How use Trie.put

[SvyatobatkoVlad]

I wrote CRUD. I really want to write a method that will change the value in Trie. There are examples with Trie.put?

My code: Here are the difficulties with changing the balance field in the Trie

[claudio]

Looking at similar code in the superheroes example, I think you might be wanting to call Trie.replace instead. Compare with:

dfinity/examples/blob/master/motoko/superheroes/src/superheroes/Main.mo#L59

[claudio]

Or perhaps the problem here is that you are passing Float.equal, not Nat32.equal, to compare the key (which I think is of type Nat32, not Float).

[SvyatobatkoVlad]

First I made Trie.find and then I wanted to make this change and only then Trie.put or Trie.replace.
But How?

[claudio]

If you share your code in a gist (or a git repo), I could try to make it work for you.

[SvyatobatkoVlad]

I found an answer from you here. Thank you

How to work with type record

let bindings aren’t mutable/updateable, but var bindings are. So either change to: var version : Nat32 = 1; // use var for a mutable/updatable variable ... ... version := exists.version; // use := for assignment (and use := for assignment/update). Or use a second let in the case: case(?exists) { let version = exists.version; // inserted let D.print(debug_show(exists.version)); D.print(debug_show(version)); }; Hope that helps! Claudio