Rust

It was basically me passing BaseArmy in as a param to a fucntion, then returning an Army type. I tried a few different things, but what I really wanted to do was just spread out the struct like I would in Typescript. Rust seems to support this UNLESS there's one field that's different.

Let me give builder pattern a try. I was literally just learning more about it, but didn't think to apply it here.

EDIT:

Here's what' I'm trying to do: Battalion { count: count, position, ..db_battalion_template }

Then the error I get:

mismatched types expected Battalion, found BattalionTemplate

EDIT2:

After more fiddling around and adding the from conversion:

Battalion { count: count, position, ..Battalion::from(db_battalion_template) } impl From<BattalionTemplate> for Battalion { fn from(a: BattalionTemplate) -> Self { let serialized = serde_json::to_string(&a).unwrap(); Self { position: 0, ..serde_json::from_str(&serialized).unwrap() } } }

I get this error: thread 'main' panicked at 'called Result::unwrap() on an Err value: Error("missing field position", line: 1, column: 227)'

Edit 3:

I at least got the from conversion to work by just manually specifying the Battalion fields. Should I just accept that I can't spread struct properties from one type on to another unless they have exactly the same fields?