def accepts_attachments_for(collection_name, collection_class:, accessor_prefix:, attachment: :file, append: false)
      include MultipleAttachments.new(
        collection_name,
        collection_class: collection_class,
        name: accessor_prefix,
        attachment: attachment,
        append: append
      )
    end
def accepts_attachments_for(collection_name, collection_class:, accessor_prefix:, attachment: :file, append: false)
      include MultipleAttachments.new(
        collection_name,
        collection_class: collection_class,
        name: accessor_prefix,
        attachment: attachment,
        append: append
      )
    end
Macro which generates accessors in pure Ruby classes for assigning
 multiple attachments at once. This is primarily useful together with
 multiple file uploads. There is also an Active Record version of
 this macro.

 The name of the generated accessors will be the name of the association
 (represented by an attribute accessor) and the name of the attachment in
 the associated class. So if a `Post` accepts attachments for `images`, and
 the attachment in the `Image` class is named `file`, then the accessors will
 be named `images_files`.

 @example in associated class
   class Document
     extend Refile::Attachment
     attr_accessor :file_id

     attachment :file

     def initialize(attributes = {})
       self.file = attributes[:file]
     end
   end

 @example in class
   class Post
     extend Refile::Attachment
     include ActiveModel::Model

     attr_accessor :documents

     accepts_attachments_for :documents, accessor_prefix: 'documents_files', collection_class: Document

     def initialize(attributes = {})
       @documents = attributes[:documents] || []
     end
   end

 @example in form
   <%= form_for @post do |form| %>
     <%= form.attachment_field :documents_files, multiple: true %>
   <% end %>

 @param [Symbol]  collection_name      Name of the association
 @param [Class]   collection_class     Associated class
 @param [String]  accessor_prefix      Name of the generated accessors
 @param [Symbol]  attachment           Name of the attachment in the associated class
 @param [Boolean] append               If true, new files are appended instead of replacing the entire list of associated classes.
 @return [void]