Validate that an `embeds_many` field is present in the changeset

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2

In fact, :bars is defined:

> %Foo{}

%Foo{
  __meta__: #Ecto.Schema.Metadata<:built, "foo">,
  bars: [],
  id: nil,
  name: nil
}

So I don’t get why %Foo{} |> Shipfixcore.Repo.insert produces a:

** (Postgrex.Error) ERROR 23502 (not_null_violation) null value in column "bars" violates not-null constraint

    table: foo
    column: bars

But I guess it has nothing to do with embeds_many.

Edit:
I opened an other thread to get help for the underlying issue: How to persist an empty list in a `jsonb` column?
Maybe this one should be closed?