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11 lines
570 B
11 lines
570 B
5 years ago
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class AddUniqIndexToSalesmanCustomer < ActiveRecord::Migration[5.2]
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def change
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sql = %Q(delete from salesman_customers where (salesman_id, user_id) in
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(select * from (select salesman_id, user_id from salesman_customers group by salesman_id, user_id having count(*) > 1) a)
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and id not in (select * from (select min(id) from salesman_customers group by salesman_id, user_id having count(*) > 1 order by id) b))
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ActiveRecord::Base.connection.execute sql
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add_index :salesman_customers, [:salesman_id, :user_id], unique: true
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end
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end
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