I created a custom controller with an action to download files that are automatically generated, the problem I am facing currently is how to link to this controller in the view without using a form tag (as the place of the link/button where I want it is already inside a form view), bellow is my controller:

class MyController(http.Controller):
  _cp_path = '/sc'

  @http.httprequest
  def some_html(self, req, s_action=None, **kw):
    return req.make_response(open('path_of_file').read(),
           [('Content-Type', 'application/octet-stream; charset=binary'),
           ('Content-Disposition', content_disposition('1.docx', req))],
        )

Bellow is the xml view and where I want to place the link to the url to download the given docx (please note it is not a static file it's auto-generated):

<record model="ir.ui.view" id="view_sefarer_applicant_form">
    ....
    <field name="arch" type="xml">
      <form string="Jobs - Recruitment Form" version="7.0">
      .....
        <sheet>
          <div class="oe_right oe_button_box">
            ...
            <button name="action_download_form" type="object" string="P014 Drug/Alcohol Delcaration" attrs="{'invisible':[('state','!=','done')]}"/>#this is where the link to the download url {sc/some_html} should be called
            ...
        </sheet>
      </form>

    </field>
</record>

Any help or suggestions would be appreciated.