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将站点从 Rails 2.2.2 迁移到 Rails 3

我正在运行一个查询并将其存储在变量@user 中,但是当我尝试访问@user 的成员时,我得到一个错误,即使@user 已经水合并且具有“is_admin”的值

### @user.inspect returns
[#<B2bUser id: 398, name: "Tim Test", email: "tim_test@test.com", username: "timtest", password: "foo", is_admin: true, company: "Test Co.", sent_welcome_email: true, created_at: "2011-12-14 08:32:31", send_email_reminders: false, api_username: "api.tim_test@test.com", api_password: "FOOBAR", login_attempts: nil, last_login_attempt_at: nil>]

但是当我从它的角度调用它时:

<% if (@user.is_admin) %> 

我明白了:

Completed 500 Internal Server Error in 15ms

ActionView::Template::Error (undefined method `is_admin' for #<ActiveRecord::Relation:0xaa5db4c>):
    14:
    15:         <%= render :partial => "/warning" %>
    16:
    17:         <% if (@user.is_admin) %>
    18:
    19:                
    20:

在同一视图中,当返回多于 1 行时会发生相同类型的错误(未定义的方法 p.vendor_name),例如:

<% for p in @privileges %>

        <% next if !p.can_setup_purchase_orders and !p.can_setup_instant_electronic_delivery %>

        <h2>For <%= p.vendor_name %></h2>

这是我的控制器

class HomeController < ApplicationController

 before_filter :authenticate

  def index
    @nav = []
    @user = B2bUser.where(:id => request.session[:user_id])
    #logger.debug @user.inspect
    @privileges = B2bPrivilege.lookup_all request.session[:user_id]
    #logger.debug @privileges.inspect

    @can_asn = false
    @can_push_xml = false

    for p in @privileges
      if p.can_setup_advance_ship_notification?
            @can_asn = true and break
        end
         if p.can_setup_xml_pushes?
                @can_push_xml = true and break
            end


    end

  end

end

这是我的方法lookup_all class B2bPrivilege < ActiveRecord::Base

  def B2bPrivilege.lookup_all current_user_id

    #return B2bPrivilege.find(:all, :conditions => "b2b_user_id = #{current_user_id}", :joins => "LEFT JOIN vendors ON vendors.id = b2b_privileges.vendor_id", :select => "b2b_privileges.*, vendors.name AS vendor_name")
    return B2bPrivilege.joins('LEFT JOIN  vendors ON vendors.id = b2b_privileges.vendor_id').where('b2b_user_id' => current_user_id)
    #return B2bPrivilege.find_by_sql["SELECT b2b_privileges.*, vendors.name AS vendor_name FROM b2b_privileges LEFT JOIN vendors ON vendors.id = b2b_privileges.vendor_id WHERE b2b_user_id = ?", current_user_id]
end

我需要以不同的方式访问@user 中的成员吗?这曾经在 Rails 2.2.2/Ruby 1.8.7 中工作

谢谢

4

1 回答 1

1

如果你仔细观察你会发现它@user实际上是一个 ActiveRecord::Relation 对象,而不是一个用户。如果您只打算在该列表中拥有一个用户,那么您可以使用@user.first.is_admin.

@user但是,将其设置为控制器中的第一个结果会更有意义。

更新: rails 中的 where返回一个 Relation,它是一个类似对象的数组。它不返回单个模型记录。改为使用B2bUser.find(request.session[:user_id])来获取单个用户记录。

于 2013-03-12T16:41:45.943 回答