Coverage for madrona/manipulators/models : 73%

from django.db import models 

from django.contrib.gis.db import models 

class BaseManipulatorGeometryManager(models.GeoManager): 

    """Returns the currently active data layer (determined by the active attribute). 

    """ 

    def current(self): 

        return self.get(active=True) 

class BaseManipulatorGeometry(models.Model): 

    """Abstract Model in which an inheriting subclass can be used for storing a data layer used by a Manipulator 

        ======================  ============================================== 

        Attribute               Description 

        ======================  ============================================== 

        ``creation_date``       When the layer was created. Is not changed on 

                                updates. 

        ``active``              Whether this layer represents the current  

                                data layer. If set to true and and another 

                                layer is active, that old layer will be  

                                deactivated. 

        ======================  ============================================== 

    """ 

    creation_date = models.DateTimeField(auto_now=True) 

    active = models.BooleanField(default=True, help_text=""" 

        Checking here indicates that this layer list should be the one used in 

        the application. Copies of other layer lists are retained in the 

        system so you can go back to an old version if necessary. 

    """) 

    objects = BaseManipulatorGeometryManager() 

    def save(self, *args, **kwargs): 

        super(BaseManipulatorGeometry, self).save(*args, **kwargs) 

        if self.active and self.__class__.objects.filter(active=True).count() > 1: 

            # Ensure that any previously active layer is deactivated -- There can be only one! 

            self.__class__.objects.filter(active=True).exclude(pk=self.pk).update(active=False) 

    class Meta: 

        abstract = True