01. February 2016

## Getting a sum of durations in rails

For my “I had trouble finding this on google” series, here’s a
solution I found to getting a total duration from a collection
of objects with durations stored as `Time`

objects.

```
total_duration = durations.reduce(Time.gm(2000)) do |total, time|
total += time.to_i
end
```

There are two little tricks happening here. The first is that
durations are stored as a time of day on January 1st, 2000, so
we use that as the reduce seed. The second thing is that the
`Time`

class defines addition for integer objects, but not for
other times, so you have to convert your duration to an integer first.

No rocket science here, but a couple little quirks that made it a little harder to add two times together than I expected.