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13 lines
553 B
Ruby
13 lines
553 B
Ruby
class StrongerUniqueIndexOnSecurity < ActiveRecord::Migration[7.2]
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def change
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remove_index :securities, [ :ticker, :exchange_operating_mic ], unique: true
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# Matches our ActiveRecord validation:
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# - uppercase ticker
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# - either exchange_operating_mic or empty string (unique index doesn't work with NULL values)
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add_index :securities,
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"UPPER(ticker), COALESCE(UPPER(exchange_operating_mic), '')",
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unique: true,
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name: "index_securities_on_ticker_and_exchange_operating_mic_unique"
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end
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end
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