如何从ID获取用户名

Question

I want to get the name of the caller by the caller_id. 我想通过caller_id获取呼叫者的姓名。 Name is in the user table. 名称在用户表中。

Here's the migration file. 这是迁移文件。

class AddCallerIdToSeller < ActiveRecord::Migration
  def change
    add_column :users, :caller_id, :string
  end
end

This is the view that I am currently doing. 这是我目前正在做的观点。

 <td class="text-center"><%= call_report.caller_id.present? %></td>

When i do like above, it shows true. 当我像上面一样时，它显示为true。 But I want to get the user name which is "=" caller_id 但是我想获取的用户名是“ =“ caller_id

Answer 1

User.find(call_report.caller_id).name

在控制器中执行此操作并将其分配给那里的某个变量的最佳方法。

Answer 2

If you do this... 如果你这样做

class CallReport < ApplicationRecord
  belongs_to :user
end

You can then do 然后你可以做

call_report.user.name

Also the ID is normally stored as an integer, so it's more typical to see... ID通常也存储为整数，因此更常见的是...

add_column :users, :caller_id, :integer

I'd do a rake db:rollback then make the above change then rake db:migrate 我会做一个rake db:rollback然后做上面的改变然后rake db:migrate