轨道4深层嵌套形式蚕茧不工作

Question

林欲借茧深深窝动态形式的Rails 4

我可是从第二级嵌套形式（_milling_datum_fields）才能上link_to_remove_association功能的错误。

错误：未定义的方法`new_record？' for nil：NilClass

对不起，大量的代码。

我的模型的关注。

项目

class Project < ActiveRecord::Base 
    belongs_to :company, inverse_of: :projects 

    has_many :project_materials 
    has_many :materials, through: :project_materials 
    has_many :finished_materials, class_name: 'Material', through: :setups 

    has_many :setups 
    has_many :milling_data, through: :setups 
    has_many :class_data, through: :setups 
    has_many :screen_data, through: :setups 

    has_many :notes, as: :notable 
    has_many :tasks, inverse_of: :project, dependent: :destroy 

    accepts_nested_attributes_for :tasks, :notes, allow_destroy: true, reject_if: :all_blank 
    accepts_nested_attributes_for :materials, :setups, :milling_data, :class_data, :screen_data, :finished_materials, reject_if: :all_blank 

设置

class Setup < ActiveRecord::Base 
    belongs_to :project 
    has_one :finished_material, class_name: "Material" 
    has_one :milling_datum 
    has_one :class_datum 
    has_one :screen_datum 

    accepts_nested_attributes_for :milling_datum, :class_datum, :screen_datum, :finished_material, reject_if: :all_blank 
end 

MillingDatum

class MillingDatum < ActiveRecord::Base 
    belongs_to :setup 
    has_many :notes, as: :notable 

我的视图

个

项目/ _form.html.erb

<%= form_for(@project) do |f| %> 
... 
<div class="col-lg-6"> 
    <%= f.fields_for :setups do |setup| %> 
     <%= render 'layouts/setup_fields', f: setup %> 
    <% end %> 
    <div class="links float-e-margins"> 
     <%= link_to_add_association 'add setup', f, :setups, partial: 'layouts/setup_fields', class: "btn btn-outline btn-default btn-xs" %> 
    </div>  
    </div> 
... 

布局/ _seutp_fields.html.erb

<div class="nested-fields"> 
... 
    <div class="col-lg-6"> 
     <%= f.fields_for :milling_data do |md| %> 
     <%= render 'layouts/milling_datum_fields', f: md %> 
     <% end %> 
     <div class="links float-e-margins"> 
     <%= link_to_add_association 'add milling data', f, :milling_data, partial: 'layouts/milling_datum_fields', class: "btn btn-outline btn-default btn-xs" %> 
     </div>  
    </div> 
    <div class="col-lg-6"> 
     <%= f.fields_for :class_data do |cd| %> 
     <%= render 'layouts/class_datum_fields', f: cd %> 
     <% end %> 
     <div class="links float-e-margins"> 
     <%= link_to_add_association 'add class data', f, :class_data, partial: 'layouts/class_datum_fields', class: "btn btn-outline btn-default btn-xs" %> 
     </div>  
    </div> 
    <div class="col-lg-6"> 
     <%= f.fields_for :screen_data do |sd| %> 
     <%= render 'layouts/screen_datum_fields', f: sd %> 
     <% end %> 
     <div class="links float-e-margins"> 
     <%= link_to_add_association 'add screen data', f, :screen_data, partial: 'layouts/screen_datum_fields', class: "btn btn-outline btn-default btn-xs" %> 
     </div>  
    </div> 
    <div class="col-lg-6"> 
     <%= f.fields_for :finished_materials do |fm| %> 
     <%= render 'material_fields', f: fm %> 
     <% end %> 
     <div class="links float-e-margins"> 
     <%= link_to_add_association 'add finished material', f, :finished_materials, partial: 'projects/material_fields', class: "btn btn-outline btn-default btn-xs" %> 
     </div>  
    </div> 
    </div> 
     <%= link_to_remove_association "X", f, class: "btn btn-outline btn-danger btn-xs pull-right" %> 

