[英]How to upload a file in ruby on rails?
I'm very new in ruby on rails. 我在铁轨上的红宝石很新。 I'm stuck with a problem. 我遇到了问题。 I want to make a file upload functionality through which I can upload any kind of file (text,image etc.). 我想创建一个文件上传功能,通过它我可以上传任何类型的文件(文本,图像等)。 My controller file is (upload_controller.rb): 我的控制器文件是(upload_controller.rb):
class UploadController < ApplicationController
def index
render :file => 'app\views\upload\uploadfile.html.erb'
end
def uploadFile
post = DataFile.save(params[:upload])
render :text => "File has been uploaded successfully"
end
end
My Model file is (data_file.rb): 我的模型文件是(data_file.rb):
class DataFile < ActiveRecord::Base
attr_accessor :upload
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, "wp") { |f| f.write(upload['datafile'].read)}
end
end
My View file is (uploadfile.html.erb): 我的View文件是(uploadfile.html.erb):
<h1>File Upload</h1>
<%= form_tag({:action => 'uploadFile'}, :multipart => true) do %>
<p><label for="upload_file">Select File</label>
<%= file_field 'upload', 'datafile' %></p>
<%= submit_tag "Upload" %>
<% end %>
Now when I try to upload image then I'm getting error "invalid access mode wp" in model file. 现在,当我尝试上传图像时,我在模型文件中收到错误“无效访问模式wp”。 When I change File.open(path, "wp") to File.open(path, "w") in model file this give error "'\\x89' from ASCII-8BIT to UTF-8". 当我在模型文件中将File.open(path,“wp”)更改为File.open(path,“w”)时,这会将“'\\ x89'从ASCII-8BIT更改为UTF-8”。 For .txt file, It works fine. 对于.txt文件,它工作正常。 I'm using ruby 1.9.3 and rails 3.2.6 我正在使用ruby 1.9.3和rails 3.2.6
Thank you for example, I study rails too! 谢谢你,我也研究过rails!
It works in rails 3.1 它适用于rails 3.1
My code: 我的代码:
Routes
resources :images do
collection { post :upload_image }
end
Controller 调节器
class ImagesController < ApplicationController
def index
@car = Car.find(params[:car_id])
@images = @car.images.order("order_id")
end
def upload_image
DataFile.save_file(params[:upload])
redirect_to images_path(:car_id => params[:car_id])
end
View index.html.erb 查看index.html.erb
<h1>File Upload</h1>
<%= form_tag({:action => 'upload_image', :car_id => @car.id}, :multipart => true) do %>
<p><label for="upload_file">Select File</label>
<%= file_field 'upload', 'datafile' %></p>
<%= submit_tag "Upload" %>
<% end %>
<% @images.each do |image| %>
<%= image.id %><br/>
<%= image.name %>
<% end %>
Model 模型
class DataFile < ActiveRecord::Base
attr_accessor :upload
def self.save_file(upload)
file_name = upload['datafile'].original_filename if (upload['datafile'] !='')
file = upload['datafile'].read
file_type = file_name.split('.').last
new_name_file = Time.now.to_i
name_folder = new_name_file
new_file_name_with_type = "#{new_name_file}." + file_type
image_root = "#{RAILS_CAR_IMAGES}"
Dir.mkdir(image_root + "#{name_folder}");
File.open(image_root + "#{name_folder}/" + new_file_name_with_type, "wb") do |f|
f.write(file)
end
end
end
The reason for the issue is encoding problems. 问题的原因是编码问题。 It seems that you are reading the file in ASCII-8BIT mode and writing it in UTF-8 which means a conversion needs to take place. 您似乎正在以ASCII-8BIT模式读取文件并以UTF-8编写,这意味着需要进行转换。 And conversion from ASCII-8BIT to UTF-8 isn't straight forward. 从ASCII-8BIT到UTF-8的转换并不是直截了当的。 Alternatively, you can specify binary mode for both reading and writing the files. 或者,您可以为读取和写入文件指定二进制模式。
upload_file = File.new(<original file>, "rb").read
and 和
File.open(<final uploaded file>, "wb") {|f| f.write(upload_file) }
Another great option would be carrierwave , which is very simple to install and the guide on github can have you up and running in a matter of minutes. 另一个很好的选择是carrierwave ,安装非常简单,github上的指南可以在几分钟内启动并运行。 Add it to your gemfile then run bundle install
将它添加到您的gemfile然后运行bundle install
There's also a good railscast on the subject 关于这个问题,还有一个很好的轨道广播
use "wb" instead of "wp". 用“wb”代替“wp”。 it works 有用
File.open(path, "wb") { |f| f.write(upload['datafile'].read)}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.