rails 三 undefined method `model_name' for ActiveRecord:Relation:Class

rails 3 undefined method `model_name' for ActiveRecord::Relation:Class.
rails 3 form_for 的问题

undefined method `model_name' for ActiveRecord::Relation:Class.

def edit
   @office = Office.where("id = ? AND company_id = ?", params[:id], @company.id )
end

<%= simple_form_for @office, :url => settings_office_path, :html => { :class => "office_form" } do |f| %>
  <h1>Edit <%= @office.office_name %> Details</h1>
  <%= render :partial => 'form', :locals => { :f => f } %>
<% end %>

需要修改

@office = Office.where(:company_id => @company.id).find(params[:id])

@office = @company.offices.find(params[:id])

下面有个人和我类似

class Event < ActiveRecord::Base
  belongs_to :user

  attr_accessible :event_name, :Starts_at, :finish, :tracks
end

class User < ActiveRecord::Base
  has_many :events, :dependent => :destroy

  attr_accessible :name, :event_attributes

  accepts_nested_attributes_for :events,  :allow_destroy => true

end

ActiveRecord::Schema.define(:version => 20101201180355) do

  create_table "events", :force => true do |t|

    t.string   "event_name"
    t.string   "tracks"
    t.datetime "starts_at"
    t.datetime "finish"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "user_id"
  end
end

引用

NoMethodError in Users#index
undefined method `events' for #<ActiveRecord::Relation:0x4177518>

Extracted source (around line #10):

7: <th><%= sortable "Tracks" %></th>

8:   </tr>

10: <% @users.events.each do |event| %>

11: <% debugger %>

12:   <tr>

13:     <td><%= event.starts_at %></td>

Trace of template inclusion: app/views/users/index.html.erb

Rails.root: C:/rails_project1/events_manager
Application Trace | Framework Trace | Full Trace

app/views/users/_event_user.html.erb:10:in `_app_views_users__event_user_html_erb__412443848_34308540_1390678'
app/views/users/index.html.erb:7:in `_app_views_users_index_html_erb___603337143_34316016_0'

问题解决：

@users = User.find(<conditions go here>)
#要变成

@users = User.where(<conditions go here>).all
#或者如下

@users = User.where(:admin => true).where('created_at > ?', min_date).order('created_at').limit(10).all

rails 三 undefined method `model_name' for ActiveRecord:Relation:Class

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