Implement data persistence

[18-F-cali]

We could we json as data structure and store it in files ?

[John]

Maybe use a sqlite database?

[chrisK00]

Maybe use a sqlite database?

we are trying to keep it as simple as possible so would prolly be best avoiding sql. i think startin with json is great, or something like MongoDb or even LiteDb

[John]

Maybe use a sqlite database?

we are trying to keep it as simple as possible so would prolly be best avoiding sql. i think startin with json is great, or something like MongoDb or even LiteDb

Oh yup, in that case I think Mongo is a good idea.

[18-F-cali]

No idea how to work with databases
how about we do file persistence first and then db persistence ?

[John]

Would probably be more work to roll your own file reading and loading than just wiring up entity framework with mongodb

[18-F-cali]

Cool, Will check it out then.
Any recommendation to learn more about it?

[chrisK00]

Cool, Will check it out then.
Any recommendation to learn more about it?

Mongodb has free courses on their site. Kniw tim corey also has 1 about it

[John]

MongoDb does not actually support EF directly. But I still think Mongo even on it's own is a good option.
Here's a document that can help someone get started: https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mongo-app?view=aspnetcore-5.0&tabs=visual-studio
If this isn't worked out, can maybe have a call sometime this week and run through it.

[18-F-cali]

As discussed lets use liteDB

[18-F-cali]

while going through docs I found litedb does not support Datetimeoffset:

but Stack overflowsuggets to convert store the time as a timestamp which is a long. So store DateTimeOffset.ToUnixTimeSeconds() when you store the data and DateTimeOffset.FromUnixTimeSeconds() when you retrieve it.

And I didn't fully understand the second suggestion.

[18-F-cali]

There is also this suggestion

mapper.RegisterType<DateTime>(
    value => value.ToString("o", CultureInfo.InvariantCulture),
    bson => DateTime.ParseExact(bson, "o", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind));
mapper.RegisterType<DateTimeOffset>(
    value => value.ToString("o", CultureInfo.InvariantCulture),
    bson => DateTimeOffset.ParseExact(bson, "o", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind));

using (var db = new LiteDatabase("instance.db", mapper))
{
    ...
}