From 8aa230271ec6f0cd578e479c42d95418cb9408c3 Mon Sep 17 00:00:00 2001
From: Xinhui
Date: Tue, 21 Nov 2017 15:27:17 +0100
Subject: Add gem paper_trail

---
 db/migrate/20171121142536_create_versions.rb | 34 ++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 db/migrate/20171121142536_create_versions.rb

(limited to 'db')

diff --git a/db/migrate/20171121142536_create_versions.rb b/db/migrate/20171121142536_create_versions.rb
new file mode 100644
index 000000000..ff794f9e1
--- /dev/null
+++ b/db/migrate/20171121142536_create_versions.rb
@@ -0,0 +1,34 @@
+class CreateVersions < ActiveRecord::Migration
+
+  # The largest text column available in all supported RDBMS is
+  # 1024^3 - 1 bytes, roughly one gibibyte.  We specify a size
+  # so that MySQL will use `longtext` instead of `text`.  Otherwise,
+  # when serializing very large objects, `text` might not be big enough.
+  TEXT_BYTES = 1_073_741_823
+
+  def change
+    create_table :versions do |t|
+      t.string   :item_type, :null => false
+      t.integer  :item_id,   :null => false
+      t.string   :event,     :null => false
+      t.string   :whodunnit
+      t.text     :object,    :limit => TEXT_BYTES
+
+      # Known issue in MySQL: fractional second precision
+      # -------------------------------------------------
+      #
+      # MySQL timestamp columns do not support fractional seconds unless
+      # defined with "fractional seconds precision". MySQL users should manually
+      # add fractional seconds precision to this migration, specifically, to
+      # the `created_at` column.
+      # (https://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html)
+      #
+      # MySQL users should also upgrade to rails 4.2, which is the first
+      # version of ActiveRecord with support for fractional seconds in MySQL.
+      # (https://github.com/rails/rails/pull/14359)
+      #
+      t.datetime :created_at
+    end
+    add_index :versions, [:item_type, :item_id]
+  end
+end
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