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PORails undefined method `model_name' in form partial
 

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  1. PORails undefined method `model_name' in form partial
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    <p>I have this model:</p> <pre><code>class ToType &lt; 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 =&gt; "to_type_id", :dependent =&gt; :destroy end class ToArticle &lt; ActiveRecord::Base attr_accessible :details, :manufacturer, :name, :oem_number, :only_with_vin, :quantity, :to_type_id belongs_to :to_type, :foreign_key =&gt; "TYP_ID" belongs_to :to_engine end </code></pre> <p>(some db is converted from big catalog, so rails conventions are slightly imperfect)</p> <p>Part of my show view of to_type: </p> <pre><code>%td = link_to "Подробнее", admin_catalog_to_to_article_path(c), :class=&gt;'btn btn-primary' = link_to "Редактирование", edit_admin_catalog_to_to_type_path(c), :class=&gt;'btn btn-warning' = link_to "Удалить", admin_catalog_to_to_type_path(c), :confirm =&gt; "!!!Тип #{c.Name} будет удалён!!!! Вы уверены?", :method =&gt; :delete, :class =&gt; "btn btn-danger" </code></pre> <p>my show action works normally same for my controller:</p> <pre><code>class Admin::Catalog::To::ToTypesController &lt; 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 =&gt; @mod_id}, order: "Name ASC") render :layout =&gt; 'admin' end def edit @man = ToType.find(params[:id]) render :layout =&gt; '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 =&gt; 'admin' end end def new @man = ToType.new @mod_id = params[:mod_id] render :layout =&gt; '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 =&gt; '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 =&gt; '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 </code></pre> <p>form partial:</p> <pre><code>= form_for [:admin, :catalog, :to, @man] do |f| = f.label :id ... </code></pre> <p>When I try edit or create I get:</p> <pre><code>undefined method `model_name' for NilClass:Class </code></pre> <p>I think that something is wrong with connection with model: with update and create. In the log I see that the object is founded in db for edit for example, and in the log I can see that @man is not empty, but I still get <code>undefined method</code>model_name' for NilClass:Class` . Why?</p> <p><strong>upd</strong>: Full trace</p> <pre><code> 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 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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 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`call' rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service' /home/pavel/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' /home/pavel/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' /home/pavel/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' Request Parameters: {"id"=&gt;"28752"} Show session dump Show env dump Response Headers: None </code></pre>
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    1. COalso i try to rename to to_engines: didn't help... I didnt understand why? (
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    2. COThe error says that you have nil when you are expecting an object. In the edit code, you don't check to see if the find() returns a record. What happens if you pass in an id that isn't present in the database?
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    3. CO@Fred but i see that from db it select data
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