25 lines
1.2 KiB
Ruby
25 lines
1.2 KiB
Ruby
class AddUniqueIndexOnCustomFieldsTrackers < ActiveRecord::Migration
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def up
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table_name = "#{CustomField.table_name_prefix}custom_fields_trackers#{CustomField.table_name_suffix}"
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duplicates = CustomField.connection.select_rows("SELECT custom_field_id, tracker_id FROM #{table_name} GROUP BY custom_field_id, tracker_id HAVING COUNT(*) > 1")
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duplicates.each do |custom_field_id, tracker_id|
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# Removes duplicate rows
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CustomField.connection.execute("DELETE FROM #{table_name} WHERE custom_field_id=#{custom_field_id} AND tracker_id=#{tracker_id}")
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# And insert one
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CustomField.connection.execute("INSERT INTO #{table_name} (custom_field_id, tracker_id) VALUES (#{custom_field_id}, #{tracker_id})")
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end
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if index_exists? :custom_fields_trackers, [:custom_field_id, :tracker_id]
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remove_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
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end
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add_index :custom_fields_trackers, [:custom_field_id, :tracker_id], :unique => true
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end
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def down
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if index_exists? :custom_fields_trackers, [:custom_field_id, :tracker_id]
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remove_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
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end
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add_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
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end
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end
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