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# frozen_string_literal: true
class MigrateCustomFilters < ActiveRecord::Migration[6.1]
def up
# Preserve IDs as much as possible to not confuse existing clients.
# As long as this migration is irreversible, we do not have to deal with conflicts.
safety_assured do
execute <<-SQL.squish
INSERT INTO custom_filter_keywords (id, custom_filter_id, keyword, whole_word, created_at, updated_at)
SELECT id, id, phrase, whole_word, created_at, updated_at
FROM custom_filters
SQL
end
end
def down
# Copy back changes from custom filters guaranteed to be from the old API
safety_assured do
execute <<-SQL.squish
UPDATE custom_filters
SET phrase = custom_filter_keywords.keyword, whole_word = custom_filter_keywords.whole_word
FROM custom_filter_keywords
WHERE custom_filters.id = custom_filter_keywords.id AND custom_filters.id = custom_filter_keywords.custom_filter_id
SQL
end
# Drop every keyword as we can't safely provide a 1:1 mapping
safety_assured do
execute <<-SQL.squish
TRUNCATE custom_filter_keywords RESTART IDENTITY
SQL
end
end
end
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