title: Django FilterSet set initial value
body: <p>We are using Django_Filterset in our project. I have been asked to set a default filter value for a foreign key column in the model</p>
  
  <pre><code>class RegFilter(django_filters.FilterSet):
  
      class Meta:
          model = models.Reg
          fields = {
            'id': ['exact'],
            'nom_id': ['icontains'],
            'nom_name': ['icontains'],
            'product__name': ['icontains']
          }
  </code></pre>
  
  <p>The product name should default to a product already in the db when the initial screen is displayed - any idea how this can be achieved? Appreciate your help.</p>