Torben Sorensen
cf476e7afc
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45 lines
2.2 KiB
SQL
45 lines
2.2 KiB
SQL
-- Migration: Populate flyer_locations table with existing flyer→store relationships
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-- Purpose: The flyer_locations table was created in the initial schema but never populated.
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-- This migration populates it with data from the legacy flyer.store_id relationship.
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--
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-- Background: The schema correctly defines a many-to-many relationship between flyers
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-- and store_locations via the flyer_locations table, but all code was using
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-- the legacy flyer.store_id foreign key directly.
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-- Step 1: For each flyer with a store_id, link it to all locations of that store
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-- This assumes that if a flyer is associated with a store, it's valid at ALL locations of that store
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INSERT INTO public.flyer_locations (flyer_id, store_location_id)
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SELECT DISTINCT
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f.flyer_id,
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sl.store_location_id
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FROM public.flyers f
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JOIN public.store_locations sl ON f.store_id = sl.store_id
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WHERE f.store_id IS NOT NULL
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ON CONFLICT (flyer_id, store_location_id) DO NOTHING;
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-- Step 2: Add a comment documenting this migration
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COMMENT ON TABLE public.flyer_locations IS
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'A linking table associating a single flyer with multiple store locations where its deals are valid. Populated from legacy flyer.store_id relationships via migration 004.';
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-- Step 3: Verify the migration worked
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-- This should return the number of flyer_location entries created
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DO $$
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DECLARE
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flyer_location_count INTEGER;
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flyer_with_store_count INTEGER;
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BEGIN
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SELECT COUNT(*) INTO flyer_location_count FROM public.flyer_locations;
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SELECT COUNT(*) INTO flyer_with_store_count FROM public.flyers WHERE store_id IS NOT NULL;
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RAISE NOTICE 'Migration 004 complete:';
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RAISE NOTICE ' - Created % flyer_location entries', flyer_location_count;
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RAISE NOTICE ' - Based on % flyers with store_id', flyer_with_store_count;
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IF flyer_location_count = 0 AND flyer_with_store_count > 0 THEN
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RAISE EXCEPTION 'Migration 004 failed: No flyer_locations created but flyers with store_id exist';
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END IF;
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END $$;
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-- Note: The flyer.store_id column is kept for backward compatibility but should eventually be deprecated
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-- Future work: Add a migration to remove flyer.store_id once all code uses flyer_locations
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