Rails的填充分貝rake任務OpenURI :: HTTPError：500內部服務器錯誤

Question

我試圖讓rake任務從JSON API fixer.io， 填充數據庫，但是當我型我耙：
耙分貝：填充
此錯誤發生：

OpenURI::HTTPError: 500 Internal Server Error 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:16:in `block (5 levels) in <top (required)>' 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:13:in `block (4 levels) in <top (required)>' 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:12:in `each' 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:12:in `block (3 levels) in <top (required)>' 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:11:in `each' 
/home/jakub/Documents/workspace/exch/lib/tasks/populate.rake:11:in `block (2 levels) in <top (required)>' 
Tasks: TOP => db:populate 
(See full trace by running task with --trace) 

這是LIB /我的任務rake任務（populate.rake）：

require 'open-uri' 

namespace :db do 
    desc "Erase and fill database" 
    task :populate => :environment do 
    require 'populator' 

    [ConversionRate].each(&:delete_all) 
    n = JSON.load(open('http://api.fixer.io/latest'))["rates"].keys.count 
    currencies = JSON.load(open('http://api.fixer.io/latest'))["rates"].keys 
    currencies.each do |curr1| 
     currencies.each do |curr2| 
     ConversionRate.populate 1 do |cr| 
      cr.currency1 = curr1 
      cr.currency2 = curr2 
      cr.conversion_rate = JSON.load(open('http://api.fixer.io/latest?base=' + curr1))["rates"][curr2] 
     end 
    end 
    end 
    end 
end 

請幫助我，我不知道是什麼原因導致這個PROBL EM。

Answer 1

主要的問題是在這裏，你是不是服用"rates"

currencies = JSON.load(open('http://api.fixer.io/latest')).keys 

currencies = JSON.load(open('http://api.fixer.io/latest'))["rates"].keys 

---

require 'open-uri' 

namespace :db do 
    desc "Erase and fill database" 
    task :populate => :environment do 
    require 'populator' 

    [ConversionRate].each(&:delete_all) 

    latest_data = JSON.load(open('http://api.fixer.io/latest')) 

    currencies = latest_data["rates"].keys 
    n = currencies.count 

    currencies.each do |curr1| 
     currencies.each do |curr2| 
     ConversionRate.populate 1 do |cr| 
      #take care of any error, as we are going to call third party api here 
      begin 
      cr.currency1 = curr1 
      cr.currency2 = curr2 
      cr.conversion_rate = JSON.load(open('http://api.fixer.io/latest?base=' + curr1))["rates"][curr2] 
      rescue => e 
      puts "error #{e}" 
      end 
     end 
     end 
     #give a bit rest 
     sleep 2 
    end 
    end 
end