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9 lines
255 B
Ruby
9 lines
255 B
Ruby
# frozen_string_literal: true
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class AddExternalIdToTopics < ActiveRecord::Migration[6.1]
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def change
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add_column :topics, :external_id, :string, null: true
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add_index :topics, :external_id, unique: true, where: "external_id IS NOT NULL"
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end
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end
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