Rails 3.1創建記錄而不是更新？

Question

我有以下引入nokogiri rake任務在我的Rails（3.1）應用：

desc "Import incoming calls" 
task :fetch_incomingcalls => :environment do 

    # Logs into manage.dial9.co.uk and retrieved list of incoming calls. 
    require 'rubygems' 
    require 'mechanize' 
    require 'logger' 

    # Create a new mechanize object 
    agent = Mechanize.new 

    # Load the dial9 website 
    page = agent.get("https://manage.dial9.co.uk/login") 

    # Select the first form 
    form = agent.page.forms.first 
    form.username = 'username 
    form.password = 'password' 

    # Submit the form 
    page = form.submit form.buttons.first 

    # Click on link called Call Logs 
    page = agent.page.link_with(:text => "Call Logs").click 

    # Click on link called Incoming Calls 
    page = agent.page.link_with(:text => "Incoming Calls").click 

    # Output results to file 
    # output = File.open("output.html", "w") { |file| file << page.search("tbody td").text.strip } 

    # Add each row to a new call record 
    page = agent.page.search("table tbody tr").each do |row| 
     next if (!row.at('td')) 
     time, source, destination, duration = row.search('td').map{ |td| td.text.strip } 
     Call.create!(:time => time, :source => source, :destination => destination, :duration => duration) 
    end 
end 

的時間值是在表中的第一行是每次通話唯一的（因爲我們只能收到一個電話在同一時間）。

我想要做的是使用時間值作爲我的通話記錄的唯一標識符。

因此，當刮屏幕，它會「更新」現有的調用（這不會改變，但它是我唯一可以想到的只有導入新調用的方式）。

如果我將其設置爲：

Call.find_all_by_time(nil).each do |call| 

然後：

call.update_attribute(:time, time) 

然後，它會更新現有的記錄，但我希望它導入已不在我們的數據庫記錄 - 基於時間值。

任何幫助表示讚賞！

Answer 1

你的意思是？

# Add each row to a new call record 
page = agent.page.search("table tbody tr").each do |row| 
    next if (!row.at('td')) 
    time, source, destination, duration = row.search('td').map{ |td| td.text.strip } 
    call = Call.find_or_create_by_time(time) 
    call.update_attributes({:time => time, :source => source, :destination => destination, :duration => duration}) 
end