method:

def rep_score(user)
 rep = 0
 user.badges.each do |b|
   rep = rep + b.rep_bonus
 end
 return rep
end

Also rep_bonus is an integer in the database.

Again this runs perfectly fine on localhost. Let me know what you think.

---

After removing return from the rep_score method it's working fine. I'm still new to Ruby, is there something wrong with putting return? It's habit from other languages.

解决方案

Ruby uses + as a combination tool for strings AND mathematical situations.

Simple fix:

def rep_score(user)
 rep = 0
 user.badges.each do |b|
   rep = rep + b.rep_bonus.to_i
 end
 return rep
end

to_i is changing rep_bonus, which is probably from the database model, from a string result into an integer. There are a few different typecasts you can set. To name a few conversions:

• Array: to_a
• Float: to_f
• Integer: to_i
• String: to_s

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