What it does

Flags Drizzle queries inside callbacks passed to .map(), .filter(), .forEach(), promise handlers, or event listeners.

Why it matters

Queries inside callbacks are executed asynchronously and often unintentionally — the callback runs once per element, creating multiple overlapping queries.

How it works

Pulsar inspects the AST to determine whether a query expression appears inside a callback argument — for example, the function passed to .map(), .filter(), .forEach(), .then(), or event listeners. Queries inside callbacks are flagged even though modern engines may handle them concurrently.

When to disable

Disable this rule if you are intentionally running concurrent queries inside callbacks and have verified the pattern is safe (e.g., with connection pooling and limited batch size).

Examples

const users = await Promise.all(
  ids.map(
    (id) => db.select().from(users).where(eq(users.id, id)), 
  ),
);

const users = await db.select().from(users).where(inArray(users.id, ids));