How to use pre_save_clean method in Kiwi

Best Python code snippet using Kiwi_python

models.py

Source:models.py

1"""2Aristotle MDR 11179 Link and Relationship models3================================================4These are based on the Link and Relation definitions in ISO/IEC 11179 Part 3 - 9.1.2.4 - 9.1.2.55"""6from django.db import models7from django.db.models.signals import pre_save8from django.core.exceptions import ValidationError9from django.core.validators import MinValueValidator10from django.utils.translation import ugettext_lazy as _11from django.utils.encoding import python_2_unicode_compatible  # Python 212from model_utils.models import TimeStampedModel13from aristotle_mdr import models as MDR14from aristotle_mdr.signals import pre_save_clean15class Relation(MDR.concept):  # 9.1.2.416    """17    """18    arity = models.PositiveIntegerField(  # 9.1.2.4.3.119        help_text=_('number of elements in the relation'),20        validators=[MinValueValidator(2)]21    )22@python_2_unicode_compatible  # Python 223class RelationRole(MDR.aristotleComponent):  # 9.1.2.524    name = models.TextField(25        help_text=_("The primary name used for human identification purposes.")26    )27    definition = models.TextField(28        _('definition'),29        help_text=_("Representation of a concept by a descriptive statement "30                    "which serves to differentiate it from related concepts. (3.2.39)")31    )32    multiplicity = models.PositiveIntegerField(  # 9.1.2.5.3.133        # a.k.a the number of times it can appear in a link :(34        help_text=_(35            'number of links which must (logically) be members of the source '36            'relation of this role, differing only by an end with this role as '37            'an end_role.'38        ),39        null=True,40        blank=True,41    )42    ordinal = models.PositiveIntegerField(  # 9.1.2.5.3.243        help_text=_(44            'order of the relation role among other relation roles in the relation.'45        )46    )47    relation = models.ForeignKey(Relation)48    @property49    def parentItem(self):50        return self.relation51    def __str__(self):52        return "{0.name}".format(self)53class Link(TimeStampedModel):54    """55    Link is a class each instance of which models a link (3.2.69).56    A link is a member of a relation (3.2.119) (not an instance of a relation).57    In relational database parlance, a link would be a tuple (row) in a relation (table).58    Link is a subclass of Assertion (9.1.2.3), and as such is included in one or more59    Concept_Systems (9.1.2.2) through the assertion_inclusion (9.1.3.5) association.60    """61    relation = models.ForeignKey(Relation)62    def concepts(self):63        return MDR._concept.objects.filter(linkend__link=self).all().distinct()64    def add_link_end(self, role, concept):65        return LinkEnd.objects.create(link=self, role=role, concept=concept)66class LinkEnd(TimeStampedModel):  # 9.1.2.767    link = models.ForeignKey(Link)68    role = models.ForeignKey(RelationRole)69    concept = models.ForeignKey(MDR._concept)70    def clean(self):71        if self.role.relation != self.link.relation:72            raise ValidationError(73                _('A link ends role relation must be from the relation itself')74            )...

apps.py

Source:apps.py

1from django.apps import AppConfig as DjangoAppConfig2class AppConfig(DjangoAppConfig):3    name = 'tcms.testplans'4    def ready(self):5        from django.db.models.signals import post_save, pre_save6        from .models import TestPlan7        from tcms import signals8        pre_save.connect(signals.pre_save_clean, TestPlan)...

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