Rails - Editing User and Profile Models from separ

Question

I'm struggling to figure out exactly how to get this to work, but essentially I have 2 models:

 class User
 class Profile

One User has One Profile.

I also have a SettingsController with "profile" and "update" actions:

class SettingsController < ApplicationController

  def profile
    @profile = User.find_by_id(current_user).profile
  end

  def update
    set_profile
    respond_to do |format|
      if @profile.update(profile_params)
        format.html { redirect_to @profile, notice: 'Profile was successfully updated.' }
      else
        format.html { render :edit }
      end
    end
  end

  private
    def profile_params
      params.require(:profile).permit(:name)
    end

end

And the /settings/profile page:

<h1>Settings</h1>
<div>

  <div>
    Name: <%= @profile.name %>
  </div>
  <%= form_with(model: @profile, local: true) do |form| %>

    <div class="field">
      <%= form.label :username %> 
      <%= form.text_field :username %>
    </div>

    <div class="field">
      <%= form.label :surname %> 
      <%= form.text_field :surname %>
    </div>

    <div class="actions">
      <%= form.submit %>
    </div>
  <% end %>

</div>

My routes:

get 'settings/profile', to: 'settings#profile', as: :settings_profile
post 'settings/profile', to: 'settings#update', as: :update_settings_profile

How can I get my form (from SettingsController) to allow fields for my User and Profile models?

*Edit

I have overridden my profile_path to pull from the username:

def profile_path(profile)
  '/' + 'profiles' + '/' + profile.user.username
end

Currently, when I load the page containing the form, I get this error:

wrong number of arguments (given 2, expected 1)

Answer 1

When you define the form as <%= form_with(model: @profile, local: true) do |form| %>, it is equivalent to <form action="/profiles/1" method="post" data-remote="false">. You need to tell Rails to map the form to the custom url like so

<%= form_with(model: @profile, url: update_settings_profile_path, local: true)

And you need to whitelist username and surname in the profile_params in order to reflect the changes in the DB.

def profile_params
  params.require(:profile).permit(:username, surname)
end