我有这个型号：
class ToType < ActiveRecord::Base
attr_accessible :Name, :TYP_CCM, :TYP_CCM_TAX, :TYP_CDS_ID, :TYP_CTM, :TYP_CYLINDERS, :TYP_DOORS, :TYP_HP_FROM, :TYP_HP_UPTO, :TYP_ID, :TYP_KV_ABS_DES_ID, :TYP_KV_ASR_DES_ID, :TYP_KV_AXLE_DES_ID, :TYP_KV_BODY_DES_ID, :TYP_KV_BRAKE_SYST_DES_ID, :TYP_KV_BRAKE_TYPE_DES_ID, :TYP_KV_CATALYST_DES_ID, :TYP_KV_DRIVE_DES_ID, :TYP_KV_ENGINE_DES_ID, :TYP_KV_FUEL_DES_ID, :TYP_KV_FUEL_SUPPLY_DES_ID, :TYP_KV_MODEL_DES_ID, :TYP_KV_STEERING_DES_ID, :TYP_KV_STEERING_SIDE_DES_ID, :TYP_KV_TRANS_DES_ID, :TYP_KV_VOLTAGE_DES_ID, :TYP_KW_FROM, :TYP_KW_UPTO, :TYP_LA_CTM, :TYP_LITRES, :TYP_MAX_WEIGHT, :TYP_MMT_CDS_ID, :TYP_MOD_ID, :TYP_PCON_END, :TYP_PCON_START, :TYP_RT_EXISTS, :TYP_SORT, :TYP_TANK, :TYP_VALVES, :is_in_to
set_primary_key :TYP_ID
belongs_to :to_model
has_many :to_articles, :foreign_key => "to_type_id", :dependent => :destroy
end
class ToArticle < ActiveRecord::Base
attr_accessible :details, :manufacturer, :name, :oem_number, :only_with_vin, :quantity, :to_type_id
belongs_to :to_type, :foreign_key => "TYP_ID"
belongs_to :to_engine
end
（某些数据库是从大目录转换而来的，因此rails约定略有不完善）
我的to_type显示视图的一部分：
%td
= link_to "Подробнее", admin_catalog_to_to_article_path(c), :class=>'btn btn-primary'
= link_to "Редактирование", edit_admin_catalog_to_to_type_path(c), :class=>'btn btn-warning'
= link_to "Удалить", admin_catalog_to_to_type_path(c), :confirm => "!!!Тип #{c.Name} будет удалён!!!! Вы уверены?", :method => :delete, :class => "btn btn-danger"
我的show动作通常与我的控制器相同：
class Admin::Catalog::To::ToTypesController < ApplicationController
respond_to :html
before_filter :auth_user
def auth_user
redirect_to new_admin_session_path unless admin_signed_in?
end
def show
@mod_id = params[:id]
@man = ToType.find(:all, conditions: {:TYP_MOD_ID => @mod_id}, order: "Name ASC")
render :layout => 'admin'
end
def edit
@man = ToType.find(params[:id])
render :layout => 'admin'
end
def update
@man = ToType.find(params[:id])
if @mod.update_attributes(params[:to_type])
redirect_to admin_catalog_to_to_type_path(@man.TYP_MOD_ID)
else
render :layout => 'admin'
end
end
def new
@man = ToType.new
@mod_id = params[:mod_id]
render :layout => 'admin'
end
def create
@man = ToType.new(params[:to_type])
@mod_id = params[:mod_id]
@man.TYP_MOD_ID = @mod_id
if @man.save
redirect_to admin_catalog_to_to_type_path(@mod_id)
else
render :layout => 'admin'
end
end
def destroy
@man = ToType.find(params[:id])
if @man.destroy
redirect_to admin_catalog_to_to_type_path(@man.TYP_MOD_ID)
else
render :layout => 'admin'
end
end
end
and route:
namespace :admin do
namespace :catalog do
namespace :to do
resources :to_manufacturers,
:to_models,
:to_types,
:to_articles
end
end
end
形成部分：
= form_for [:admin, :catalog, :to, @man] do |f|
= f.label :id
...
