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Medium Article: Building Many-To-Many Associations with Embedded Schemas in Ecto and Phoenix
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defmodule App.RegistrationController do | |
use App.Web, :controller | |
alias App.{Registration, Repo} | |
def new(conn, _params) do | |
changeset = Registration.changeset(%Registration{}) | |
render conn, :new, changeset: changeset | |
end | |
def create(conn, %{"registration" => registration_params}) do | |
changeset = Registration.changeset(%Registration{}, registration_params) | |
if changeset.valid? do | |
case Repo.transaction(Registration.to_multi(registration_params)) do | |
{:ok, _} -> | |
redirect conn, to: registration_path(conn, :new) | |
{:error, _operation, repo_changeset, _changes} -> | |
changeset = copy_errors(repo_changeset, changeset) | |
render conn, :new, changeset: %{changeset | action: :insert} | |
end | |
else | |
render conn, :new, changeset: %{changeset | action: :insert} | |
end | |
end | |
defp copy_errors(from, to) do | |
Enum.reduce from.errors, to, fn {field, {msg, additional}}, acc -> | |
Ecto.Changeset.add_error(acc, field, msg, additional: additional) | |
end | |
end | |
end |
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