In a project I’m working in, I have to create a boatload of different structs, each containing a list of different types of objects. Think XML with types. The values cannot be set directly on fields because order must be preserved, so there is no explicit type spec on the struct (it has one field th…

Example: defmodule Nav do def a, do: key(:a, []) def c, do: key(:c, []) def some, do: key(:some, []) defp key(key, default) do fn :get, data, next -> next.(Keyword.get(data, key, default)) :get_and_update, data, next -> value = Keyword.get(dat…

Here is some (writing from memory with a phone keyboard): defmodule A do defstruct values: [] @element name: "a", type: A, min_occurs: 0 @element name: "b", type: B, max_occurs: 5 @element name: "c", type: C # implementations of Access and Enumerable def fetch(a, key) when is_atom(ke…

[image] saverio-kantox: creating the intermediate steps as needed This involves using functions-as-keys in the path list that know what empty struct to supply when one is needed. Access.keys/2 does this for Maps and structs. Use its implementation https://github.com/elixir-lang/elixir/blob/…

Very interesting, I haven’t thought about it. So the user instead of providing just the key path, would provide something like put_in(thing_a, [ MyAccess.key_or_create(:a), MyAccess.key_or_create(:c), … ], "value") and the functions will be created based on some protocol that I need to defin…

Elixir Programming Language Forum

Access on structs with typed members

Questions & Help Questions

dimitarvp May 21, 2019, 7:39pm 2

Some examples will help a lot, want to post some?