Image handling by carrierwave instead of using paperclip

Gemfile

@@ -30,8 +30,10 @@ gem 'jbuilder', '~> 2.5'
 # Use ActiveModel has_secure_password
 # gem 'bcrypt', '~> 3.1.7'
 
-# Paperclip is intended as an easy file attachment library for ActiveRecord
-gem "paperclip", "~> 5.0.0"
+# Provides a simple and extremely flexible way to upload files from Ruby applications
+gem 'carrierwave', '~> 1.0'
+# A ruby wrapper for ImageMagick or GraphicsMagick command line.
+gem 'mini_magick'
 # bootstrap-sass is a Sass-powered version of Bootstrap 3
 gem 'bootstrap-sass', '~> 3.3.6'
 # Vacuum is a fast, light-weight Ruby wrapper to the Amazon Product Advertising API

Gemfile.lock

@@ -56,11 +56,12 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
+    carrierwave (1.1.0)
+      activemodel (>= 4.0.0)
+      activesupport (>= 4.0.0)
+      mime-types (>= 1.16)
     childprocess (0.7.0)
       ffi (~> 1.0, >= 1.0.11)
-    climate_control (0.2.0)
-    cocaine (0.5.8)
-      climate_control (>= 0.0.3, < 1.0)
     coffee-rails (4.2.2)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0)
@@ -93,7 +94,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mini_magick (4.5.1)
     mini_portile2 (2.2.0)
     minitest (5.10.2)
     multi_json (1.12.1)
@@ -102,12 +103,6 @@ GEM
     nio4r (2.1.0)
     nokogiri (1.8.0)
       mini_portile2 (~> 2.2.0)
-    paperclip (5.0.0)
-      activemodel (>= 4.2.0)
-      activesupport (>= 4.2.0)
-      cocaine (~> 0.5.5)
-      mime-types
-      mimemagic (~> 0.3.0)
     public_suffix (2.0.5)
     puma (3.9.1)
     rack (2.0.3)
@@ -197,11 +192,12 @@ DEPENDENCIES
   bootstrap-sass (~> 3.3.6)
   byebug
   capybara (~> 2.13)
+  carrierwave (~> 1.0)
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
+  mini_magick
   mysql2 (>= 0.3.18, < 0.5)
-  paperclip (~> 5.0.0)
   puma (~> 3.7)
   rails (~> 5.1.1)
   sass-rails (~> 5.0)

db/migrate/20170606064132_add_image_columns_to_products.rb

 class AddImageColumnsToProducts < ActiveRecord::Migration[5.1]
-  def up
-    add_attachment :products, :image
-  end
-
-  def down
-    remove_attachment :products, :image
+  def change
+    add_column :products, :image_url, :string
   end
 end