遍历数据库中的每个记录-Ruby on Rails/ActiveRecord [英] Iterating through every record in a database - Ruby on Rails / ActiveRecord

问题描述

n00b问题.我试图遍历数据库中的每个用户记录.伪代码可能看起来像这样:

n00b question. I'm trying to loop through every User record in my database. The pseudo code might look a little something like this:

def send_notifications

        render :nothing => true

        # Randomly select Message record from DB
        @message = Message.offset(rand(Message.count)).first

        random_message = @message.content

        @user = User.all.entries.each do
            @user = User.find(:id)

            number_to_text = ""

            @user.number = number_to_text #number is a User's phone number
            puts @user.number

        end

    end

有人可以帮我找到最好的方法吗?语法上的一点帮助也将非常有用:)

Can someone fill me in on the best approach for doing this? A little help with the syntax would be great too :)

推荐答案

这是遍历所有User的正确语法:

Here is the correct syntax to iterate over all User :

User.all.each do |user|
  #the code here is called once for each user
  # user is accessible by 'user' variable
end

要提高性能并减少负载，请使用User.find_each(请参阅doc )，而不是User.all.请注意，使用find_each会失去排序的能力.

To improve performance and decrease load, use User.find_each (see doc) instead of User.all. Note that using find_each loses the ability to sort.

这篇关于遍历数据库中的每个记录-Ruby on Rails/ActiveRecord的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！