lo there all,
i am having a problem making each_with_index do what i need it to do.
the issue is…
i need to evaluate the gpm of a flow sensor.
we are skipping over three database entries to get the values.
difference in value / difference in time = gpm. ok, easy enough.
but this code
@flow_sensor.flow_hits.each_with_index do |hit, i|
if i > 4 # start with 3rd hit in db
time_diff = hit[i].date_time.to_i -
hit[i-3].date_time.to_i
value_diff = hit[i].value - hit[i-3].value
min = time_diff / 60
val = value_diff / min
plots.push(val)
times.push(hit[i].date_time)
end
end
is giving me a nil value evaluating nil.date_time
this is for a rails app by the way.
i know i have the models set up right, because other functions are
working.
thats why i think my structure is wrong.
thanks.