39 lines
1.6 KiB
Ruby
39 lines
1.6 KiB
Ruby
|
# This migration creates the `versions` table, the only schema PT requires.
|
||
|
|
# All other migrations PT provides are optional.
|
||
|
|
class CreateVersions < ActiveRecord::Migration[7.0]
|
||
|
|
|
||
|
|
# 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.string :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 at least rails 4.2, which is the first
|
||
|
|
# version of ActiveRecord with support for fractional seconds in MySQL.
|
||
|
|
# (https://github.com/rails/rails/pull/14359)
|
||
|
|
#
|
||
|
|
# MySQL users should use the following line for `created_at`
|
||
|
|
# t.datetime :created_at, limit: 6
|
||
|
|
t.datetime :created_at
|
||
|
|
end
|
||
|
|
add_index :versions, %i(item_type item_id)
|
||
|
|
end
|
||
|
|
end
|