Added code for defining SHA attributes

These attributes are stored in binary in the database, but exposed as
strings. This allows one to query/create data using plain SHA1 hashes as
Strings, while storing them more efficiently as binary.

1 files changed, 18 insertions, 0 deletions

diff --git a/app/models/concerns/sha_attribute.rb b/app/models/concerns/sha_attribute.rb
new file mode 100644
index 00000000000..c28974a3cdf
--- /dev/null
+++ b/app/models/concerns/sha_attribute.rb
@@ -0,0 +1,18 @@
+module ShaAttribute
+  extend ActiveSupport::Concern
+
+  module ClassMethods
+    def sha_attribute(name)
+      column = columns.find { |c| c.name == name.to_s }
+
+      # In case the table doesn't exist we won't be able to find the column,
+      # thus we will only check the type if the column is present.
+      if column && column.type != :binary
+        raise ArgumentError,
+          "sha_attribute #{name.inspect} is invalid since the column type is not :binary"
+      end
+
+      attribute(name, Gitlab::Database::ShaAttribute.new)
+    end
+  end
+end