"Download json dump" causes crash for some days

[JGreenlee]

I observe a crash on attempting to export certain days of travel. It affects 1.3.3 (currently on production) and 1.3.7 (currently on staging). Both iOS and Android.

Steps to reproduce:

• Sign into my OPCode (or another affected user)
• Profile > Download json dump
• Choose May 6 (or other affected day)
• Confirm, popup closes
• Wait for ~10-30 seconds
• App crashes, 'share' menu never appears

My speculation is that this only affects days with a lot of travel - maybe the sensed data is being retrieved in some unsafe way such that we run out of memory

[Abby-Wheelis]

Attempts to reproduce this, testing with @JGreenlee's code on May 6th:

• iPhone8 - takes about 5 seconds, but loads just fine
• SamsungGalaxy - took about 8 seconds but loading fine
• iPhoneSE - took about 7 seconds loading still fine

Unfortunately, I have not been able to reproduce the issue, I even tried one day on the Galaxy where I had 20 trips recorded and it loaded to the share page relatively quickly.

I did notice on the iPhone especially that this date-picker is not user friendly, I frequently somehow loaded a day when only trying to arrow between months. I think switching out the date picker should be something we target in the migration process.

I'm also noticing that there's a popup warning me I that I have to have email configured, even though I do have it on the phone - not entirely sure if that is the desired behavior, and it's only happening on the iPhones.

[JGreenlee]

Interesting. Maybe it is more device-specific than I thought. I'll try some others.

[shankari]

I'm also noticing that there's a popup warning me I that I have to have email configured, even though I do have it on the phone - not entirely sure if that is the desired behavior, and it's only happening on the iPhones.

I think that is because the mail app only works with Apple Mail, not with Gmail (at least on the basic configuration). We had a lot of people who were only using gmail, and then they complained that the email wouldn't work. I'd be OK with removing that popup if we can do better with the error messages. I am just not very patient about creating popups for all the error conditions.