在实例化类时，Rails未初始化为常量

I have created a new class in my Rails application under a folder structure of app/datatables

我在app / datatables的文件夹结构下的Rails应用程序中创建了一个新类

The class is saved in a file in this directory and it is saved as DatasetIndexDatatable.rb

该类保存在此目录的文件中，并保存为DatasetIndexDatatable.rb

The contents of the class file is as follows:

类文件的内容如下：

class DatasetIndexDatatable
  delegate :params, :h, :link_to, :number_to_currency, to: :@view

  def initialize(view)
    @view = view
  end

end

When I try to instantiate this class from a controller in my application, Rails gives an error:

当我尝试从我的应用程序中的控制器实例化此类时，Rails给出错误：

uninitialized constant DatadescriptionController::DatasetIndexDatatable

The code in the controller which attempts to instantiate the new class is as follows:

控制器中尝试实例化新类的代码如下：

class DatadescriptionController < ApplicationController
  layout "datadescription"

  def index
respond_to do |format|
        format.html
        format.json { render json: DatasetIndexDatatable.new(view_context) }
    end
  end

end

Why can't Rails see the new class? I have tried adding the folder containing the class to the config.autoload_paths variable in application.rb:

为什么Rails不能看到新类？我尝试将包含该类的文件夹添加到application.rb中的config.autoload_paths变量中：

config.autoload_paths += %W(#{config.root}/lib
                            #{config.root}/datatables)

but the same error occurs. I have also tried instantiating the new class in the controller using the global namespace:

但是会发生同样的错误。我还尝试使用全局命名空间在控制器中实例化新类：

format.json { render json: ::DatasetIndexDatatable.new(view_context) }

and using the containing folder for the class as a namespace:

并使用类的包含文件夹作为命名空间：

format.json { render json: Datatables::DatasetIndexDatatable.new(view_context) }

all to no avail. What am I doing wrong?

一切都无济于事。我究竟做错了什么？

1 个解决方案

#1

The file is named incorrectly. Instead of:

该文件名称不正确。代替：

DatasetIndexDatatable.rb

Call it:

叫它：

dataset_index_datatable.rb

This is a Rails standard naming convention. If you define a CamelCase class, the file that contains the definition should be named camel_case.rb which is lower case with underscores.

这是Rails标准命名约定。如果定义了CamelCase类，则包含该定义的文件应命名为camel_case.rb，它是带下划线的小写。

#1