Match domain language

lib/active_file/blob.rb

 require "active_file/site"
 
-# Schema: id, key, filename, content_type, metadata, byte_size, digest, created_at
+# Schema: id, key, filename, content_type, metadata, byte_size, checksum, created_at
 class ActiveFile::Blob < ActiveRecord::Base
   self.table_name = "active_file_blobs"
 

lib/active_file/migration.rb

@@ -5,7 +5,7 @@ def change
       t.string :filename
       t.string :content_type
       t.integer :byte_size
-      t.string :digest
+      t.string :checksum
       t.time :created_at
 
       t.index [ :token ], unique: true