    </div> 
</div> 

布局/ _milling_datum_fields.html.erb

projects_controller强PARAMS

def project_params 
     params.require(:project).permit(:name, :scheduled_start_date, :estimated_end_date, :employees_needed, :incoming_packaging, :final_product_packaging, :sample_instructions, :project_description, :project_type, :building_id, :paid_status, :material_total_weight_lbs, :shifts, :shift_hrs, :rate_lb_hr, :company_id, 
     materials_attributes: [:id, :_destroy, :material_type, :name, :moisture, :density_g_cm3, :msds_url], 
     notes_attributes: [:id, :_destroy, :content, :notable_id, :notable_type], 
     setups_attributes: [:id, :_destroy, :project_id, 
      milling_data_attributes:[ 
      :id, :_destroy, :date_milled, :mill_model, :mill_liner_type, :mill_tlgs_set, :mill_rpm, :mill_amps, :mill_class_rpm, :mill_class_amps, :feeder_model, :feeder_speed_setting, :feeder_auger_diam_inch, :air_pressure_iw_mill_out, :air_pressure_iw_mill_in, :air_pressure_iw_dustcollector_baghouse, :air_pressure_iw_dustcollector_exit, :air_pressure_iw_blower_out, :temp_ambeint, :temp_mill_out, :temp_prod_out, :rate_test_total_lbs, :rate_test_total_time, :rate_test_lbs_hr, :setup_id 
      ], 
      screen_data_attributes:[ 
      :id, :_destroy, :screen_base_pci_id, :top_weight, :bottom_weight, :weight_lead, :deck_count, :screen_1_mesh, :screen_2_mesh, :screen_3_mesh, :setup_id 
      ], 
      class_data_attributes: [ 
      :id, :_destroy, :rate_lb_hr, :class_pci_id, :rpm, :secondary_air_setting, :ap_iw_secondary_air_in, :ap_iw_main_exit, :ap_iw_main_entrance, :setup_id 
      ], 
      finished_materials_attributes: [ 
      :id, :_destroy, :material_type, :moisture, :name, :msds_url, :density_g_cm3, :setup_id 
      ] 
     ]) 
    end 

香港专业教育学院冲刷互联网上类似的线程，但我不能弄明白。 我开始认为我的模型有问题。 如果我发布我的projects_controller.rb会有帮助吗？ 感谢您的帮助。

Answer 1

好吧伙计们我想出了我的特殊问题。

问题是我的父对象控制器（projects_controller）中定义的嵌套强参数没有根据我的模型中的关系定义正确复用。

给我的错误：错误：未定义的方法`new_record？“对零：NilClass

我

params.require(:project).permit(:name, :scheduled_start_date, :estimated_end_date, :employees_needed, :incoming_packaging, :final_product_packaging, :sample_instructions, :project_description, :project_type, :building_id, :paid_status, :material_total_weight_lbs, :shifts, :shift_hrs, :rate_lb_hr, :company_id, 
     setups_attributes: [:id, :_destroy, :project_id, 
      milling_data_attributes:[ 
      :id, :_destroy, :date_milled, :mill_model, :mill_liner_type, :mill_tlgs_set, :mill_rpm, :mill_amps, :mill_class_rpm, :mill_class_amps, :feeder_model, :feeder_speed_setting, :feeder_auger_diam_inch, :air_pressure_iw_mill_out, :air_pressure_iw_mill_in, :air_pressure_iw_dustcollector_baghouse, :air_pressure_iw_dustcollector_exit, :air_pressure_iw_blower_out, :temp_ambeint, :temp_mill_out, :temp_prod_out, :rate_test_total_lbs, :rate_test_total_time, :rate_test_lbs_hr, :setup_id 
      ]) 

因为我的关系去Project has_many->Setups has_one->Milling_datum我需要的milling_data_attributes的多元化更改为milling_datum_attributes

从寻找到这个问题，我已经看到了最常见的错误Coccoon宝石

1. 包含嵌套的强参数和正确的多元化e根据模型中定义的关系来确定一个对象。

2. 根据模型中定义的关系，让您的父模型根据每个对象的正确复数定义正确的acceptenesnes_attributes_for。

3. 使用partials，html和coccoon的正确结构根据cocoon指令提供函数。