mpeltriaux
8af0e41e2d
* improves frontend layout to display more details on district, municipal and parce group * improves ordering of parcels * refactors parcel related models * improves parcel fetching * extends and simplifies sanitize_db parcel related code
130 lines
4.0 KiB
Python
130 lines
4.0 KiB
Python
"""
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Author: Michel Peltriaux
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Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
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Contact: michel.peltriaux@sgdnord.rlp.de
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Created on: 16.12.21
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"""
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from django.db import models
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from konova.models import UuidModel
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class AdministrativeSpatialReference(models.Model):
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key = models.CharField(
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max_length=255,
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help_text="Represents Kreisschlüssel",
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null=True,
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blank=True
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)
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name = models.CharField(
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max_length=1000,
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help_text="Kreis",
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null=True,
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blank=True,
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)
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class Meta:
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abstract = True
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def __str__(self):
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return f"{self.name} ({self.key})"
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@property
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def table_str(self):
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return f"{self.name} ({self.key})"
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class District(UuidModel, AdministrativeSpatialReference):
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""" The model District refers to "Kreis"
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"""
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pass
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class Municipal(UuidModel, AdministrativeSpatialReference):
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""" The model Municipal refers to "Gemeinde"
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"""
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district = models.ForeignKey(
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District,
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on_delete=models.SET_NULL,
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null=True,
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blank=True,
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)
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class ParcelGroup(UuidModel, AdministrativeSpatialReference):
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""" The model ParcelGroup refers to "Gemarkung", which is defined as a loose group of parcels
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"""
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municipal = models.ForeignKey(
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Municipal,
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on_delete=models.SET_NULL,
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null=True,
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blank=True,
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)
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class Parcel(UuidModel):
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""" The Parcel model holds administrative data on covered properties.
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Due to the unique but relevant naming of the administrative data, we have to use these namings as field
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names in german. Any try to translate them to English result in strange or insufficient translations.
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All fields have to be CharFields as well, since there are e.g. Flurstücksnummer holding e.g. '123____' which
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can not be realized using numerical fields.
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To avoid conflicts due to german Umlaute, the field names are shortened and vocals are dropped.
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"""
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geometries = models.ManyToManyField("konova.Geometry", blank=True, related_name="parcels", through='ParcelIntersection')
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district = models.ForeignKey("konova.District", on_delete=models.SET_NULL, null=True, blank=True, related_name="parcels")
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municipal = models.ForeignKey("konova.Municipal", on_delete=models.SET_NULL, null=True, blank=True, related_name="parcels")
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parcel_group = models.ForeignKey(
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"konova.ParcelGroup",
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on_delete=models.SET_NULL,
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help_text="Gemarkung",
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null=True,
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blank=True,
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related_name="parcels"
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)
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flr = models.IntegerField(
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help_text="Flur",
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null=True,
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blank=True,
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)
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flrstck_nnr = models.IntegerField(
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help_text="Flurstücksnenner",
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null=True,
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blank=True,
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)
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flrstck_zhlr = models.IntegerField(
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help_text="Flurstückszähler",
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null=True,
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blank=True,
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)
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updated_on = models.DateTimeField(auto_now_add=True)
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def __str__(self):
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return f"{self.parcel_group} | {self.flr} | {self.flrstck_zhlr} | {self.flrstck_nnr}"
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class ParcelIntersection(UuidModel):
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""" ParcelIntersection is an intermediary model, which is used to configure the
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M2M relation between Parcel and Geometry.
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Based on uuids, we will not have (practically) any problems on outrunning primary keys
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and extending the model with calculated_on timestamp, we can 'hide' entries while they
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are being recalculated and keep track on the last time they have been calculated this
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way.
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Please note: The calculated_on describes when the relation between the Parcel and the Geometry
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has been established. The updated_on field of Parcel describes when this Parcel has been
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changed the last time.
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"""
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parcel = models.ForeignKey(Parcel, on_delete=models.CASCADE)
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geometry = models.ForeignKey("konova.Geometry", on_delete=models.CASCADE)
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calculated_on = models.DateTimeField(auto_now_add=True, null=True, blank=True)
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