[Rails] Variable Access in Prawn

Hi, i am working on a rails app, and i generate the page using Prawn for
PDF, but while i use this command:

<%=@carbon_calculate.comments%> on the show.html.pdf, it generates just
the only column available for display in the database, but

in the show.pdf, uisng the same command generates other columns in the
table which are not meant to be accessable, e.g date created, time e.t.c

please what can i do

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