Re: jsonb_set() strictness considered harmful to data - Mailing list pgsql-general

## Ariadne Conill (ariadne@dereferenced.org):

>    update users set info=jsonb_set(info, '{bar}', info->'foo');
> 
> Typically, this works nicely, except for cases where evaluating
> info->'foo' results in an SQL null being returned.  When that happens,
> jsonb_set() returns an SQL null, which then results in data loss.[3]

So why don't you use the facilities of SQL to make sure to only
touch the rows which match the prerequisites?

  UPDATE users SET info = jsonb_set(info, '{bar}', info->'foo')
    WHERE info->'foo' IS NOT NULL;

No special wrappers required.

Regards,
Christoph

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