Hi,
The choice between doing a custom manipulator from scratch or using
the automatically generated one depends on many factors. In an
application that I am writing I used a custom manipulator because I
needed to create several different objects (from different models) in
one single step. So instead of mixing several manipulators and
FormWrappers, I created a single custom manipulator and that made
things a lot easier.
But in other parts of this same application, where I only needed to
add or change a single model, I used the default manipulators.
On 7/3/06, Todd O'Bryan <[EMAIL PROTECTED]> wrote:
> MultipleSelectField to only certain items. Another one needs to be
> set to a particular item and the user not given a choice to change it.
If you want to use the default manipulator but you do not want the
user to be able to change all the fields you can do something like
this:
def add_object_view(request):
manipulator = MyModel.AddManipulator()
new_data = {}
errors = {}
if request.POST:
new_data = request.POST.copy()
# The user cannot supply the following value so it's hard coded here.
new_data['special_value'] = 'The user didn't entered this!'
errors = manipulator.get_validation_errors(new_data)
if not errors:
manipulator.do_html2python(new_data)
new_obj = manipulator.save(new_data)
return HttpResponseRedirect('/some/url/view/here/')
else:
# No post, fill up default values
new_data['some_field'] = 'default value'
form = form.FormWrapper(manipulator, new_data, errors)
return render_to_response('some_template.html', {'form': form})
Note that you need to insert the hard coded (or computed) values
before the call to get_validation_errors() because otherwise you would
get an error about them being required (if they are). Also note that
all the fields in new_data MUST be strings before calling
get_validation_errors(). So that if you want to insert the current
time in a date field you would need to do something like this:
new_data['date'] = datetime.now().strftime('%Y-%m-%d')
and for a ForeignKey:
related_object = OtherObject.objects.get(pk=23)
new_data['related_object'] = str(related_object.id)
If you want to use an automatic manipulator but want to only restrict
the selections in a select list you could subclass the manipulator
like this:
class MyCustomManipulator(MyModel.AddManipulator):
def __init__(self):
MyModel.AddManipulator.__init__(self)
for field in self.fields:
if field.field_name == 'related_object':
choices = [(obj.id, obj) for obj in
RelatedObject.objects.filter(somecriteria)]
field.choices = choices
Cheers,
Jorge
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