How to Fix Drizzle Schema Error in AI-Built Apps
Drizzle ORM schema definitions cause migration failures or type mismatches. AI-generated Drizzle schemas often use incorrect column types, missing relations, or incompatible default values.
Error messages you might see
TypeError: Cannot read properties of undefined (reading 'referencedTable')Error: There is not enough information to infer relation between tablesWhy this happens in AI-generated code
Incomplete relation definitions
AI defines a foreign key column but forgets the `relations()` definition needed for Drizzle's query builder.
Wrong column type for the database
AI uses Postgres-specific types like `serial` when targeting MySQL, or vice versa.
Circular schema imports
AI splits schema files in a way that creates circular dependencies between table definitions.
How to fix it
Define relations explicitly
Add `relations()` calls for every foreign key. Drizzle requires both the column reference and the relation definition.
Use the correct dialect imports
Import from `drizzle-orm/pg-core` for Postgres, `drizzle-orm/mysql-core` for MySQL. Never mix dialects.
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Frequently asked questions
How do I generate migrations with Drizzle?
Run `npx drizzle-kit generate` to create SQL migration files from your schema changes, then `npx drizzle-kit migrate` to apply them.
Can I use Drizzle with Supabase?
Yes. Use `drizzle-orm/postgres-js` with your Supabase connection string. Be sure to use the direct connection URL, not the pooler, for migrations.
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