Multiple update forms for one model - ruby-on-rails

Question

I want to have multiple forms on one page. Let's make an example to understand what I want:
I have a page for my admins, let's say it's the admins#show page. My admin has to change his name on one form on this page and on another form his age. I know I could create one form but I want to have multiple forms (because this is just an example). So my admins#show page looks something like this:
<%= form_for #admin do |a| %>
<%= a.label :name %>
<%= a.text_field :name %>
<%= a.submit "Submit name change" %>
<% end %>
<%= form_for #admin do |e| %>
<%= e.label :age %>
<%= e.number_field :age %>
<%= e.submit "Submit age change" %>
<% end %>
But in my controller, I don't know really how this works and here is my problem. I think I have something like this, but how could I divide the form inputs in the update method?:
def edit
#admin = Admin.find(params[:id])
end
def update
#admin= Admin.find(params[:id])
if #admin.update_attributes(:name=> admin_params1[:name])
redirect_to #admin
else
render 'edit'
end
if #admin.update_attributes(:age=> admin_params2[:age])
redirect_to #admin
else
render 'edit'
end
end
private
def admin_params1
params.require(:admin).permit(:name)
end
def admin_params2
params.require(:admin).permit(:age)
end

Answer 1

Its a bit Unorthodox what you are doing, but as you insisted and only its an example, I guess you can handle the update method by doing like this
def update
#admin= Admin.find(params[:id])
if params[:commit] == "Submit name change"
if #admin.update_attributes(admin_params1)
redirect_to #admin
else
render 'edit'
end
elsif params[:commit] == "Submit age change"
if #admin.update_attributes(admin_params2)
redirect_to #admin
else
render 'edit'
end
end
end
Note: Not Tested!

Answer 2

Well, I think you could create other non-REST methods in the controller and then add named routes in your config/routes then add your two different forms similar to this;
<%= form_for :admin_name, url: admin_name_path, method: :post do |a| %>
<%= a.label :name %>
<%= a.text_field :name %>
<%= a.submit "Submit name change" %>
<% end %>
<%= form_for :admin_age, url: admin_age_path, method: :post do |e| %>
<%= e.label :age %>
<%= e.number_field :age %>
<%= e.submit "Submit age change" %>
<% end %>
Then something like this;
def update_age
#admin = Admin.find(params[:admin_age][:id])
if params[:admin_age]
#admin.update_attributes(:age=> params[:admin_age][:age])
redirect_to #admin
else
render 'edit'
end
end
def update_name
#admin = Admin.find(params[:admin_name][:id])
if params[:admin_name]
#admin.update_attributes(:name=> params[:admin_name][:name])
redirect_to #admin
else
render 'edit'
end
end
** not tested for bugs