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PODjango custom form field initial data
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  1. PODjango custom form field initial data
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    copied!<p>I am having trouble understanding how to initialize a custom form field in a django view. </p> <p>For example: <a href="http://djangosnippets.org/snippets/907/" rel="noreferrer">http://djangosnippets.org/snippets/907/</a></p> <pre><code>from datetime import date, datetime from calendar import monthrange class CreditCardField(forms.IntegerField): @staticmethod def get_cc_type(number): number = str(number) #group checking by ascending length of number if len(number) == 13: if number[0] == "4": return "Visa" return "Unknown" def clean(self, value): if value and (len(value) &lt; 13 or len(value) &gt; 16): raise forms.ValidationError("Please enter in a valid "+\ "credit card number.") elif self.get_cc_type(value) not in ("Visa", "MasterCard", "American Express"): raise forms.ValidationError("Please enter in a Visa, "+\ "Master Card, or American Express credit card number.") return super(CreditCardField, self).clean(value) class CCExpWidget(forms.MultiWidget): """ Widget containing two select boxes for selecting the month and year""" def decompress(self, value): return [value.month, value.year] if value else [None, None] def format_output(self, rendered_widgets): html = u' / '.join(rendered_widgets) return u'&lt;span style="white-space: nowrap"&gt;%s&lt;/span&gt;' % html class CCExpField(forms.MultiValueField): EXP_MONTH = [(x, x) for x in xrange(1, 13)] EXP_YEAR = [(x, x) for x in xrange(date.today().year, date.today().year + 15)] default_error_messages = { 'invalid_month': u'Enter a valid month.', 'invalid_year': u'Enter a valid year.', } def __init__(self, *args, **kwargs): errors = self.default_error_messages.copy() if 'error_messages' in kwargs: errors.update(kwargs['error_messages']) fields = ( forms.ChoiceField(choices=self.EXP_MONTH, error_messages={'invalid': errors['invalid_month']}), forms.ChoiceField(choices=self.EXP_YEAR, error_messages={'invalid': errors['invalid_year']}), ) super(CCExpField, self).__init__(fields, *args, **kwargs) self.widget = CCExpWidget(widgets = [fields[0].widget, fields[1].widget]) def clean(self, value): exp = super(CCExpField, self).clean(value) if date.today() &gt; exp: raise forms.ValidationError( "The expiration date you entered is in the past.") return exp def compress(self, data_list): if data_list: if data_list[1] in forms.fields.EMPTY_VALUES: error = self.error_messages['invalid_year'] raise forms.ValidationError(error) if data_list[0] in forms.fields.EMPTY_VALUES: error = self.error_messages['invalid_month'] raise forms.ValidationError(error) year = int(data_list[1]) month = int(data_list[0]) # find last day of the month day = monthrange(year, month)[1] return date(year, month, day) return None class PaymentForm(forms.Form): number = CreditCardField(required = True, label = "Card Number") holder = forms.CharField(required = True, label = "Card Holder Name", max_length = 60) expiration = CCExpField(required = True, label = "Expiration") ccv_number = forms.IntegerField(required = True, label = "CCV Number", max_value = 9999, widget = forms.TextInput(attrs={'size': '4'})) def __init__(self, *args, **kwargs): self.payment_data = kwargs.pop('payment_data', None) super(PaymentForm, self).__init__(*args, **kwargs) def clean(self): cleaned = super(PaymentForm, self).clean() if not self.errors: result = self.process_payment() if result and result[0] == 'Card declined': raise forms.ValidationError('Your credit card was declined.') elif result and result[0] == 'Processing error': raise forms.ValidationError( 'We encountered the following error while processing '+\ 'your credit card: '+result[1]) return cleaned def process_payment(self): if self.payment_data: # don't process payment if payment_data wasn't set datadict = self.cleaned_data datadict.update(self.payment_data) from virtualmerchant import VirtualMerchant vmerchant = VirtualMerchant(datadict) return vmerchant.process_virtualmerchant_payment() </code></pre> <p>In the above example payment form, how would you pass initial data to PaymentForm.expiration field? </p> <p>I know you can do:</p> <pre><code>c = PaymentForm({'number':'1234567890', 'holder':'Bob Barker','ccv_number':'123'}) </code></pre> <p>However, how do you pass data to a custom field such as the one implemented here? </p>
 

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