gmaps4rails =未定义的方法`MODEL_NAME”的NilClass：

类

我与gmaps4rails工作，并试图建立一个新的位置，我得到了错误味精时：‘未定义的方法`MODEL_NAME’的NilClass：类gmaps4rails =未定义的方法`MODEL_NAME”的NilClass：

Extracted source (around line #1): 

1: <%= form_for(@location) do |f| %> 
2: <% if @location.errors.any? %> 
3:  <div id="error_explanation"> 
4:  <h2><%= pluralize(@location.errors.count, "error") %> prohibited this location from being saved:</h2>

这里是控制器：

class LocationsController < ApplicationController 
    # GET /locations 
    # GET /locations.json 

    def index 
    @locations = Location.all 
    @json = Location.all.to_gmaps4rails 
    end 
    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @locations } 
    end 
    end 

    # GET /locations/1 
    # GET /locations/1.json 
    def show 
    @location = Location.find(params[:id]) 
    @json = Location.all.to_gmaps4rails 
    respond_to do |format| 
     format.html # show.html.erb 
     format.json { render json: @location } 
    end 
    end 

    # GET /locations/new 
    # GET /locations/new.json 
    def new 
    #@location = Location.new 
    @json = Location.all.to_gmaps4rails 

    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render json: @location } 
    end 
    end 

    # GET /locations/1/edit 
    def edit 
    @location = Location.find(params[:id]) 
    @json = Location.all.to_gmaps4rails 
    end 

    # POST /locations 
    # POST /locations.json 
    def create 
    #@location = Location.new(params[:location]) 
    @json = Location.all.to_gmaps4rails 
    respond_to do |format| 
     if @location.save 
     format.html { redirect_to @location, notice: 'Location was successfully created.' } 
     format.json { render json: @location, status: :created, location: @location } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @location.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # PUT /locations/1 
    # PUT /locations/1.json 
    def update 
    @location = Location.find(params[:id]) 
    @json = Location.all.to_gmaps4rails 
    respond_to do |format| 
     if @location.update_attributes(params[:location]) 
     format.html { redirect_to @location, notice: 'Location was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render action: "edit" } 
     format.json { render json: @location.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # DELETE /locations/1 
    # DELETE /locations/1.json 
    def destroy 
    @location = Location.find(params[:id]) 
    @location.destroy 
    @json = Location.all.to_gmaps4rails 
    respond_to do |format| 
     format.html { redirect_to locations_url } 
     format.json { head :no_content } 
    end 
    end

模型是这样的：

class Location < ActiveRecord::Base 
    attr_accessible :college_id, :course_id, :id, :name, :latitude, :longitude, :gmaps, :address 

