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POError while adding objects via admin site in django
 

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  1. POError while adding objects via admin site in django
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    <p>I've created the following models:</p> <pre><code>class BasePrice(models.Model): start_hour = models.TimeField(blank=False) end_hour = models.TimeField(blank=False) monday = models.BooleanField(blank=False) tuesday = models.BooleanField(blank=False) wednesday = models.BooleanField(blank=False) thursday = models.BooleanField(blank=False) friday = models.BooleanField(blank=False) price = models.IntegerField(blank=False) def __unicode__(self): days = "" if (self.monday == True): days = days + " Mon" if (self.tuesday == True): days = days + " Tue" if (self.wednesday == True): days = days + " Wed" if (self.thursday == True): days = days + " Thu" if (self.friday == True): days = days + " Fri" return "Price " + str(self.price) + " at " + str(self.start_hour) + ":" +str(self.end_hour) + " in " + days def clean(self): if self.start_hour &gt; self.end_hour: raise ValidationError('Start hour is older than end hour!') class RentPeriod(models.Model): start_date = models.DateField(blank=False) end_date = models.DateField(blank=False) desk = models.ForeignKey(Desk) base_prices = models.ManyToManyField(BasePrice) def __unicode__(self): return "Period " + str(self.start_date) + " to " + str(self.end_date) + " for " + self.desk.__unicode__() def clean(self): if self.start_date &gt; self.end_date: raise ValidationError('Start date is older than end date!') def validate_unique(self, *args, **kwargs): super(RentPeriod, self).validate_unique(*args, **kwargs) # overlaping hours basePrices = self.base_prices.all() for price in basePrices: qs = self.__class__._default_manager.filter( (Q(monday=True) &amp; Q(monday=price.monday)) | (Q(tuesday=True) &amp; Q(tuesday=price.tuesday)) | (Q(wednesday=True) &amp; Q(wednesday=price.wednesday)) | (Q(thursday=True) &amp; Q(thursday=price.thursday)) | (Q(friday=True) &amp; Q(friday=price.friday)), start_hour__lte=self.end_hour, end_hour__gte=self.start_hour ) if qs.exists(): raise ValidationError({NON_FIELD_ERRORS: ('overlaping hours range',)}) </code></pre> <p>Generally, I'd like to avoid overlaping time in specified days when adding instances of RentPeriod via <strong>admin site.</strong> When I try to add RentPeriod instance, I get following error:</p> <blockquote> <p>'' needs to have a value for field "rentperiod" before this many-to-many relationship can be used.</p> </blockquote> <p>I've read <a href="https://stackoverflow.com/questions/6090859/django-instance-needs-to-have-a-primary-key-value-before-a-many-to-many-relatio">click</a>, but I don't have idea how to get it to work. Could you help?</p> <p><strong>Attention:</strong> complexity (n^2) has no matter in this case.</p> <p><strong>UPDATE</strong> I've created custom validator according to <a href="https://docs.djangoproject.com/en/dev/ref/contrib/admin/#adding-custom-validation-to-the-admin" rel="nofollow noreferrer">documentation</a></p> <p>forms.py</p> <pre><code>from biurrko.rents.models import RentPeriod from django.forms.models import ModelForm class RentPeriodForm(ModelForm): class Meta: model = RentPeriod def clean(self): cleaned_data = self.cleaned_data basePrices = cleaned_data['base_prices'] end_hour = cleaned_data['end_hour'] start_hour = cleaned_data['start_hour'] for price in basePrices: qs = basePrices.filter( (Q(monday=True) &amp; Q(monday=price.monday)) | (Q(tuesday=True) &amp; Q(tuesday=price.tuesday)) | (Q(wednesday=True) &amp; Q(wednesday=price.wednesday)) | (Q(thursday=True) &amp; Q(thursday=price.thursday)) | (Q(friday=True) &amp; Q(friday=price.friday)), start_hour__lte=end_hour, end_hour__gte=start_hour ) if qs.exists(): raise ValidationError({NON_FIELD_ERRORS: ('overlaping hours range',)}) # only for test raise ValidationError({NON_FIELD_ERRORS: ('reached',)}) # return cleaned_data </code></pre> <p>and admin.py</p> <pre><code>from django.contrib import admin from biurrko.rents.models import Desk, Room, RentPeriod, BasePrice from biurrko.rents.forms import RentPeriodForm admin.site.register(Desk) admin.site.register(Room) admin.site.register(RentPeriod) admin.site.register(BasePrice) class RentPeriodAdmin(admin.ModelAdmin): form = RentPeriodForm </code></pre> <p>Unfortunately, own validator "is not called" - I mean even test ValidationError is not raising.</p> <p><strong><em>UPDATE 2</em></strong> Figuret out that it was problem with "register" statement. It should be:</p> <pre><code>admin.site.register(RentPeriod, RentPeriodAdmin) </code></pre>
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