rails updating multiple rows in single form - ruby-on-rails-4

Question

i have a table with set of students, I want update attendance column to all the students with different values using single form which will save all the record.
note: i was able to save all the records individually.
here is my edit page
<table>
<thead>
<tr>
<th>Name</th>
<th>user_id</th>
<th>Present days</th>
<th>Total days</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% #attendancce.each do |userr| %>
<tr>
<%= form_for(userr) do |f| %>
<td><%=userr.user.name %></td>
<td><%= userr.user_id %></td>
<td><%= f.number_field :present_days %></td>
<td><%= f.number_field :total_days %></td>
<td><%= f.submit %></td>
<% end %>
</tr>
<% end %>
</tbody>
</table>
<%= submit_tag "submit" %>
and below is my method for updating the records
def update
#attendancce = Attendance.all
respond_to do |format|
if #attendance.update(attendance_params)
format.html { redirect_to #attendance, notice: 'Attendance was successfully updated.' }
format.json { render :show, status: :ok, location: #attendance }
else
format.html { render :edit }
format.json { render json: #attendance.errors, status: :unprocessable_entity }
end
end
end
please suggest how to achieve my target