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# frozen_string_literal: true
class AddForeignKeysView < ActiveRecord::Migration[6.1]
def up
execute(<<~SQL)
CREATE OR REPLACE VIEW postgres_foreign_keys AS
SELECT
pg_constraint.oid AS oid,
pg_constraint.conname AS name,
constrained_namespace.nspname::text || '.'::text || constrained_table.relname::text AS constrained_table_identifier,
referenced_namespace.nspname::text || '.'::text || referenced_table.relname::text AS referenced_table_identifier
FROM pg_constraint
INNER JOIN pg_class constrained_table ON constrained_table.oid = pg_constraint.conrelid
INNER JOIN pg_class referenced_table ON referenced_table.oid = pg_constraint.confrelid
INNER JOIN pg_namespace constrained_namespace ON constrained_table.relnamespace = constrained_namespace.oid
INNER JOIN pg_namespace referenced_namespace ON referenced_table.relnamespace = referenced_namespace.oid
WHERE contype = 'f';
SQL
end
def down
execute(<<~SQL)
DROP VIEW IF EXISTS postgres_foreign_keys
SQL
end
end
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