在lib文件夹中使用Ruby对象时出现未初始化的常量错误

问题描述

我有一个相当复杂的表单的应用程序，它在lib文件夹中使用Ruby对象（我第一次使用ruby对象）。我不断收到像这样的未初始化的常量错误：

 未初始化的常量ProjectsController :: ProjectUpdater 
  

我的表单试图做的是创建初始任务&基于预先制定的模板任务和里程碑的入门级里程碑。所以当用户创建一个项目时，他们已经添加了一些常见的任务。这个代码直接涉及这个前面的问题&

我的控制器： ApplicationController

def new_milestones
@ project.milestones.build
@ project.tasks.build
@milestones_templates = MilestoneTemplate.where（template_id：@project.template_id）
结束

def更新
respond_to do | format |
** result = ProjectUpdater.perform（@project，update_params）== true **< - 错误在这一行
if result == true
format.html {redirect_to }项目已成功更新。}
format.json {render：show，status：：ok，location：@project}
else
@project = result
format.html {render：edit}
format.json {render json：@project.errors，status：：unprocessable_entity}
end
end
end

def project_params
params.require（：project）.permit（：id，：name，：template_id，milestone_attributes：[{：names => []}，{：ids => [] }，{：milestone_ids => []}，：id，：name，：project_id，：milestone_template_id，：project_id，task_attributes：[{：names => []}，{：ids => [] {：task_ids => []}，：id，：name，：milestone_id，：task_template_id，：project_id，：_destroy]]）
结束
结束

/ projec t_updater.rb

  class ProjectUpdater 
 
 def self.perform（project，params）
 milestones = params [：project] [：milestones] 
＃创建并保存每个里程碑
＃您可以使用嵌套属性来保存任务。 
 
如果project.update_attributes（params [：project]）
返回true 
 else 
返回项目
结束
结束
结束
  

我的表格

 <％= form_for @project do | f | ％GT; 
 < br> 
 <％= fm.hidden_​​field：name，value：milestone.name％> 
 <％= fm.label milestone.name％> 
<％= fm.check_box：milestone_template_id，{}，milestone.id％> 
< br> 
   <％= ft.label task.name％> 
<％= ft.check_box：task_ids，{}，task.id％> 
<％end％> 
<％end％> 
< br> 
<％end％> 
<％end％> 
< br> 
<％= f.submit％> 
<％end％> 
  

解决方案

我认为您需要在 / lib 目录，并确保你遵循命名约定..就像

 ＃在lib / foo.rb中：
 class Foo 
 end 
 $ b $在lib / foo / bar.rb中：$ b $ class Foo :: Bar 
结束
 
＃在你的情况下，在lib / project_updater.rb 
 class ProjectUpdater 
 def self.perform（your_params ,,,）
＃你的代码
 end 
 end 
  

在config / application.rb中：

  config.autoload_paths<< ％W（＃{config.root} / lib）
  

这可能对你有帮助， / p>

I have an app with a fairly complicated form that uses Ruby Objects in the lib folder (my first time with ruby objects). I keep getting an uninitialized constant error like this: Add Multiple Nested Attributes through checkboxes Rails 4 (maybe with multiple forms)

uninitialized constant ProjectsController::ProjectUpdater

What my form is trying to do is create starter tasks & starter milestones based on premade "template" tasks and milestones. So when a user creates a Project, they have some common tasks already added. This code relates directly to this previous question & answer:

my controller:

class ProjectsController < ApplicationController

def new_milestones
    @project.milestones.build
    @project.tasks.build
    @milestones_templates = MilestoneTemplate.where(template_id: @project.template_id)
  end

 def update
    respond_to do |format|
      **result = ProjectUpdater.perform(@project, update_params) == true** <-- the error is on this line
      if result == true
        format.html { redirect_to @project, notice: 'Project was successfully updated.' }
        format.json { render :show, status: :ok, location: @project }
      else
        @project = result
        format.html { render :edit }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end

  def project_params
      params.require(:project).permit(:id, :name, :template_id, milestone_attributes:[{:names => []},  {:ids => []}, { :milestone_ids => []},:id, :name, :project_id, :milestone_template_id, :project_id, task_attributes: [{:names => []},  {:ids => []}, { :task_ids => []}, :id, :name, :milestone_id, :task_template_id, :project_id, :_destroy]])
    end
  end

lib/project_updater.rb

class ProjectUpdater

  def self.perform(project, params)
    milestones = params[:project][:milestones]
    #Create and save each milestone
    # You might be able to us nested attributes to save tasks.

    if project.update_attributes(params[:project])
      return true
    else
      return project
    end
  end
end

my form

<%= form_for @project do |f| %>
  <% @milestones_templates.each_with_index do |milestone, index| %>
    <br>
    <%= f.fields_for :milestones, index: index do |fm| %>
      <%= fm.hidden_field :name, value: milestone.name %>
      <!-- Create a checkbox to add the milestone_id to the project -->
      <%= fm.label milestone.name %>
      <%= fm.check_box :milestone_template_id,{}, milestone.id %>
      <br>
      <% milestone.task_templates.each_with_index do |task, another_index| %>
        <%= fm.fields_for :tasks, index: another_index do |ft| %>
          <!-- Create a checkbox for each task in the milestone -->
          <%= ft.label task.name %>
          <%= ft.check_box :task_ids, {}, task.id %>
        <% end %>
      <% end %>
      <br>
    <% end %>
  <% end %>
  <br>
<%= f.submit %>
  <% end %>

解决方案

I think you need to require the ruby files in the /lib directory and make sure you follow the naming convention.. like

        # in lib/foo.rb:
        class Foo
        end

        # in lib/foo/bar.rb:
        class Foo::Bar
        end

    # in you case, in lib/project_updater.rb
    class ProjectUpdater
      def self.perform (your_params,,,)
        # your code
      end
    end

in config/application.rb:

config.autoload_paths << %W(#{config.root}/lib)

This may help you, prehaps :)

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