Programming Phoenix 1.4

Building Forms

Now that we have a database-backed context, let’s add the ability to create new users in our system. We’re going to use Phoenix’s form builders for that purpose. First, open up your controller at lib/rumbl_web/controllers/user_controller.ex and set up a new user account struct for our new template, like this:

ecto/listings/rumbl/lib/rumbl_web/controllers/user_controller.change1.ex

alias Rumbl.Accounts.User

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

Notice the Accounts.change_user function. This function receives a struct, and returns an Ecto.Changeset. Changesets let Ecto manage record changes, cast parameters, and perform validations. ...