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1 """ |
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2 The GeometryColumns and SpatialRefSys models for the PostGIS backend. |
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3 """ |
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4 from django.db import models |
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5 from django.contrib.gis.db.backends.base import SpatialRefSysMixin |
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6 |
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7 class GeometryColumns(models.Model): |
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8 """ |
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9 The 'geometry_columns' table from the PostGIS. See the PostGIS |
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10 documentation at Ch. 4.2.2. |
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11 """ |
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12 f_table_catalog = models.CharField(max_length=256) |
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13 f_table_schema = models.CharField(max_length=256) |
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14 f_table_name = models.CharField(max_length=256) |
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15 f_geometry_column = models.CharField(max_length=256) |
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16 coord_dimension = models.IntegerField() |
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17 srid = models.IntegerField(primary_key=True) |
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18 type = models.CharField(max_length=30) |
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19 |
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20 class Meta: |
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21 db_table = 'geometry_columns' |
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22 managed = False |
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23 |
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24 @classmethod |
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25 def table_name_col(cls): |
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26 """ |
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27 Returns the name of the metadata column used to store the |
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28 the feature table name. |
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29 """ |
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30 return 'f_table_name' |
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31 |
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32 @classmethod |
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33 def geom_col_name(cls): |
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34 """ |
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35 Returns the name of the metadata column used to store the |
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36 the feature geometry column. |
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37 """ |
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38 return 'f_geometry_column' |
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39 |
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40 def __unicode__(self): |
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41 return "%s.%s - %dD %s field (SRID: %d)" % \ |
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42 (self.f_table_name, self.f_geometry_column, |
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43 self.coord_dimension, self.type, self.srid) |
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44 |
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45 class SpatialRefSys(models.Model, SpatialRefSysMixin): |
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46 """ |
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47 The 'spatial_ref_sys' table from PostGIS. See the PostGIS |
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48 documentaiton at Ch. 4.2.1. |
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49 """ |
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50 srid = models.IntegerField(primary_key=True) |
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51 auth_name = models.CharField(max_length=256) |
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52 auth_srid = models.IntegerField() |
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53 srtext = models.CharField(max_length=2048) |
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54 proj4text = models.CharField(max_length=2048) |
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55 |
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56 class Meta: |
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57 db_table = 'spatial_ref_sys' |
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58 managed = False |
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59 |
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60 @property |
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61 def wkt(self): |
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62 return self.srtext |
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63 |
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64 @classmethod |
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65 def wkt_col(cls): |
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66 return 'srtext' |