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23 lines
825 B
23 lines
825 B
3 years ago
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# This migration creates the `versions` table, the only schema PT requires.
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# All other migrations PT provides are optional.
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class CreateVersions < ActiveRecord::Migration[7.0]
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# The largest text column available in all supported RDBMS is
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# 1024^3 - 1 bytes, roughly one gibibyte. We specify a size
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# so that MySQL will use `longtext` instead of `text`. Otherwise,
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# when serializing very large objects, `text` might not be big enough.
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TEXT_BYTES = 1_073_741_823
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def change
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create_table :versions do |t|
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t.string :item_type, null: false, limit: 191
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t.bigint :item_id, null: false
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t.string :event, null: false
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t.string :whodunnit
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t.text :object, limit: TEXT_BYTES
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t.datetime :created_at
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end
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add_index :versions, %i[item_type item_id]
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end
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end
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