CODEWITHSUNDEEP
elixirphoenix-framework
wintermeyer
wintermeyer

Reputation: 8318

nested form for has_many association

A User has_many emails. How can I create a new User and have a single new Email nested in the form?

user_controller.ex

[...]
def new(conn, _params) do
  changeset = User.changeset(%User{})
  render(conn, "new.html", changeset: changeset)
end
[...]

form.html.eex

[...]
<%= inputs_for f, :emails, fn ef -> %>
  <div class="form-group">
    <%= label ef, :value, class: "control-label" %>
    <%= text_input ef, :value, class: "form-control" %>
    <%= error_tag ef, :value %>
  </div>
<% end %>
[...]

There are a couple of Stackoverflow questions about this but none fixes this simple problem.

Upvotes: 2

Views: 484

Answers (1)

Dogbert
Dogbert

Reputation: 222040

In the controller, use Ecto.Changeset.put_assoc/4:

alias MyApp.Email

[...]

changeset =
  User.changeset(%User{})
  |> Ecto.Changeset.put_assoc(:emails, [%Email{}])
render(conn, "new.html", changeset: changeset)

This will create one empty %Email with default values and put it in the :emails association of the changeset.

Upvotes: 3

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