trip_id changes over time, best practice for game to fetch a valid trip_id?

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Nelson Correia

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Apr 1, 2021, 10:02:34 AMApr 1
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Hello Everyone, thank you for permitting me to join the group.

I am currently working on a personal project to help my son learn how to read analog clocks. He loves riding the Red Line and so I am using the API to build a game as way to make the learning process fun for him.

After taking some time off from the project, I learned that the request string was no longer valid. My understanding, at this point, is that the trip_ids expire over time.

Is there a best practice to fetch a valid trip_id automatically, so that the game can run without scheduled adjustments? Thank you.

Developer at MBTA

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Apr 6, 2021, 3:30:27 PMApr 6
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Hi,

You're correct that trip IDs are not stable over time, since of course the scheduled service on a line changes over time, which necessitates adding or removing trips.

If you just want to fetch any single valid trip on the Red Line, you can use the `route` filter on the `/trips` endpoint (e.g. /trips?filter[route]=Red&page[limit]=1). Similarly, you can filter the `/schedules` and `/predictions` endpoints by route if you'd like to directly get a stop time for the game without going through trips.

Route IDs are stable over time unless the route itself is eliminated — unlikely, in the case of the Red Line, but if you wanted to avoid hard-coding any specific ID you could request `/routes` and pick one (this endpoint has no required filters).

Hope this helps,
—Developer@MBTA

Nelson Correia

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Apr 7, 2021, 11:45:13 AMApr 7
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Hello Developer @ MBTA,

Thank you so much for the response. This is great! It takes much of the guess work out.

On a side note, there's another conversation that I would like to vote up:


Adding announcements to the game would definitely level up the fun factor.

Michael G

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Apr 9, 2021, 10:10:33 AMApr 9
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Thank you for supporting my post! Hopefully we will get them soon. 
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