It seems to me that you are doing the right thing. Here is a little
script that also does the same thing that you can play with:
import metakit
db = metakit.storage()
vw = db.getas('metakit[data:S,base:S]')
# add a row
vw.insert(0,{'data':'hi'})
metakit.dump(vw)
# data base
# ---- ----
# hi
# ---- ----
# Total: 1 rows
# find a row to update
rows = vw.select(data="hi")
if not rows:
raise "Could not find a row to update"
print
print "altered row"
row = rows[0]
description = ['data','base']
dict = {'data':'foo'}
setattr(row, 'data', dict.get('data'))
metakit.dump(vw)
# data base
# ---- ----
# foo
# ---- ----
# Total: 1 rows
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