当我尝试编辑或创建时，我得到：
undefined method `model_name' for NilClass:Class
我认为与模型连接有问题：使用update和create。在日志中我看到对象是在db中创建的，例如，在日志中我可以看到@man不为空，但我仍然得到undefined method model_name'用于NilClass：Class`。为什么呢？
更新：完整跟踪
NoMethodError in Admin/catalog/to/to_types#edit
Showing /media/sf__Projects/Denis/app/views/admin/catalog/to/to_types/_edit.html.haml where line #1 raised:
undefined method `model_name' for NilClass:Class
Extracted source (around line #1):
1: = form_for [:admin, :catalog, :to, @man] do |f|
2: = f.label :id
Trace of template inclusion: app/views/admin/catalog/to/to_types/edit.html.haml
Rails.root: /media/sf__Projects/Denis
Application Trace | Framework Trace | Full Trace
activemodel (3.2.8) lib/active_model/naming.rb:163:in `model_name_from_record_or_class'
activemodel (3.2.8) lib/active_model/naming.rb:158:in `param_key'
actionpack (3.2.8) lib/action_view/helpers/form_helper.rb:369:in `form_for'
haml (4.0.3) lib/haml/helpers/action_view_mods.rb:146:in `form_for_with_haml'
haml (4.0.3) lib/haml/helpers/action_view_xss_mods.rb:28:in `form_for_with_haml_xss'
app/views/admin/catalog/to/to_types/_edit.html.haml:1:in `_app_views_admin_catalog_to_to_types__edit_html_haml___4584370517694291299_51970960'
actionpack (3.2.8) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.8) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.8) lib/action_view/template.rb:143:in `render'
actionpack (3.2.8) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial'
actionpack (3.2.8) lib/action_view/renderer/partial_renderer.rb:238:in `block in render'
actionpack (3.2.8) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.8) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.8) lib/action_view/renderer/partial_renderer.rb:237:in `render'
actionpack (3.2.8) lib/action_view/renderer/renderer.rb:41:in `render_partial'
actionpack (3.2.8) lib/action_view/helpers/rendering_helper.rb:27:in `render'
haml (4.0.3) lib/haml/helpers/action_view_mods.rb:10:in `block in render_with_haml'
haml (4.0.3) lib/haml/helpers.rb:89:in `non_haml'
haml (4.0.3) lib/haml/helpers/action_view_mods.rb:10:in `render_with_haml'
app/views/admin/catalog/to/to_types/edit.html.haml:7:in `_app_views_admin_catalog_to_to_types_edit_html_haml___2140731807560860717_28965400'
actionpack (3.2.8) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.8) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.8) lib/action_view/template.rb:143:in `render'
actionpack (3.2.8) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
actionpack (3.2.8) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.8) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.8) lib/action_view/renderer/template_renderer.rb:46:in `block in render_template'
actionpack (3.2.8) lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout'
actionpack (3.2.8) lib/action_view/renderer/template_renderer.rb:45:in `render_template'
actionpack (3.2.8) lib/action_view/renderer/template_renderer.rb:18:in `render'
actionpack (3.2.8) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.8) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.8) lib/abstract_controller/rendering.rb:110:in `_render_template'
actionpack (3.2.8) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.8) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.8) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.8) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.8) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.8) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.8) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/pavel/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
activesupport (3.2.8) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.8) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:39:in `render'
app/controllers/admin/catalog/to/to_types_controller.rb:18:in `edit'
actionpack (3.2.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.8) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.8) lib/active_support/callbacks.rb:447:in `_run__3422493215220642812__process_action__1624115620138968240__callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.8) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.8) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.8) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.8) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.8) lib/abstract_controller/base.rb:121:in `process'
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actionpack (3.2.8) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
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Request
Parameters:
{"id"=>"28752"}
Show session dump
Show env dump
Response
Headers:
None
答案 0 :(得分：1)
你的格式是form_for [:admin, :catalog, :to, @typ]，但你没有对象@typ - 你有@man
答案 1 :(得分：1)
看起来太容易了，但@typ定义在哪里？您在控制器中部分@typ，但@man。