21 lines
548 B
Ruby
21 lines
548 B
Ruby
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# frozen_string_literal: true
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class RemoveDuplicateReactions < ActiveRecord::Migration[7.0]
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def up
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execute <<~SQUIRREL
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DELETE FROM reactions
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WHERE id IN (
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SELECT id FROM (
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SELECT id, row_number() over (PARTITION BY parent_type, parent_id, user_id ORDER BY id) AS row_number FROM reactions
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)s WHERE row_number >= 2
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)
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SQUIRREL
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add_index :reactions, %i[parent_type parent_id user_id], unique: true
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end
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def down
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remove_index :reactions, %i[parent_type parent_id user_id]
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end
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end
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