Rails - Submitting multiple forms with one submit button - html

Question

In my application I have a page for editing all users however I would like it so that I only have to click one submit button to update the users' details but at the moment I can only edit one and click the 'Update User' button to change that one user's details.
_form.html.erb
<%= form_tag edit_user_path do |form| %>
<% #users.each do |user| %>
<%= form_for user do |f| %>
<% if #user.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#user.errors.count, "error") %> prohibited this user from being saved:</h2>
<ul>
<% #user.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :username %><br>
<%= f.text_field :username %>
</div>
<div class="field">
<%= f.label :sunday %><br>
<%= f.text_field :sunday %>
</div>
<div class="field">
<%= f.label :monday %><br>
<%= f.text_field :monday %>
</div>
<div class="field">
<%= f.label :tuesday %><br>
<%= f.text_field :tuesday %>
</div>
<div class="field">
<%= f.label :wednesday %><br>
<%= f.text_field :wednesday %>
</div>
<div class="field">
<%= f.label :thursday %><br>
<%= f.text_field :thursday %>
</div>
<div class="field">
<%= f.label :friday %><br>
<%= f.text_field :friday %>
</div>
<div class="field">
<%= f.label :saturday %><br>
<%= f.text_field :saturday %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<% end %>
<%= submit_tag "Submit" %>
<% end %>
As you can see that submit_tag at the bottom of the code does absolutely nothing however I would like it to update all the users' details. Any help would be greatly appreciated!

Answer 1

Against:
<%= form_for user do |f| %>
use:
<%= fields_for "users[]", user do |f| %>
After that you will get in the controller parameters values for each user_id:
"users"=>{"user_id1"=>{"attr1"=>"value1"}, "user_id2"=>{"attr1"=>"value1"}
Also to make possible updating a collection of object a way to do it is to add an action to the UsersController like this:
def update_collection
# Update users here
end
and update routing in config/routes.rb:
resources :users do
collection do
match 'update_collection', via: [:put, :patch]
end
end
and use proper url in the main form:
<%= form_tag update_collection_users_path, method: :put do |form| %>