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  • Implementing file upload functionality with PapaerClip Gem

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    Uploading a file in rails through Paperclip

    As we know these days almost all the applications have the requirement to upload files to the application then be it an image , a video or any other file. I am writing this blog to share with you all a simple way of uploading an image file to your application. For that we will use Paperclip gem.

    The steps are as fallows:

    Step 1 : Go to your gemfile and add the paper clip gem to it.

    gem "paperclip", "~> 3.0"

    Then run command bundle install in your console.

    Step 2 : Now create a model in which you have to store your attachment giving the name of the column as 'attached_file' and its data type as 'attachment'. let the model be Users. Now your user.rb file should look like thiis.

    class User < ActiveRecord::Base
      has_attached_file :attached_file
    end

    And your migration file that is 20160511110347_create_user.rb should look like this 

    class CreateUsers < ActiveRecord::Migration
      def change
        create_table :users do |t|
          t.attachment :attached_file
          t.timestamps
        end
      end
    end
    

    Step 3 : Creating the controller to get your file permitted and saved in the model. The create method will get the attached file in the params save it to the database through the model. Now your users_controller.rb file should look like this.

    class UsersController < ApplicationController
    
      def index
        @users = User.all
      end
    
      def new
        @user = User.new
      end
    
      def create
        @user = User.new(user_params)
    
        if @user.save
          redirect_to action_path
        else
          render 'new' 
        end
      end
    
      private
        def user_params
          params.require(:user).permit(:attached_file)
        end
    end

    Step 4 :  Now finally creating the view of your application through which you will let the user to upload a file. Your new.html.erb fin the views/user folder should look like this.

    <%= form_for :user , url: users_path do |f| %>
      <div class="field">
        <%= f.label :attached_file %><br>
        <%= f.file_field :attached_file %>
      </div>
    <% end %>

    And there you go. Now you have successfully uploaded a file to your database.

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