Question

When I go to the edit_user_registration_path provided by Devise I have fields such as email and username pre-filled.

I want to create custom user profile page with the similar form for edit user information containing additional fields of dependent model. And I want fields be pre-filled.
How should I do it properly?

The default form provided by Devise:

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), :html => { :method => :put }) do |f| %>
  <%= devise_error_messages! %>

  <div><%= f.label :email %><br />
  <%= f.email_field :email %></div>

  <div><%= f.label :username %><br />
  <%= f.text_field :username %></div>

  <div><%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
  <%= f.password_field :password, :autocomplete => "off" %></div>

  <div><%= f.label :password_confirmation %><br />
  <%= f.password_field :password_confirmation %></div>

  <div><%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i><br />
  <%= f.password_field :current_password %></div>

  <div><%= f.submit "Update" %></div>
<% end %>

Answer 1

Use nested attributes

In your devise user model, if you have other dependent models, you can add a relationship between those models, like has_many and belongs_to. The do this:

Devise user model:

accepts_nested_attributes_for :name_of_other_model

Then in your form you can use fields_for. fields_for docs

Here’s also a great railscast of this here