How to fix Object not in prerequisite state in PostgreSQL

The safest and most direct approach is to use INSERT ... RETURNING to get the generated ID directly from the INSERT statement, rather than relying on currval() or lastval():

INSERT INTO users (name, email) 
VALUES ($1, $2) 
RETURNING id;

This approach works in all contexts and avoids the sequence state issue entirely.

If you must use currval() to retrieve a sequence value, you must call nextval() first in the same session:

SELECT nextval('users_id_seq');
SELECT currval('users_id_seq');

Note: This is rarely necessary if you use INSERT ... RETURNING instead.

If using PDO with PostgreSQL, pass the sequence name to lastInsertId():

$pdo->lastInsertId('table_id_seq');

However, this still relies on currval() internally. Switching to RETURNING is more reliable.

CREATE INDEX CONCURRENTLY must run outside a transaction block:

-- WRONG: Inside transaction
BEGIN;
CREATE INDEX CONCURRENTLY idx_users_email ON users(email);
COMMIT;

-- CORRECT: Top-level statement
CREATE INDEX CONCURRENTLY idx_users_email ON users(email);

If you need to refresh a materialized view, either:

1. Omit CONCURRENTLY if inside a transaction:

BEGIN;
REFRESH MATERIALIZED VIEW my_view;
COMMIT;

2. Or run CONCURRENTLY at top-level:

REFRESH MATERIALIZED VIEW CONCURRENTLY my_view;

If your framework (Doctrine, Drupal, Phalcon, etc.) is generating the error:

1. Check for a newer version that uses INSERT ... RETURNING
2. Disable auto-increment ID retrieval in the ORM config
3. Use raw SQL with RETURNING instead of the ORM's lastInsertId() method

Many modern ORMs have fixed this issue in recent versions.