CODEWITHSUNDEEP
elixirecto
Arjun Singh
Arjun Singh

Reputation: 697

How to store module name in db elixir/ecto

I have a use-case where I want to store module_name in my DB(Postgres). I am doing this so that later on I can retrieve the name and call a function defined inside the module. e.g.

defmodule A do
  def a() do
  end 
end

Suppose I have a schema "xyz" I want to keep a field module name in it, 

schema "xyz" do
  field(:module, Ecto.Atom)
end

For now, I have kept the field to be Ecto.Atom type.

Is it correct, if not what's the right way to do it?

Upvotes: 0

Views: 404

Answers (1)

Dogbert
Dogbert

Reputation: 222358

You can use apply/3 to call a function on a module whose name you have as an atom.

Let's say you have Enum atom stored in xyz with id 123. You can call Enum.map([1, 2, 3], &(&1 * &1)) like this:

xyz = Repo.get(Xyz, 123)
apply(xyz.module, :map, [[1, 2, 3], &(&1 * &1)]) #=> [1, 4, 9]

Upvotes: 1

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