fix issue #238 + File.exists? -> File.exist?

Gemfile.lock

@@ -5,7 +5,7 @@ PATH
       RedCloth (~> 4.3.2)
       bcrypt (~> 3.1.11)
       chronic (~> 0.10.2)
-      dragonfly (>= 1.2, < 1.5)
+      dragonfly (~> 1.4.0)
       duktape (~> 2.0.1.1)
       execjs (~> 2.9.1)
       httparty (~> 0.21.0)

lib/locomotive/steam/initializers/dragonfly.rb

@@ -1,12 +1,12 @@
+require 'dragonfly'
+
 module Locomotive
   module Steam
     module Initializers
 
       class Dragonfly
 
         def run
-          require 'dragonfly'
-
           # need to be called outside of the configure method
           imagemagick_commands = find_imagemagick_commands
 
@@ -15,6 +15,10 @@ def run
               plugin :imagemagick, imagemagick_commands
             end
 
+            processor :convert do |content, args|
+              ::Dragonfly::ImageMagick::Commands.convert(content, args)
+            end
+
             verify_urls true
 
             secret Locomotive::Steam.configuration.image_resizer_secret

lib/locomotive/steam/services/image_resizer_service.rb

@@ -5,13 +5,13 @@ class ImageResizerService
 
       attr_accessor_initialize :resizer, :asset_path
 
-      def resize(source, geometry, convert = "")
+      def resize(source, geometry, convert_args = "")
         return get_url_or_path(source) if disabled? || geometry.blank?
 
         if file = fetch_file(source)
-          transformed_file = file.thumb(geometry)
-          transformed_file = transformed_file.convert(convert) if !convert.blank?
-          transformed_file.url
+          job = file.thumb(geometry)
+          job = image_magick_convert(job, convert_args)
+          job.url
         else
           Locomotive::Common::Logger.error "Unable to resize on the fly: #{source.inspect}"
           nil
@@ -47,6 +47,11 @@ def get_url_or_path(source)
         value.strip if value
       end
 
+      def image_magick_convert(job, options = '')
+        return job if options.blank?
+        job.process(:convert, options)
+      end
+
     end
 
   end

locomotivecms_steam.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'rack-cache',             '>= 1.7', '< 2'
   spec.add_dependency 'rack-session',           '~> 2.0.0'
   spec.add_dependency 'rack_csrf',              '~> 2.6.0'
-  spec.add_dependency 'dragonfly',              '>= 1.2', '< 1.5'
+  spec.add_dependency 'dragonfly',              '~> 1.4.0'
   spec.add_dependency 'moneta',                 '~> 1.6.0'
 
   spec.add_dependency 'execjs',                 '~> 2.9.1'