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POCatching validation errors in django forms
 

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  1. POCatching validation errors in django forms
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    <p>I have two models:</p> <pre><code>class Studio(models.Model): name = models.CharField("Studio", max_length=30, unique=True) class Film(models.Model): studio = models.ForeignKey(Studio, verbose_name="Studio") name = models.CharField("Film Name", max_length=30, unique=True) </code></pre> <p>I have a Film form that allows the user to either select a preexisting Studio, or type in a new one (with help from an <a href="https://stackoverflow.com/questions/8996451/save-new-foreign-key-with-django-form">earlier question</a>:</p> <pre><code>class FilmForm(forms.ModelForm): required_css_class = 'required' studio = forms.ModelChoiceField(Studio.objects, required=False, widget = SelectWithPlus) new_studio = forms.CharField(max_length=30, required=False, label = "New Studio Name", widget = DeSelectWithX(attrs={'class' : 'hidden_studio_field'})) def __init__(self, *args, **kwargs): super(FilmForm, self).__init__(*args,**kwargs) self.fields['studio'].required = False def clean(self): cleaned_data = self.cleaned_data studio = cleaned_data.get('studio') new_studio = cleaned_data.get('new_studio') if not studio and not new_studio: raise forms.ValidationError("Must specify either Studio or New Studio!") elif not studio: studio, created = Studio.objects.get_or_create(name = new_studio) self.cleaned_data['studio'] = studio return super(FilmForm,self).clean() class Meta: model = Film </code></pre> <p>Now, my first issue is that when both studio and new_studio are missing <strong>I get a django ValueError: Cannot assign None: "Film.studio" does not allow null values error.</strong> I thought I was capturing all the errors, thus django should never get so far as to realize Film.studio is empty. </p> <p>A second issue is an order of operations. <strong>What if I want to only save the new_studio after I'm sure the rest of the FilmForm is valid (thus preventing a bunch of studio names getting saved before full Film entries go through as well)?</strong> Am I in the clear or do I risk premature saving because new_studio's are saved in the form's cleaning?</p> <p><strong>Edit: Added <a href="http://pastebin.com/TTZWbMb4" rel="nofollow noreferrer">Traceback</a> and edited validation if-statements</strong></p>
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    1. COCheck that this line does what you mean: `if studio is None and new_studio == '':`. Could studio be `''` or new_studio be `None`? Does it correctly show the form error if you change that to `if not (studio or new_studio):`?
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    2. COI put a print "here" right before the ValidationError. It came out in the terminal, so I can confirm that the code is reaching that portion. I tried changing the criteria as you suggested and got the same error
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    3. COCan you pastebin the traceback?
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