how to post checkboxes array based on check and uncheck checkboxes ruby on rails

I have array of checkboxes from which I need to store data row by row in the database.

Scenario is if user mark checkboxes the database should store value of is_present check as true and the information of that respective user as well.

If user mark uncheck, the database should store value of is_present check as false and the information of that respective user as well.

My main issue is I am unable to post both true and false at a time. I am only having true in params but unable to get false and its respective user information.

Also I am unable to see true or false belongs to which user in params.

I am also trying fields_for with it.

also how I can store them as row by row in database from params?

So, final words are, I have attendance table in which in the start there are no records but I am showing student registrations from some other table and I wants to tick or untick users from registrations table and have this information store in attendance table.

If tick marked then is_present as true and information of that user, if tick unmarked then is_present as false and information of that user.

The checkboxes could be 100+ so I created array of checkboxes.

Here is my code:

<%= form_for ([:teacher, @teacher, @class_room, @subject, @lesson, @attendance]) do |f| %>
          <table id class="table table-bordered table-sm">
            <thead>
            <tr>
              <th width="30%">Mark Attendance</th>
              <th width="30%">Student</th>
              <th width="30%">Grades</th>
            </tr>
            </thead>
            <tbody id="class_room_attendances">
            <% @class_room_registrations.each do |class_room_registration| %>
                <tr>
                  <td>
                    <%= f.check_box "is_present", {}, true, false %>
                    <label>Check / Uncheck To Mark Attendance</label>
                  </td>
                  <%= f.fields_for :class_room_registrations, class_room_registration do |class_room_registration_fields| %>
                      <%= class_room_registration_fields.hidden_field :user_id, value: class_room_registration.user_id %>
                      <%= class_room_registration_fields.hidden_field :student_id, value: class_room_registration.student_id %>
                  <% end %>
                </tr>
            <% end %>

            </tbody>
          </table>
          <div class="form-group">
            <%= submit_tag 'Mark Attendance', class: 'btn btn-lg btn-info' %>
          </div>
      <% end %>

Create code:

def create
    @attendance = @lesson.attendances.new(attendance_params)
    flash[:notice] = "Attendance marked successfully"
    respond_to do |format|
      if @attendance.save
        format.html { redirect_to teacher_teacher_class_room_subject_lessons_path(@teacher, @class_room, @subject) }
        format.json { head :no_content }
        format.js
      end
    end
  end

Params are:

{"utf8"=>"✓", 
"authenticity_token"=>"dy3eO7sNEBM+NV0Wwu08l/cIfoJp2VRJr06VW9B75K8Ru8s+q367vna
PK+6sCOxN1ICfcUYhLUaZ71HRI71C5g==", "attendance"=>{"is_present"=>"true", 
"class_room_registrations"=>{"user_id"=>"5", "student_id"=>"1"}}, 
"commit"=>"Mark Attendance", "controller"=>"teacher/attendances", 
"action"=>"create", "teacher_id"=>"delfina-kozey", "class_room_id"=>"15", 
"subject_id"=>"4", "lesson_id"=>"25"}

Generated HTML:

<form class="new_attendance" id="new_attendance" action="/teacher/delfina-kozey/class_rooms/15/subjects/4/lessons/25/attendances" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓"><input type="hidden" name="authenticity_token" value="E2hKfNCGUePkmp5TLfr43rYW/3RP6znEekYHjxs5dMJ1/l95wPX6Tqwg6KtDHygElZ4eh2ATQMtM58MF6P/Siw==">
          <table id="" class="table table-bordered table-sm">
            <thead>
            <tr>
              <th width="30%">Mark Attendance</th>
            </tr>
            </thead>
            <tbody id="class_room_attendances">
                <tr>
                  <td>
                    <input type="checkbox" value="true" checked="checked" name="attendance[is_present]" id="attendance_is_present">
                    <label>Check / Uncheck To Mark Attendance</label>
                  </td>

                      <input value="6" type="hidden" name="attendance[class_room_registrations][user_id]" id="attendance_class_room_registrations_user_id">
                      <input value="2" type="hidden" name="attendance[class_room_registrations][student_id]" id="attendance_class_room_registrations_student_id">
                </tr>
                <tr>
                  <td>
                    <input type="checkbox" value="true" checked="checked" name="attendance[is_present]" id="attendance_is_present">
                    <label>Check / Uncheck To Mark Attendance</label>
                  </td>

                      <input value="5" type="hidden" name="attendance[class_room_registrations][user_id]" id="attendance_class_room_registrations_user_id">
                      <input value="1" type="hidden" name="attendance[class_room_registrations][student_id]" id="attendance_class_room_registrations_student_id">
                </tr>

            </tbody>
          </table>
          <div class="form-group">
            <input type="submit" name="commit" value="Mark Attendance" class="btn btn-lg btn-info">
          </div>
</form>

Form Screenshot: