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Merge pull request #849 from DFE-Digital/1173-data-versioning
Add data versioning.
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PaperTrail.serializer = PaperTrail::Serializers::JSON |
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# This migration creates the `versions` table, the only schema PT requires. | ||
# All other migrations PT provides are optional. | ||
class CreateVersions < ActiveRecord::Migration[6.1] | ||
# 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 | ||
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def change | ||
create_table :versions do |t| | ||
t.string :item_type, null: false | ||
t.bigint :item_id, null: false | ||
t.string :event, null: false | ||
t.string :whodunnit | ||
t.text :object, limit: TEXT_BYTES | ||
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# 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 |
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