Upserts support

[aerosol]

Options such as on_conflict, conflict_target and returning for upserts are passed down to insert_versions and cause a crash since the target is non existent for the Version schema.

defmodule ExAudit.Test.Repo.Migrations.UniqueConstraint do
  use Ecto.Migration

  def change do
    alter table(:users) do
      add(:unique_field, :string)
    end

    create(unique_index(:users, [:unique_field]))
  end
end

test "on conflict" do
    user = Repo.insert!(%User{name: "Admin", email: "admin@example.com", unique_field: "foo"})
    user2 = %User{name: "Should not change", email: "shouldchange@example.com", unique_field: "foo"}
    # this will crash
    Repo.insert!(user2, on_conflict: {:replace, [:email]}, conflict_target: :unique_field, returning: true)
end

I think it'd require dropping specific opts in insert_versions and introducing a new action type. I haven't figured out yet how to qualify upsert as either update or insert -- the most tricky bit is calculating diffs to support the rollback feature.

[chatamov]

I think the opts sent to Query should be separated from the new opts being added

[chatamov]

All requests with on_conflict fails

[narrowtux]

Oh yeah that's not right, I should implement a whitelist for the options passed to the version recording

[chatamov]

let me know when done, thank you!!

[chatamov]

@narrowtux is there any update?

[narrowtux]

Sorry, I'm very swamped at work

[narrowtux]

@bruteforcecat fixed this.

Update to 0.7