未定义的方法`update_all'为零：NilClass

Question

我试图通过复选框实现更新我的条目的方式，以便通过复选框可以清除选定的条目，并将完成的条目显示在单独的视图上。我通过复选框跟踪了更新条目的railscast，但是我收到了上面的错误，我似乎无法解决它。

控制器：

class Admin::DiagnosticsController < Admin::BaseController 
    before_filter :diagnostic, :except => [:index, :complete] 

    def index 
    @diagnostics = DiagnosticInfo.all.order_by(:created_at.desc).page(params[:page]).per(50) 
    end 

    def show 
    respond_to do |format| 
     format.html 
     format.json { render json: @diagnostic } 
    end 
    end 

    def update 
    if @diagnostic.update_attributes(params[:diagnostic_info]) 
     redirect_to admin_diagnostic_path, notice: 'Successfully updated.' 
    else 
     render action: "edit" 
    end 
    end 

    def edit 
    end 

    def destroy 
    diagnostic.destroy 
    redirect_to admin_diagnostics_path 
    end 

    def complete 
    @diagnostic.update_all(["completed_at=?", Time.now], :id => params[:diagnostics_ids]) 
    end 


private 

    def diagnostic 
    @diagnostic = DiagnosticInfo.find(params[:id]) 
    end 
end 

查看：

%h1 Diagnostics 
= form_tag complete_admin_diagnostics_path, :method => :put 
/- for diagnostic in @diagnostics do 

%table 
    %tr 
    %th 
    %th User 
    %th Message 
    %th Device 
    %th RELS-Mobile Version 
    %th Submitted 
    %th Archive 
    - @diagnostics.each do |diagnostic| 
    %tr 
     %td 
     %strong= link_to 'show', admin_diagnostic_path(diagnostic) 
     %td 
     - if diagnostic.user 
      = link_to diagnostic.user.email, [:admin, diagnostic.user] 
     - else 
      unknown 
     %td 
     = diagnostic.data["message"] 
     %td 
     %pre= JSON.pretty_generate(diagnostic.data["device"]) 
     %td 
     = diagnostic.data["appVersion"] 
     %td 
     = diagnostic.updated_at 
     %td 
     = check_box_tag "diagnostic_ids[]", diagnostic.id 
     = diagnostic.data 

    = submit_tag "Mark as complete" 
= paginate @diagnostics 

Answer 1

您应该使用

Diagnostic.where(params[:diagnostics_ids]).update_all(completed_at: Time.now)