models.py

"""
 The GeometryColumns and SpatialRefSys models for the SpatiaLite backend.
"""
from django.contrib.gis.db.backends.base.models import SpatialRefSysMixin
from django.db import models


class SpatialiteGeometryColumns(models.Model):
    """
    The 'geometry_columns' table from SpatiaLite.
    """

    f_table_name = models.CharField(max_length=256)
    f_geometry_column = models.CharField(max_length=256)
    coord_dimension = models.IntegerField()
    srid = models.IntegerField(primary_key=True)
    spatial_index_enabled = models.IntegerField()
    type = models.IntegerField(db_column="geometry_type")

    class Meta:
        app_label = "gis"
        db_table = "geometry_columns"
        managed = False

    def __str__(self):
        return "%s.%s - %dD %s field (SRID: %d)" % (
            self.f_table_name,
            self.f_geometry_column,
            self.coord_dimension,
            self.type,
            self.srid,
        )

    @classmethod
    def table_name_col(cls):
        """
        Return the name of the metadata column used to store the feature table
        name.
        """
        return "f_table_name"

    @classmethod
    def geom_col_name(cls):
        """
        Return the name of the metadata column used to store the feature
        geometry column.
        """
        return "f_geometry_column"


class SpatialiteSpatialRefSys(models.Model, SpatialRefSysMixin):
    """
    The 'spatial_ref_sys' table from SpatiaLite.
    """

    srid = models.IntegerField(primary_key=True)
    auth_name = models.CharField(max_length=256)
    auth_srid = models.IntegerField()
    ref_sys_name = models.CharField(max_length=256)
    proj4text = models.CharField(max_length=2048)
    srtext = models.CharField(max_length=2048)

    class Meta:
        app_label = "gis"
        db_table = "spatial_ref_sys"
        managed = False

    @property
    def wkt(self):
        return self.srtext