Add reminder on google calendar with golang - go

Question

I want to add a custom reminder to Google Calendar with golang:
event := &calendar.Event{
Summary: "Test GG calendar",
Location: "31 AAA",
Description: "Test google calendar",
Start: &calendar.EventDateTime{
DateTime: "2016-12-27T17:30:00+07:00",
TimeZone: "Asia/Ho_Chi_Minh",
},
End: &calendar.EventDateTime{
DateTime: "2016-12-27T17:40:00+07:00",
TimeZone: "Asia/Ho_Chi_Minh",
},
Reminders: &calendar.EventReminders{
Overrides: []*calendar.EventReminder{
{Method: "email", Minutes: 30},
{Method: "popup", Minutes: 10},
},
UseDefault: false,
},
}
When I run this code, google could not add event. I received this error: Unable to create event. googleapi: Error 400: Cannot specify both default reminders and overrides at the same time., cannotUseDefaultRemindersAndSpecifyOverride
Thanks

Answer 1

Based on my reading of google-apps/calendar/concepts/reminders, it seems that you should not specify the UseDefault: false, at the same time as setting the Overrides. Do not put the UseDefault: false, part, and it will be defaulting to false as its only required to set when wanting to remove overrides that are in place already.
So the expected code is:
event := &calendar.Event{
Summary: "Test GG calendar",
Location: "31 AAA",
Description: "Test google calendar",
Start: &calendar.EventDateTime{
DateTime: "2016-12-27T17:30:00+07:00",
TimeZone: "Asia/Ho_Chi_Minh",
},
End: &calendar.EventDateTime{
DateTime: "2016-12-27T17:40:00+07:00",
TimeZone: "Asia/Ho_Chi_Minh",
},
Reminders: &calendar.EventReminders{
Overrides: []*calendar.EventReminder{
{Method: "email", Minutes: 30},
{Method: "popup", Minutes: 10},
},
},
}

Answer 2

You should send ForceSendFields with UseDefault and set UseDefault to false
&calendar.EventReminders{
Overrides: []*calendar.EventReminder{
{
Method: "email",
Minutes: 12,
},
},
UseDefault: false,
ForceSendFields: []string{"UseDefault"},
}