Selectively force loading associations in Ecto.Repo.preload()

Questions / Help
1

Hey!

Small question about Ecto.Repo.preload(). I was trying to do something like this:

    updated_post =
      changeset
      |> Repo.update!()
      |> Repo.preload(
        comments: from(c in Comments, where: is_nil(c.some_field)), force: true
      )

But I get “schema … does not have association :force” error.

Seems like I can only either do:

 Repo.preload(
        comments: from(c in Comments, where: is_nil(c.some_field))
 )

or

 Repo.preload(
        :comments, force: true
  )

If I use the first option I have some missing comment associations but the second option contains associations that I don’t want to have included.

Would it be possible somehow to combine those two into one preload statement (from(…) and force flag)?

2

When using both parameters you need to add the square brackets for the non-last parameter.

1 Like
3

Thanks a lot! That worked.