Added option to customize the validation error messages

lib/paperclip.rb

@@ -147,6 +147,7 @@ module Paperclip
     # * +in+: a Range of bytes (i.e. +1..1.megabyte+),
     # * +less_than+: equivalent to :in => 0..options[:less_than]
     # * +greater_than+: equivalent to :in => options[:greater_than]..Infinity
+    # * +message+: error message to display, use #{min} and #{max} as replacements
     def validates_attachment_size name, options = {}
       attachment_definitions[name][:validations] << lambda do |attachment, instance|
         unless options[:greater_than].nil?
@@ -156,16 +157,23 @@ module Paperclip
           options[:in] = (0..options[:less_than])
         end
         unless options[:in].include? instance[:"#{name}_file_size"].to_i
-          "file size is not between #{options[:in].first} and #{options[:in].last} bytes."
+          min = options[:in].first
+          max = options[:in].last
+          
+          if options[:message]
+            eval('"' + options[:message] + '"')
+          else
+            "file size is not between #{min} and #{max} bytes."
+          end
         end
       end
     end
 
     # Places ActiveRecord-style validations on the presence of a file.
-    def validates_attachment_presence name
+    def validates_attachment_presence name, options = {}
       attachment_definitions[name][:validations] << lambda do |attachment, instance|
         if attachment.original_filename.blank?
-          "must be set."
+          options[:message] || "must be set."
         end
       end
     end

test/test_paperclip.rb

@@ -64,11 +64,14 @@ class PaperclipTest < Test::Unit::TestCase
       assert Dummy.new.respond_to?(:avatar=)
     end
 
-    [[:presence,   nil,                                "5k.png", nil],
-     [:size,       {:in => 1..10240},                  "5k.png", "12k.png"],
-     [:content_type1,{:content_type => "image/png"},   "5k.png", "text.txt"],
-     [:content_type2, {:content_type => :image},       "5k.png", "text.txt"],
-     [:content_type3, {:content_type => "text/plain"}, "text.txt", "5k.png"]].each do |args|
+    [[:presence,   nil,                                    "5k.png", nil],
+     [:size,       {:in => 1..10240},                      "5k.png", "12k.png"],
+     [:content_type1,{:content_type => "image/png"},       "5k.png", "text.txt"],
+     [:content_type2, {:content_type => :image},           "5k.png", "text.txt"],
+     [:content_type3, {:content_type => "text/plain"},     "text.txt", "5k.png"],
+     [:presence2,   {:message => "error"},                 "5k.png", nil, "error"],
+     [:size2,       {:in => 1..10240, :message => 'size is not between #{min} and #{max} bytes.'}, "5k.png", "12k.png", "size is not between 1 and 10240 bytes."],
+     [:content_type4,{:content_type => "image/png", :message => "error"},       "5k.png", "text.txt", "error"]].each do |args|
       context "with #{args[0]} validations" do
         setup do
           Dummy.class_eval do
@@ -100,6 +103,21 @@ class PaperclipTest < Test::Unit::TestCase
             assert_equal 1, @dummy.avatar.errors.length
           end
         end
+        
+        context "and an invalid file with :message" do
+          setup do
+            @file = args[3] && File.new(File.join(FIXTURES_DIR, args[3]))
+          end
+
+          should "have errors" do
+            if args[1] && args[1][:message] && args[4]
+              @dummy.avatar = @file
+              assert ! @dummy.avatar.valid?
+              assert_equal 1, @dummy.avatar.errors.length
+              assert_equal args[4], @dummy.avatar.errors[0]
+            end
+          end
+        end
       end
     end
   end