How do I iterate over the options of a SelectField in a template?

I’ve been struggling with this problem today and found the solution. Yes, you can iterate over options of the select tag directly in template. Here’s how to do it in template:

<select id="id_customer" name="customer">
{% for x, y in form.fields.customer.choices %}
    <option value="{{ x }}"{% if form.fields.customer.value == x %} selected{% endif %}>{{ y }}</option>
{% endfor %}
</select>

In this case I have a customer field in the form which has choices set up as follows:

class SomeForm(forms.Form):
    customer = forms.ChoiceField(label=u'Customer')

    def __init__(self, *args, **kwargs):
        super(SomeForm, self).__init__(*args, **kwargs)
        self.fields['customer'].choices = [(e.id, e.customer) for e in Customers.objects.all()]