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# frozen_string_literal: true
class AddColumnsToPostgresForeignKeys < Gitlab::Database::Migration[2.0]
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,
constrained_table.relname::text AS constrained_table_name,
referenced_table.relname::text AS referenced_table_name,
constrained_cols.constrained_columns,
referenced_cols.referenced_columns,
pg_constraint.confdeltype AS on_delete_action,
pg_constraint.coninhcount > 0 as is_inherited
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
CROSS JOIN LATERAL (
SELECT array_agg(pg_attribute.attname ORDER BY conkey.idx) -- must order here so that attributes are in correct order in array
FROM unnest(pg_constraint.conkey) WITH ORDINALITY conkey(attnum, idx)
INNER JOIN pg_attribute ON pg_attribute.attnum = conkey.attnum AND pg_attribute.attrelid = constrained_table.oid
) constrained_cols(constrained_columns)
CROSS JOIN LATERAL (
SELECT array_agg(pg_attribute.attname ORDER BY confkey.idx)
FROM unnest(pg_constraint.confkey) WITH ORDINALITY confkey(attnum, idx)
INNER JOIN pg_attribute ON pg_attribute.attnum = confkey.attnum AND pg_attribute.attrelid = referenced_table.oid
) referenced_cols(referenced_columns)
WHERE contype = 'f';
SQL
end
def down
execute(<<~SQL)
DROP VIEW IF EXISTS postgres_foreign_keys;
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
end
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