How do I modify fields inside the new PostgreSQL JSON datatype?

Question

With postgresql 9.3 I can SELECT specific fields of a JSON data type, but how do you modify them using UPDATE? I can\'t find any examples of this in the postgresql documenta

Answer 1

UPDATE table_name SET attrs = jsonb_set(cast(attrs as jsonb), '{key}', '"new_value"', true) WHERE id = 'some_id';

This what worked for me, attrs is a json type field. first cast to jsonb then update.

or

UPDATE table_name SET attrs = jsonb_set(cast(attrs as jsonb), '{key}', '"new_value"', true) WHERE attrs->>key = 'old_value';