fix image rake script

lib/tasks/images.rake

@@ -1,7 +1,7 @@
 namespace :images do
   desc "Generate medium-sized images of posts"
   task :generate_medium => :environment do
-    Post.where("width > ?", Danbooru.config.medium_image_width).find_each do |post|
+    Post.where("image_width > ?", Danbooru.config.medium_image_width).find_each do |post|
       if post.is_image?
         puts "resizing medium #{post.id}"
         Danbooru.resize(post.file_path, post.medium_file_path, Danbooru.config.medium_image_width, nil, 90)
@@ -11,7 +11,7 @@ namespace :images do
 
   desc "Generate large-sized images of posts"
   task :generate_large => :environment do
-    Post.where("width > ?", Danbooru.config.large_image_width).find_each do |post|
+    Post.where("image_width > ?", Danbooru.config.large_image_width).find_each do |post|
       if post.is_image?
         puts "resizing large #{post.id}"
         Danbooru.resize(post.file_path, post.large_file_path, Danbooru.config.large_image_width, nil, 90)
@@ -21,7 +21,7 @@ namespace :images do
   
   desc "Distribute medium posts to other servers"
   task :distribute_medium => :environment do
-    Post.where("width > ?", Danbooru.config.medium_image_width).find_each do |post|
+    Post.where("image_width > ?", Danbooru.config.medium_image_width).find_each do |post|
       if post.is_image?
         puts "distributing medium #{post.id}"
         RemoteFileManager.new(post.medium_file_path).distribute
@@ -31,7 +31,7 @@ namespace :images do
 
   desc "Distribute large posts to other servers"
   task :distribute_large => :environment do
-    Post.where("width > ?", Danbooru.config.large_image_width).find_each do |post|
+    Post.where("image_width > ?", Danbooru.config.large_image_width).find_each do |post|
       if post.is_image?
         puts "distributing large #{post.id}"
         RemoteFileManager.new(post.large_file_path).distribute