NoMethodError（未定義的方法`項目的零：NilClass）：

NoMethodError（未定義的方法projects' for nil:NilClass): app/controllers/project_controller.rb:8:in索引」NoMethodError（未定義的方法`項目的零：NilClass）：

Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.3/lib/action_dispatch/middleware/templates/rescues/_source.erb 
(21.7ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.3/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (5.2ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.3/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb 
(3.6ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb 
within rescues/layout (89.7ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_markup.html.erb 
(0.6ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_inner_console_markup.html.erb 
within layouts/inlined_string (0.6ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/_prompt_box_markup.html.erb 
within layouts/inlined_string (0.7ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/style.css.erb 
within layouts/inlined_string (0.5ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/console.js.erb within layouts/javascript (51.7ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/main.js.erb 
within layouts/javascript (1.2ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.9ms) Rendered 
/Users/ajaysithagari/.rvm/gems/ruby-2.2.1/gems/web-console-2.2.1/lib/web_console/templates/index.html.erb (116.8ms)

這裏是一個項目的控制器：

class ProjectController < ApplicationController 

    before_action :confirm_logged_in 

    before_action :find_company 


    def index 

    @projects = @company.projects.sorted 
    end 

    def show 

    @project = Project.find(params[:id]) 
    end 

    def new 

    @project = Project.new() 
    @project_count = Project.count + 1 
    @companys = Company.order("position ASC") 
    end 

    def create 

    @project = Project.new(project_params) 
    if @project.save 
     redirect_to(:action => 'index') 
    else 

     @project_count = Project.count + 1 
     @companys = Company.order("position ASC") 
     render('new') 
    end 
    end 

    def edit 

    @project = Project.find(params[:id]) 
    @project_count = Project.count 
    @companys = Company.order("position ASC") 
    end 

    def update 

    @project = Project.find(params[:id]) 
    if @project.update_attributes(project_params) 
     redirect_to(:action => 'index') 
    else 

     @project_count = Project.count 
     @companys = Company.order("position ASC") 
     render('new') 
    end 
    end 

    def delete 

    @project = Project.find(params[:id]) 
    end 

    def destory 

    @project = Project.find(params[:id]) 
    @project.destroy 
    redirect_to(:action => 'index') 
    end 


    private 

    def project_params 

    params.require(:project).permit(:name, :position, :type_of_project, :description, :no_of_tasks) 
    end 

    def find_company 

    if params[:company_id] 
     @company = Company.find(params[:company_id]) 
    end 
    end 
end

來源

2015-11-25 user5575586

誤差裝置@company是nil。該公司是從方法find_company，您可以糾正您的find_company邏輯或pro請在您的請求中提供company_id參數。您還可以調整index方法來獲取所有的項目，如果@company是零，像這樣：

def index 
    @projects = Project.all.sorted 
end

這一切都取決於你想如何加載的項目。

來源

2015-11-25 00:42:01 nayiaw

什麼是您的鏈接網址或按鈕網址去索引頁。您需要通過:company_id params才能使其工作。

例如

projects_path(:company_id => Company.first.id)

來源

2015-11-25 00:47:55

NoMethodError（未定義的方法`項目的零：NilClass）：

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