I need to render some form fields by hand in order to meet style
requirements. I am using UpdateView instead of a ModelForm since I just
need a couple of foreign key fields that are already defined on the model,
and I am using html <select> elements to prevent invalid data from being
entered.
I'm running into trouble because when I choose an option and click the
submit button, Django rejects the input and raises a validation error
because the field is required. I know the data should be valid because it
all came straight from the database, but Django appears to be throwing it
away. I can't find UpdateView's clean() methods to try to catch the error
that way. I've tried overriding post() just to see where the problem is
occurring, but the option I chose seemed to just disappear; I don't know
what Django is doing with it or why it thinks its invalid, so I don't know
where to try to catch and fix the problem.
I have two separate html forms with two submit buttons; I separated them
because they seemed easier to style that way, and also because users will
generally need to change one or the other, not both; but two forms might be
the wrong way to go about it. But that doesn't explain why data that came
straight from the database is invalid. They both fail with the same
ValidationErrors (i.e. fields are required).
Thank you for any ideas or insight!
Heather
class Order(models.Model):
order_id = models.IntegerField(primary_key=True)
# (Some additional model fields.)
service_level = models.ForeignKey('manifest.ServiceLevel',
on_delete=models.PROTECT)
priority = models.ForeignKey('fulfillment.Priority',
on_delete=models.PROTECT)
class Priority(models.Model):
"""fulfillment priority levels"""
TYPES = Choices(
('FR', 'FLASH_RUSH', 'Flash Rush'),
('RU', 'RUSH', 'Rush'),
('RG', 'REGULAR', 'Regular'),
)
code = models.CharField(max_length=2, choices=TYPES)
name = models.CharField(max_length=50)
class ServiceLevel(models.Model):
"""levels of service which a carrier provides"""
code = models.CharField(max_length=10, primary_key=True)
name = models.CharField(max_length=50)
# (Some additional model fields.)
class WMSOrderUpdateView(UpdateView):
context_object_name = 'order'
template_name = 'fulfillment/order_detail.html'
fields = ['priority', 'service_level']
def get_context_data(self, **kwargs):
context = super().get_context_data()
context['priorities'] = Priority.objects.all()
context['ship_methods'] = ServiceLevel.objects.all()
return context
<ul class="list-group-flush">
<li class="list-group-item">
<form method="post">
{% csrf_token %}
<label for="priority">
{% if order.priority.code == 'FR' %}
<span class="badge badge-pill badge-danger">
{% elif order.priority.code == 'RU' %}
<span class="badge badge-pill badge-warning">
{% else %}
<span class="badge badge-pill badge-success">
Priority:
{% endif %}
</span>
</label>
<select id="priority" name="change_priority">
{% for priority in priorities %}
<option value="{{ priority.id}}" {% if priority.code ==
order.priority.code %}selected{% endif %}>{{ priority.name }}</option>
{% endfor %}
</select>
<input class="btn btn-primary" type="submit" value="Apply">
</form>
</li>
<li class="list-group-item">
<form method="post">
{% csrf_token %}
<label for="ship_method"><strong>Shipping Method: </strong></label>
<select id="ship_method" name="change_method">
{% for method in ship_methods %}
<option value="{{ method.code }}" {% if method.code ==
order.service_level.code %}selected{% endif %}>{{ method.name|title }}</option>
{% endfor %}
</select>
<input class="btn btn-primary" type="submit" value="Apply">
</form>
</li>
<!-- A few more <li> elements go here, but they're for display only. No
form fields. -->
</ul>
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