discourse/db/migrate/20140715160720_update_users...

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class UpdateUsersCaseInsensitiveEmails < ActiveRecord::Migration[4.2]
2014-07-14 10:16:24 -04:00
def up
execute "DROP INDEX index_users_on_email"
# Find duplicate emails.
results = execute <<SQL
SELECT id, email, count
FROM (SELECT id, email,
row_number() OVER(PARTITION BY lower(email) ORDER BY id asc) AS count
FROM users) dups
WHERE dups.count > 1
SQL
results.each do |row|
execute "UPDATE users SET email = '#{row['email'].downcase}#{row['count']}' WHERE id = #{row['id']}"
end
execute "UPDATE users SET email = lower(email)"
execute "CREATE UNIQUE INDEX index_users_on_email ON users ((lower(email)));"
end
def down
execute "DROP INDEX index_users_on_email"
execute "CREATE UNIQUE INDEX index_users_on_email ON users (email);"
end
end