27 lines
1.1 KiB
Ruby
27 lines
1.1 KiB
Ruby
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# frozen_string_literal: true
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class AddForeignKeysView < ActiveRecord::Migration[6.1]
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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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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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def down
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execute(<<~SQL)
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DROP VIEW IF EXISTS postgres_foreign_keys
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SQL
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end
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end
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