Uploading File into Server and store the path in database in Ruby on Rails

Question

I am very new to ROR. I have a task to finish:

Here's the Model:

class File::DataImport < ActiveRecord::Base
  attr_accessible :created_by, :file_name, :file_source, :updated_at, :updated_by
end

Here's the Controller:

class Files::DataImportsController < ApplicationController
  def index
  end

  def new
  end
end

And the views I have are index and new.

I want a field to upload data. The data should be stored in the server and save the filepath into the database in a specified column file_name. The path should be default to all uploading files.

I am stuck with how to start. Please help me to find the solution and I will learn from this.

Thanks in advance.

Claud Kho · Accepted Answer · 2012-09-19 07:17:04Z

9

db/migrate/20110711000004_create_files.rb

class CreateFiles < ActiveRecord::Migration
def change
  create_table :files do |t|
  t.string :name
  # If using MySQL, blobs default to 64k, so we have to give
  # an explicit size to extend them
  t.binary :data, :limit => 1.megabyte
  end
end
end

app/controllers/upload_controller.rb

 class UploadController < ApplicationController
 def get
 @file = File.new
 end
 end

app/views/upload/get.html.erb

<% form_for(:file,
url: {action: 'save'},
html: {multipart: true}) do |form| %>
Upload your file: <%= form.file_field("uploaded_file") %><br/>
<%= submit_tag("Upload file") %>
<% end %>

app/models/file.rb

class File < ActiveRecord::Base
def uploaded_file=(file_field)
self.name = base_part_of(file_field.original_filename)
self.data = file_field.read
end
def base_part_of(file_name)
File.basename(file_name).gsub(/[^\w._-]/, '')
end
end

app/controllers/upload_controller.rb

def save
@file = File.new(params[:file])
if @file.save
redirect_to(action: 'show', id: @file.id)
else
render(action: :get)
end
end

app/controllers/upload_controller.rb

def file
@file = File.find(params[:id])
send_data(@File.data,
filename: @File.name,
disposition: "inline")
end

app/controllers/upload_controller.rb

def show
@file = File.find(params[:id])
end

app/views/upload/show.html.erb

<h3><%= @file.name %></h3>
<img src="<%= url_for(:action => 'file', :id => @file.id) %>"/>

answered Sep 19, 2012 at 7:17

Claud Kho

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1 Comment

MrSolarius Over a year ago

I have tried your solution 9year later and I have this error: Unpermitted parameter: :uploaded_file if you are still alive could you help me?

tmaximini · Accepted Answer · 2012-09-18 21:00:01Z

1

you should consider using one of the already available solutions like paperclip: https://github.com/thoughtbot/paperclip or carrierwave: https://github.com/jnicklas/carrierwave

Besides the Readmes there are also good tutorials out there:

http://railscasts.com/episodes/134-paperclip

http://railscasts.com/episodes/253-carrierwave-file-uploads

edit: As you want to implement it yourself I recommend examining the sources of the above on Github and try to understand what their code is doing. Also I would not bother implementing it myself, but if you have your reasons this might get you going..

answered Sep 18, 2012 at 21:00

tmaximini

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1 Comment

Sri Over a year ago

Hello frank, Thanks for your reply. But I should not use any gem or plugins for this. Thanks

Zajn · Accepted Answer · 2012-09-18 20:59:02Z

0

You might want to look into a solution such as carrierwave.

The Github page provides a good explanation on how to use it, but this is also a nice guide.

answered Sep 18, 2012 at 20:59

Zajn

4,10826 silver badges39 bronze badges

3 Comments

Sri Over a year ago

Hi Zajn, Thanks and the problem is that i should not use any gem or any plugin's.

Zajn Over a year ago

What is restricting you from using a gem? It's probably better to not try and reinvent the wheel here, unless you have a really good reason to do so.

Sri Over a year ago

This is like a Test. So I should learn from this.... That's why i should not use any gem or any plugin's.

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