how to get text_field value in a variable in rails

Hi I am new in ruby on rials, i want to get text_field value in a variable then this variable value send to MySql query and form_for using bootstrap model

I am sending the code please tell me where am i wrong..... thanks

this is edit button click on then call bootstrap model "#examplemodel1"

<div class="edit-recr-wrp1">  
   <button type="button" class="btn btn-primary fa fa-pencil-square-o" data-toggle="modal" data-target="#exampleModal1" data-whatever="<%= emp['offer_letter_id'] %>"></button> 
</div>

this is my "#examplemodel1" call from above button

<div class="modal fade" id="exampleModal1" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  </div>
  <div class="modal-body">
    <div class="post-new-job head-border">
        <div class="form-body"> 
            <!-- edit employee information -->
            <div class="mydata1">
        <%= text_field :ol_id, { class: 'form-control', id: 'recipient-name' } %>
            </div>

            <%= form_for :employee_details, url: hr_path(:ol_id), method: :patch  do |f| %>             
                <div class="col-md-12">

                 <div class="mydata">
                   <%= f.hidden_field :offer_letter_id, { class: 'form-control', id: 'recipient-name' } %>
                 </div>

                 <div class="form-group">
                    <label class="control-label">Employee ID</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-user"></i> </span>
                      <%= f.text_field :employee_id, { :required => true, placeholder: 'E12345678', class: 'form-control' } %>
                    </div>
                  </div>

                  <div class="form-group">
                    <label class="control-label">Bank Account</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-university"></i> </span>
                      <%= f.text_field :bank_ac, { :required => true, placeholder: '06464060852634865', class: 'form-control' } %>
                    </div>
                  </div>

                  <div class="form-group">
                    <label class="control-label">Bank IFSC Code</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-code"></i> </span>
                      <%= f.text_field :bank_ifsc, { :required => true,  placeholder: 'SBI012356', class: 'form-control' } %>
                    </div>
                  </div>

                 <div class="form-group">
                    <label class="control-label">End of Date</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-calendar"></i> </span>
                      <%= f.text_field :work_end_date, {  placeholder: 'MM/DD/YYYY', id: 'datepicker1', class:"datepicker_style" } %>
                    </div>
                  </div>

                  <div class="form-group">
                    <label class="control-label">Gender</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-male fa-female"></i> </span>
                      <%= f.select :gender, ['Male', 'Female'], { :required => true }, class: "form-control" %>
                    </div> 
                  </div>

                  <div class="form-group">
                    <label class="control-label">Spouse Name</label>
                    <div class="input-group"> <span class="input-group-addon"> <i class="fa fa-user"></i> </span>
                      <%= f.text_field :spouse_name, { :required => true, placeholder: 'Father/Mother/Wife name', class: "form-control" } %>
                    </div>
                  </div> <br>

                  <div class="form-group">
                    <a><%= f.submit "Edit Employee Details", :class => "btn btn-primary" %></a> 
                  </div>
                </div>
                <div class="col-md-2"></div>                
            <%- end -%>
        </div>      
    </div>
   </div>
</div>

this is my jquery code

<script type="text/javascript">
    $('#exampleModal1').on('show.bs.modal', function (event) {
      var button = $(event.relatedTarget)
      var recipient = button.data('whatever')
      var modal = $(this)
      modal.find('.mydata1 input').val(recipient)
    });
</script>

In this model offer_letter_id display into text_field:old_id

<div class="mydata1">
    <%= text_field :ol_id, { class: 'form-control', id: 'recipient-name' } %>
</div>

But I can not take this value in a variable. I want to pass this value in url: hr_path(variable value)

<%= form_for :employee_details, url: hr_path(:ol_id), method: :patch  do |f| %>