55 lines
3.1 KiB
Ruby
55 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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class AddColumnsToPostgresForeignKeys < Gitlab::Database::Migration[2.0]
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def up
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execute(<<~SQL)
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CREATE OR REPLACE VIEW postgres_foreign_keys AS
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SELECT
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pg_constraint.oid AS oid,
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pg_constraint.conname AS name,
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constrained_namespace.nspname::text || '.'::text || constrained_table.relname::text AS constrained_table_identifier,
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referenced_namespace.nspname::text || '.'::text || referenced_table.relname::text AS referenced_table_identifier,
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constrained_table.relname::text AS constrained_table_name,
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referenced_table.relname::text AS referenced_table_name,
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constrained_cols.constrained_columns,
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referenced_cols.referenced_columns,
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pg_constraint.confdeltype AS on_delete_action,
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pg_constraint.coninhcount > 0 as is_inherited
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FROM pg_constraint
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INNER JOIN pg_class constrained_table ON constrained_table.oid = pg_constraint.conrelid
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INNER JOIN pg_class referenced_table ON referenced_table.oid = pg_constraint.confrelid
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INNER JOIN pg_namespace constrained_namespace ON constrained_table.relnamespace = constrained_namespace.oid
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INNER JOIN pg_namespace referenced_namespace ON referenced_table.relnamespace = referenced_namespace.oid
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CROSS JOIN LATERAL (
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SELECT array_agg(pg_attribute.attname ORDER BY conkey.idx) -- must order here so that attributes are in correct order in array
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FROM unnest(pg_constraint.conkey) WITH ORDINALITY conkey(attnum, idx)
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INNER JOIN pg_attribute ON pg_attribute.attnum = conkey.attnum AND pg_attribute.attrelid = constrained_table.oid
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) constrained_cols(constrained_columns)
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CROSS JOIN LATERAL (
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SELECT array_agg(pg_attribute.attname ORDER BY confkey.idx)
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FROM unnest(pg_constraint.confkey) WITH ORDINALITY confkey(attnum, idx)
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INNER JOIN pg_attribute ON pg_attribute.attnum = confkey.attnum AND pg_attribute.attrelid = referenced_table.oid
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) referenced_cols(referenced_columns)
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WHERE contype = 'f';
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SQL
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end
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def down
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execute(<<~SQL)
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DROP VIEW IF EXISTS postgres_foreign_keys;
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CREATE OR REPLACE VIEW postgres_foreign_keys AS
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SELECT
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pg_constraint.oid AS oid,
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pg_constraint.conname AS name,
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constrained_namespace.nspname::text || '.'::text || constrained_table.relname::text AS constrained_table_identifier,
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referenced_namespace.nspname::text || '.'::text || referenced_table.relname::text AS referenced_table_identifier
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FROM pg_constraint
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INNER JOIN pg_class constrained_table ON constrained_table.oid = pg_constraint.conrelid
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INNER JOIN pg_class referenced_table ON referenced_table.oid = pg_constraint.confrelid
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INNER JOIN pg_namespace constrained_namespace ON constrained_table.relnamespace = constrained_namespace.oid
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INNER JOIN pg_namespace referenced_namespace ON referenced_table.relnamespace = referenced_namespace.oid
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WHERE contype = 'f';
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SQL
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end
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end
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