Is it possible to use embed schema with a map?

Questions / Help
1

With @spec you can define the the values of a map to be a certain type.

Is it possible to embed Ecto schema that describe a value inside a map? Or even deeper relationships?
For example, I want to store data that looks something like this:

%{
   countries: [
      %{code: "ab"},
      %{code: "cd"},
      # ...
   ]
}

where the members of the array can be described by an embedded schema? This looks maybe crazy, but it is not for relational database, so the nesting is more deep.

2

You can use struct but if you want to validate the fields, embedded_schema may suit your need

embedded_schema/1 is used for defining schemas that are embedded in other schemas or only exist in-memory. For example, you can use such schemas to receive data from a command line interface and validate it, without ever persisting it elsewhere.

defmodule Country do
  use Ecto.Schema

  embedded_schema do
    field :code, :string
  end
end
3

yes, but I cannot find the syntax for doing this when it is the value of a map (the keys are arbitrary strings). Sorry I am probably explaining this bad

4

Perhaps this could help: Ecto.Schema — Ecto v3.5.6.