MessageController中的類型錯誤＃create_message沒有將字符串隱式轉換爲字符串

Question

我正在整合SMS API在Rails應用程序中。雖然從用戶表取號我收到錯誤爲：

TypeError (no implicit conversion of nil into String): 
    app/models/message.rb:16:in `+' 
    app/models/message.rb:16:in `sms_message' 

這是我message.rb

def sms_message 
    require "rubygems" 
    require "net/https" 
    require "uri" 
    require "json" 
    uname = "demo@gmail.com" 
    hash = "54030737b105dsds7777 " 
    numbers = numbers 
    message = body 
    sender = "TXTLCL" 
    requested_url = 'http://api.textlocal.in/send/?' + "username=" + uname + "&hash=" + hash + "&numbers=" + numbers + "&message=" + body + "&sender=" + sender 
    uri = URI.parse(requested_url) 
    http = Net::HTTP.start(uri.host, uri.port) 
    request = Net::HTTP::Get.new(uri.request_uri) 
    res = http.request(request) 
    response = JSON.parse(res.body) 
    puts (response) 
end 

def message_number 
    numbers = Student.new do |u| 
    u.phone1 = numbers 
    end 
end 

Answer 1

Rails有一個名爲to_query不錯的方法。 首先，建立params散列，像這樣：

params = {username: uname, hash: hash, numbers: numbers, message: body, sender: sender} 

然後，只需調用"http://api.textlocal.in/send/?#{params.to_query}"

params.to_query將採取零值的照顧。

但是，這只是編寫代碼的好方法。如果值爲零，您仍然會得到相同的錯誤。更好的是在進行API調用之前添加一些驗證。此外，請確保您是否發送API預期的確切密鑰。

Answer 2

你得到numbers或body爲nil

爲了避免這種情況，你可以轉換這些值串或使用插值

轉換串

numbers = numbers.to_s 
message = body.to_s # Use message instead of body while joining using + 
requested_url = 
    'http://api.textlocal.in/send/?' + "username=" + uname + "&hash=" + hash + 
    "&numbers=" + numbers + "&message=" + message + "&sender=" + sender 

使用插值

requested_url = 
    "http://api.textlocal.in/send/?username=#{uname}&hash=#{hash}&numbers=#{numbers}&message=#{message}&sender=#{sender}"