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