OK...I have the following model and form.
*class CmdString(models.Model):
name = models.CharField(max_length=50)
cmd = models.CharField(max_length=200)
eda_app = models.OneToOneField(EDA_App, primary_key=True)
def __unicode__(self):
return self.cmd *
*class EDA_AppSelectForm(forms.Form):
app_cmds = forms.ChoiceField(choices=CmdString.objects.all())*
When I execute in a Python shell the command *CmdString.objects.all() *I
have the following output from my database:
*[<CmdString: vcs -a -b -f $FILE1>, <CmdString: vhdlan -c -d -f $FILE2>,
<CmdString: virsim -c -d -f $FILE2>, <CmdString: virt1 -a -b -f $FILE1>,
<CmdString: virt2 -c -d -f $FILE2>, <CmdString: virt3 -c -d -f $FILE2>,
<CmdString: virt4 -c -d -f $FILE2>, <CmdString: quartz1 -c -d -f
$FILE2>, <CmdString: quartz2 -c -d -f $FILE2>, <CmdString: quartz3 -a -b
-f $FILE1>, <CmdString: quartz4 -c -d -f $FILE2>, <CmdString: vcs -a -b
-f $FILE1>, <CmdString: vhdlan -c -d -f $FILE2>, <CmdString: virsim -c
-d -f $FILE2>, <CmdString: virt1 -a -b -f $FILE1>, <CmdString: virt2 -c
-d -f $FILE2>, <CmdString: virt3 -c -d -f $FILE2>, <CmdString: virt4 -c
-d -f $FILE2>, <CmdString: quartz1 -c -d -f $FILE2>, <CmdString: quartz2
-c -d -f $FILE2>, '...(remaining elements truncated)...']*
This is a Python list with each element of the list a dictionary
object. This list is iterable, i.e.
*for cmd in CmdString.objects.all():
... print cmd*
will return:
*vcs -a -b -f $FILE1
vhdlan -c -d -f $FILE2
virsim -c -d -f $FILE2
virt1 -a -b -f $FILE1
virt2 -c -d -f $FILE2
virt3 -c -d -f $FILE2
virt4 -c -d -f $FILE2
quartz1 -c -d -f $FILE2
quartz2 -c -d -f $FILE2
quartz3 -a -b -f $FILE1
quartz4 -c -d -f $FILE2
vcs -a -b -f $FILE1
vhdlan -c -d -f $FILE2
virsim -c -d -f $FILE2
virt1 -a -b -f $FILE1
virt2 -c -d -f $FILE2
virt3 -c -d -f $FILE2
virt4 -c -d -f $FILE2
quartz1 -c -d -f $FILE2
quartz2 -c -d -f $FILE2
quartz3 -a -b -f $FILE1
quartz4 -c -d -f $FILE2*
Perfect...I'm happy with this output.
Now, I wanted to take a look at the output of the form to be rendered as
HTML. I'm looking for the "select" tag with the options to be output
from the "choices" kwarg.
When I to take a look at an instance of this form with "as_p", I get the
following error:
*>>> samp2 = EDA_AppSelectForm()
>>> type(samp2)
<class 'tss_cloud.forms.EDA_AppSelectForm'>
*
*>>> samp2.as_p()
>>> Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 235, in as_p
errors_on_separate_row = True)
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 180, in _html_output
'field': unicode(bf),
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 408, in __unicode__
return self.as_widget()
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 439, in as_widget
return widget.render(name, self.value(), attrs=attrs)
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/widgets.py",
line 516, in render
options = self.render_options(choices, [value])
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/widgets.py",
line 533, in render_options
for option_value, option_label in chain(self.choices, choices):
TypeError: 'CmdString' object is not iterable
>>> print samp2.as_p()
>>> Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 235, in as_p
errors_on_separate_row = True)
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 180, in _html_output
'field': unicode(bf),
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 408, in __unicode__
return self.as_widget()
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/forms.py",
line 439, in as_widget
return widget.render(name, self.value(), attrs=attrs)
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/widgets.py",
line 516, in render
options = self.render_options(choices, [value])
File
"/home/jmarcedwards/foobarr/local/lib/python2.7/site-packages/django/forms/widgets.py",
line 533, in render_options
for option_value, option_label in chain(self.choices, choices):
TypeError: 'CmdString' object is not iterable*
What is happening here? When I remove the "choices" kwarg in the
"app_cmds" form field, I can print out the HTML, and the "select" field
is there as expected, but I have no choices/options in the HTML. This is
why I was trying to use the "choices" attribute.
Now the documentation for the "choices" kwarg is pasted below, which
says that this should be an iterable of 2-tuples, but seems to indicate
it could be a list as well. The documentation here seems unclear, i.e
an iterable of tuple of 2-tuples, I don't think it means this.
How can I achieve what I am looking for here?
> choices
> An iterable _/(e.g., a list or tuple) /_of 2-tuples to use as choices
> for this field. This argument accepts the
> same formats as the choices argument to a model field. See the model
> field reference documentation on
> choices for more details.
Regards, Marc
--
J. Marc Edwards
Lead Architect - Semiconductor Design Portals
Nimbis Services, Inc.
Skype: (919) 747-3775
Cell: (919) 345-1021
Fax: (919) 882-8602
[email protected]
www.nimbisservices.com
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