gem install carrierwave and mini_magick

Gemfile

@@ -38,6 +38,10 @@ gem "bootstrap-sass"
 
 gem "simple_form"
 
+gem "carrierwave"
+
+gem "mini_magick"
+
 gem "awesome_rails_console" # 讓你的 rails console 變整齊漂亮的 gem
 
 group :development, :test do

Gemfile.lock

@@ -58,6 +58,11 @@ GEM
     builder (3.2.2)
     byebug (5.0.0)
       columnize (= 0.9.0)
+    carrierwave (0.10.0)
+      activemodel (>= 3.2.0)
+      activesupport (>= 3.2.0)
+      json (>= 1.7)
+      mime-types (>= 1.16)
     coderay (1.1.0)
     coffee-rails (4.1.0)
       coffee-script (>= 2.2.0)
@@ -98,6 +103,7 @@ GEM
       mime-types (>= 1.16, < 3)
     method_source (0.8.2)
     mime-types (2.6.1)
+    mini_magick (4.3.3)
     mini_portile (0.6.2)
     minitest (5.7.0)
     multi_json (1.11.2)
@@ -196,10 +202,12 @@ DEPENDENCIES
   awesome_rails_console
   bootstrap-sass
   byebug
+  carrierwave
   coffee-rails (~> 4.1.0)
   devise
   jbuilder (~> 2.0)
   jquery-rails
+  mini_magick
   rails (= 4.2.2)
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)