#User.rb :-

accepts_nested_attributes_for :address

#The view

<%= simple_form_for @user do |f|%>
 <%= f.input :name %>
 <%= f.input :email %>
 <%= f.simple_fields_for :address do |f2|%>
    <%= f2.input :street %>
    <%= f2.input :city %>
 <% end %>
 <%=f.submit%>
<% end %>


# Controller
def new
    @user = User.new
    @user.build_school
end

private

def user_params
    params.require(:user).permit(:email,:school_attributes[:name])
end