How to save data in rails with no form?

I am new in rails and I am just learning the basics. This is my code on saving data

app/controllers/employee_controller.rb

 class EmployeesController < ApplicationController

    def index
      render json: @employees = Employee.all
    end

    def show
      render json: @employee = Employee.find(params[:id])
    end

    def new
      @employee = Employee.new
    end

    def create
       @employee = Employee.new(employee_params)

      @employee.save
      redirect_to @employee
    end

    private
       def employee_params
         params.require(:employee).permit(:fname, :mname, :lname, :contactno, :address, :username, :password)
       end
 end

app/views/employees/new.html.erb

<%= form_for @employee do |f| %>
<p>
  <label>First Name</label><br>
  <%= f.text_field :fname %>
</p>
<p>
  <label>Middle Name</label><br>
  <%= f.text_field :mname %>
</p>
<p>
  <label>Last Name</label><br>
  <%= f.text_field :lname %>
</p>
<p>
  <label>Contact No.</label><br>
  <%= f.text_field :contactno %>
</p>
<p>
  <label>Address</label><br>
  <%= f.text_area :address %>
</p>
<br>
<p>
  <label>Username</label><br>
  <%= f.text_field :username %>
</p>
<p>
  <label>Password</label><br>
  <%= f.text_field :password %>
</p>
<br>

<p>
  <%= f.submit %>
</p>

But, my goal is to save right away without the html form. (NO INPUT) Like when I visit a certain URL and the values are automatically saved in the database. For a start, I would like to assign a constant value in every field just to see how it works.

Example,

• fname='sample name'


• mname='sampleMidName'


• lname='sampleLastName' and etc...

How can I assign those values right away after a certain URL/site is visited. Can anyone help me? I'd so appreciate your help.