added attachment_fu and made the set of changes

[selectricity-live] / vendor / plugins / attachment_fu / lib / technoweenie / attachment_fu / backends / db_file_backend.rb

diff --git a/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/backends/db_file_backend.rb b/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/backends/db_file_backend.rb
new file mode 100644 (file)
index 0000000..23881e7
--- /dev/null
+++ b/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/backends/db_file_backend.rb
@@ -0,0 +1,39 @@
+module Technoweenie # :nodoc:
+  module AttachmentFu # :nodoc:
+    module Backends
+      # Methods for DB backed attachments
+      module DbFileBackend
+        def self.included(base) #:nodoc:
+          Object.const_set(:DbFile, Class.new(ActiveRecord::Base)) unless Object.const_defined?(:DbFile)
+          base.belongs_to  :db_file, :class_name => '::DbFile', :foreign_key => 'db_file_id'
+        end
+
+        # Creates a temp file with the current db data.
+        def create_temp_file
+          write_to_temp_file current_data
+        end
+        
+        # Gets the current data from the database
+        def current_data
+          db_file.data
+        end
+        
+        protected
+          # Destroys the file.  Called in the after_destroy callback
+          def destroy_file
+            db_file.destroy if db_file
+          end
+          
+          # Saves the data to the DbFile model
+          def save_to_storage
+            if save_attachment?
+              (db_file || build_db_file).data = temp_data
+              db_file.save!
+              self.class.update_all ['db_file_id = ?', self.db_file_id = db_file.id], ['id = ?', id]
+            end
+            true
+          end
+      end
+    end
+  end
+end
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