    belongs_to :college 
    has_many :courses 
    acts_as_gmappable 

    def gmaps4rails_address 
    address 
    end 

end

和全跟踪：

activemodel (3.2.9) lib/active_model/naming.rb:163:in `model_name_from_record_or_class' 
activemodel (3.2.9) lib/active_model/naming.rb:158:in `param_key' 
actionpack (3.2.9) lib/action_view/helpers/form_helper.rb:369:in `form_for' 
app/views/locations/_form.html.erb:1:in `_app_views_locations__form_html_erb___716241816_58056000' 
actionpack (3.2.9) lib/action_view/template.rb:145:in `block in render' 
activesupport (3.2.9) lib/active_support/notifications.rb:125:in `instrument' 
actionpack (3.2.9) lib/action_view/template.rb:143:in `render' 
actionpack (3.2.9) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial' 
actionpack (3.2.9) lib/action_view/renderer/partial_renderer.rb:238:in `block in render' 
actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' 
actionpack (3.2.9) lib/action_view/renderer/partial_renderer.rb:237:in `render' 
actionpack (3.2.9) lib/action_view/renderer/renderer.rb:41:in `render_partial' 
actionpack (3.2.9) lib/action_view/helpers/rendering_helper.rb:27:in `render' 
app/views/locations/new.html.erb:3:in `_app_views_locations_new_html_erb___791287105_46366992' 
actionpack (3.2.9) lib/action_view/template.rb:145:in `block in render' 
activesupport (3.2.9) lib/active_support/notifications.rb:125:in `instrument' 
actionpack (3.2.9) lib/action_view/template.rb:143:in `render' 
actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template' 
actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.9) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' 
actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:46:in `block in render_template' 
actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout' 
actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:45:in `render_template' 
actionpack (3.2.9) lib/action_view/renderer/template_renderer.rb:18:in `render' 
actionpack (3.2.9) lib/action_view/renderer/renderer.rb:36:in `render_template' 
actionpack (3.2.9) lib/action_view/renderer/renderer.rb:17:in `render' 
actionpack (3.2.9) lib/abstract_controller/rendering.rb:110:in `_render_template' 
actionpack (3.2.9) lib/action_controller/metal/streaming.rb:225:in `_render_template' 
actionpack (3.2.9) lib/abstract_controller/rendering.rb:103:in `render_to_body' 
actionpack (3.2.9) lib/action_controller/metal/renderers.rb:28:in `render_to_body' 
actionpack (3.2.9) lib/action_controller/metal/compatibility.rb:50:in `render_to_body' 
actionpack (3.2.9) lib/abstract_controller/rendering.rb:88:in `render' 
actionpack (3.2.9) lib/action_controller/metal/rendering.rb:16:in `render' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' 
activesupport (3.2.9) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' 
C:/Ruby192/lib/ruby/1.9.1/benchmark.rb:310:in `realtime' 
activesupport (3.2.9) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:40:in `block in render' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime' 
activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:39:in `render' 
actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.2.9) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.2.9) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.2.9) lib/active_support/callbacks.rb:414:in `_run__350059794__process_action__911521287__callbacks' 
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.2.9) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.2.9) lib/action_controller/metal/params_wrapper.rb:207:in `process_action' 
activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (3.2.9) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.2.9) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.2.9) lib/action_controller/metal.rb:203:in `dispatch' 
actionpack (3.2.9) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.2.9) lib/action_controller/metal.rb:246:in `block in action' 
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:36:in `call' 
journey (1.0.4) lib/journey/router.rb:68:in `block in call' 
journey (1.0.4) lib/journey/router.rb:56:in `each' 
journey (1.0.4) lib/journey/router.rb:56:in `call' 
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:601:in `call' 
warden (1.2.1) lib/warden/manager.rb:35:in `block in call' 
warden (1.2.1) lib/warden/manager.rb:34:in `catch' 
warden (1.2.1) lib/warden/manager.rb:34:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.4.5) lib/rack/etag.rb:23:in `call' 
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/flash.rb:242:in `call' 
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context' 
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/cookies.rb:341:in `call' 
activerecord (3.2.9) lib/active_record/query_cache.rb:64:in `call' 
activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `_run__341585242__call__226313936__callbacks' 
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.9) lib/rails/rack/logger.rb:32:in `call_app' 
railties (3.2.9) lib/rails/rack/logger.rb:16:in `block in call' 
activesupport (3.2.9) lib/active_support/tagged_logging.rb:22:in `tagged' 
railties (3.2.9) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call' 
rack (1.4.5) lib/rack/runtime.rb:17:in `call' 
activesupport (3.2.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.5) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.9) lib/action_dispatch/middleware/static.rb:62:in `call' 
railties (3.2.9) lib/rails/engine.rb:479:in `call' 
railties (3.2.9) lib/rails/application.rb:223:in `call' 
rack (1.4.5) lib/rack/content_length.rb:14:in `call' 
railties (3.2.9) lib/rails/rack/log_tailer.rb:17:in `call' 
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' 
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' 
C:/Ruby192/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
C:/Ruby192/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

有人可以指点我在正确的方向吗？

谢谢！

来源

2013-03-26 Jax

为什么＃ @location = Location.new在def新注释掉了？ – 2013-03-26 17:10:57

嗨，路易斯：是的，我的不好，我在运行一些测试时评论过它，但是在行被注释掉之前，我尝试创建一个新的位置时有同样的错误信息， – Jax 2013-03-26 18:19:02

你使用什么代码来渲染部分？ – 2013-03-26 18:29:35

其实你不要在你的控制器创建的任何位置，@location是nil。这两根线应不被注释：

@location = Location.new # in locations#new 

@location = Location.new(params[:location]) # in locations#create

来源

2013-03-26 17:53:15

我取消注释行和仍然相同的错误。 – Jax 2013-03-26 18:14:08

结束标记丢失在控制器代码底部........不再多说了......

来源

2013-10-11 21:39:20 Jax

gmaps4rails =未定义的方法`MODEL_NAME”的NilClass：

回答

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