35 lines
909 B
Ruby
35 lines
909 B
Ruby
class AddUserBadgeUniqueIndex < ActiveRecord::Migration
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def up
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# used to keep badges distinct
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add_column :user_badges, :seq, :integer, default: 0, null: false
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# invent artificial seq for badges
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execute "
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UPDATE user_badges ub1 SET seq = X.seq
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FROM (
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SELECT ub.id, rank() OVER (PARTITION BY user_id ORDER BY granted_at) seq
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FROM user_badges ub
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JOIN badges b ON b.id = ub.badge_id
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WHERE b.multiple_grant
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) X
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WHERE ub1.id = X.id
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"
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# delete all single award dupes
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execute "
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DELETE FROM user_badges ub1
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WHERE ub1.id NOT IN (
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SELECT MIN(ub.id)
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FROM user_badges ub
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GROUP BY ub.user_id, ub.badge_id, ub.seq
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)
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"
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add_index :user_badges, [:badge_id, :user_id, :seq], unique: true, where: 'post_id IS NULL'
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end
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def down
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remove_column :user_badges, :seq, :integer
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end
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end
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