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Convert Changeset Into Schema With `apply_changes`

Often times, it's necessary to perform some intermediate operations on a Ecto changeset before saving it to the database. It can be easier to deal with the underlying schema. And you might need the entire schema rather than only the changes in the current changeset.

You can use the apply_changes/1 function to apply that changeset and receive schema with which you can perform operations. It's worth noting that the data is not validated when changes are applied, so care needs to be taken to ensure validity before an attempt to save that record.

iex> lead_schema = Lead.changeset(%{name: "Andrew", email: ""})
                   |> apply_changes() 
%Lead{name: "Andrew", email: ""}

iex> lead_schema |> downcase_email() |> do_some_other_processing()

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