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class AddUniqueIndexOnCustomFieldsTrackers < ActiveRecord::Migration[4.2]
def up
table_name = "#{CustomField.table_name_prefix}custom_fields_trackers#{CustomField.table_name_suffix}"
duplicates = CustomField.connection.select_rows("SELECT custom_field_id, tracker_id FROM #{table_name} GROUP BY custom_field_id, tracker_id HAVING COUNT(*) > 1")
duplicates.each do |custom_field_id, tracker_id|
# Removes duplicate rows
CustomField.connection.execute("DELETE FROM #{table_name} WHERE custom_field_id=#{custom_field_id} AND tracker_id=#{tracker_id}")
# And insert one
CustomField.connection.execute("INSERT INTO #{table_name} (custom_field_id, tracker_id) VALUES (#{custom_field_id}, #{tracker_id})")
end
if index_exists? :custom_fields_trackers, [:custom_field_id, :tracker_id]
remove_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
end
add_index :custom_fields_trackers, [:custom_field_id, :tracker_id], :unique => true
end
def down
if index_exists? :custom_fields_trackers, [:custom_field_id, :tracker_id]
remove_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
end
add_index :custom_fields_trackers, [:custom_field_id, :tracker_id]
end
end
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