Questions & Help>Questions

Validate_inclusion with dynamic enum

/phoenix#ecto#validation
RomainT

RomainT

Hello,

I want to validates a value among possible values with validate_inclusion but I’m stuck.

My use case is an avatar generation system, layer by layer. An avatar is defined by a pack (Dragon Ball, Among Us…) and many layers (body, hat, pants…). Let’s say that you chose the Dragon ball pack that only has 3 bodies while the Among Us pack has 10. I need the enum argument of validates_inclusion(:body, enum) to depend on the pack.

Is it possible? How could I implement that?

Thanks!

4 comments
/phoenix#ecto#validation
449 4

Marked As Solved

lud

lud

I dont think the enum has to be static. I think you can pass any valid enumerable.

So something like that should work:

  def changeset(changeset) do
    changeset
    |> cast(...)
    |> validate_required(...)
    |> validate_parts()
  end

  defp validate_parts(changeset) do
    pack = fetch_field!(changeset, :pack)
    
    changeset
    |> validate_inclusion(:body, Packs.parts_for(pack, :body))
    |> validate_inclusion(:pants, Packs.parts_for(pack, :pants))
  end
1
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RomainT

RomainT OP

It works pefectly, thanks!

1
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