Question

有人可以回答如何使用ROR解决以下错误吗？

错误：

NoMethodError in ImagesController#uploadFile
undefined method `[]' for #<ActionDispatch::Http::UploadedFile:0x37973b8>

Extracted source (around line #0):

我的代码片段如下所示。

视图/图像/ index.html.erb

<h1>File Upload</h1>
<%= form_for @image,:url => {:action => 'uploadFile'},
                    :multipart => true do |f| %>
<p><label for="upload_file">Select File</label> :
  <%= f.file_field :datafile %></p>
<%= f.submit "Upload" %>
<% end %>

控制器/ images_controller.rb

class ImagesController < ApplicationController
  def index
    @image=Image.new
  end
  def uploadFile
    post = Image.save(params[:image][:datafile])
    render :text => "File has been uploaded successfully"
  end
end

模型/ image.rb

class Image < ActiveRecord::Base
  def self.save(upload)
    name =  upload['datafile'].original_filename
    directory = "public/data"
    # create the file path
    path = File.join(directory, name)
    # write the file
    File.open(path, "wb") { |f| f.write(upload['datafile'].read) }
  end
end

迁移\ 20150115060041_create_images.rb

class CreateImages < ActiveRecord::Migration
  def change
    create_table :images do |t|
      t.string :datafile

      t.timestamps null: false
    end
  end
end

请帮我解决上述错误。谢谢。

Answer 1

拳头，你在控制器中调用这样的保存方法

post = Image.save(params[:image][:datafile])

然后在Image Model里面。 U R再次尝试访问[datafile]，因为你传递的对象已经是datafile，因此你得到了错误。

在图像模型中更改此内容

upload['datafile']

至

upload

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