Django admin custom filter: ProgrammingError: more than one row returned by a subquery used as an expression

Hi, I'm trying this custom filter query for django admin

return queryset.extra(select = {'val': "select id from web_quote WHERE character_length(quote_text) < 30"})

and I got something like this:

Programming error: more than one row returned by a subquery used as an expression

Basically I'm trying to filter quote_text column which length of the string less than 30...

Any ideas?

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