Callbacks: Added Rails 4.1+ terminator conditional

.travis.yml

@@ -17,6 +17,7 @@ gemfile:
   - gemfiles/3.1.gemfile
   - gemfiles/3.2.gemfile
   - gemfiles/4.0.gemfile
+  - gemfiles/4.1.gemfile
 
 matrix:
   allow_failures:
@@ -26,3 +27,5 @@ matrix:
   exclude:
       - rvm: 1.9.2
         gemfile: gemfiles/4.0.gemfile
+      - rvm: 1.9.2
+        gemfile: gemfiles/4.1.gemfile

Appraisals

@@ -17,3 +17,8 @@ appraise "4.0" do
   gem "rails", "~> 4.0.0"
   gem "paperclip", :path => "../"
 end
+
+appraise "4.1" do
+  gem "rails", "~> 4.1.0.beta"
+  gem "paperclip", :path => "../"
+end

gemfiles/4.1.gemfile

+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "jruby-openssl", :platform=>:jruby
+gem "activerecord-jdbcsqlite3-adapter", :platform=>:jruby
+gem "sqlite3", :platform=>:ruby
+gem "rails", "~> 4.1.0.beta"
+gem "paperclip", :path=>"../"
+
+gemspec :path=>"../"

lib/paperclip/callbacks.rb

@@ -7,7 +7,7 @@ module Paperclip
 
     module Defining
       def define_paperclip_callbacks(*callbacks)
-        define_callbacks *[callbacks, {terminator: -> (target, result) {result == false}}].flatten
+        define_callbacks *[callbacks, {:terminator => callback_terminator}].flatten
         callbacks.each do |callback|
           eval <<-end_callbacks
             def before_#{callback}(*args, &blk)
@@ -19,6 +19,16 @@ module Paperclip
           end_callbacks
         end
       end
+
+      private
+
+      def callback_terminator
+        if Gem::Version.new(::Rails::VERSION::STRING) >= Gem::Version.new('4.1.0.beta')
+          lambda { |target, result| result == false }
+        else
+          'result == false'
+        end
+      end
     end
 
     module Running