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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| %>   
Edit <%= @office.office_name %> Details
   <%= 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

[quote] 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' [/quote] 问题解决：

@users = User.find(
   
    ) #要变成 @users = User.where(
    
     ).all #或者如下 @users = User.where(:admin => true).where('created_at > ?', min_date).order('created_at').limit(10).all
    
   

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