Adding value in 2 tables

Are these fields in a database or in an html <table>? If it’s the former, use a transaction or a multi.

In my case,
it’s in a database

Then you can use a transaction or a multi.

With transaction:

Repo.transaction(fn ->
  # insert in tel_cf
  # insert in table2_tel_cf
end)

With multi:

alias Ecto.Multi

Multi.new()
|> Multi.insert(:tel_cf, tel_cf_changeset)
|> Multi.insert(:table2_tel_cf, table2_tel_cf_changeset)
|> Repo.transaction()

I believe you are saying there is only one field that you want to record in two different tables. That would mean the template is probably not the right place to do this. Like @idi527 said, transaction or multi would be what you want. As to where to put it, if you are using phoenix contexts, it would go in the one that contains the schema you are updating. If you’re not using contexts, you would probably put it in your controller.

Thank you very much.
That was it.
I was able to insert the field using multi.