I have the following Snippet code :

    <template id="snippet_colact_id" name="ColAct snippet">
      <section class="oe_snippet_body snippet_colact_id">
            <h3>Actions</h3>
            <div t-esc="res_company.textHarvey()"/>          
            <div t-set="teachers" t-value="res_company.menusHarvey()"/>
            <t t-foreach="teachers" t-as="teacher">
              <p><t t-esc="teacher.id"/> <t t-esc="teacher.name"/></p>
            </t>
      </section>
    </template>


class res_company(models.Model):
  def textHarvey(req):
    return "hello harvey"
  def menusHarvey(req):
    id_colacts = openerp.pooler.get_pool(http.request.cr.dbname).get('a_colact_collaborativeaction').search(http.request.cr, http.request.uid, [])
    colacts = openerp.pooler.get_pool(http.request.cr.dbname).get('a_colact_collaborativeaction').browse(http.request.cr, http.request.uid, id_colacts)
    return colacts

When I drag my snippet onto the page the values are correctly extracted from the DB, but when I later change the values in Odoo and then refersh the page the values don't change. It looks like the values are retrieved when the Snippet is dropped onto the page and that they never change after?