From e9f28cbd61f670b9a6dd9a06fa6d496df0a76e1d Mon Sep 17 00:00:00 2001
From: Ivan Gonzalez <hi@dreamingecho.es>
Date: Thu, 27 Jul 2017 16:20:11 +0200
Subject: [PATCH] Add new add_prefix function in paper_trail module

This new function will allow the user to add information to the Ecto
meta :prefix in order to use a different tenant for the operation on
the version struct.
---
 lib/paper_trail.ex | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/paper_trail.ex b/lib/paper_trail.ex
index 20253f8e..03c9ab35 100644
--- a/lib/paper_trail.ex
+++ b/lib/paper_trail.ex
@@ -267,7 +267,7 @@ defmodule PaperTrail do
       end,
       origin: options[:origin],
       meta: options[:meta]
-    }
+    } |> add_prefix(options[:prefix])
   end
   defp make_version_struct(%{event: "update"}, changeset, options) do
     originator_ref = options[@originator[:name]] || options[:originator]
@@ -282,7 +282,7 @@ defmodule PaperTrail do
       end,
       origin: options[:origin],
       meta: options[:meta]
-    }
+    } |> add_prefix(options[:prefix])
   end
   defp make_version_struct(%{event: "delete"}, model, options) do
     originator_ref = options[@originator[:name]] || options[:originator]
@@ -297,7 +297,7 @@ defmodule PaperTrail do
       end,
       origin: options[:origin],
       meta: options[:meta]
-    }
+    } |> add_prefix(options[:prefix])
   end
 
   defp get_sequence_from_model(changeset) do
@@ -318,4 +318,7 @@ defmodule PaperTrail do
     relationships = model.__struct__.__schema__(:associations)
     Map.drop(model, [:__struct__, :__meta__] ++ relationships)
   end
+
+  defp add_prefix(changeset), do: changeset
+  defp add_prefix(changeset, prefix), do: Ecto.put_meta(changeset, prefix: prefix)
 end