updateOrCreateFromFields is made to call updateOrCreateFromKeyName.
updateOrCreateFromFields called self._model.get_or_insert which only creates
new entities but doesn't update the properties if the entity already exists.
So updateOrCreateFromFields is now made to call updateOrCreateFromKeyName
which actually updates the entity properties if entity already exists.
Reviewed by: Lennard de Rijk
"""
This module includes some utility functions for inspecting the layout
of a GDAL data source -- the functionality is analogous to the output
produced by the `ogrinfo` utility.
"""
from django.contrib.gis.gdal import DataSource
from django.contrib.gis.gdal.geometries import GEO_CLASSES
def ogrinfo(data_source, num_features=10):
"""
Walks the available layers in the supplied `data_source`, displaying
the fields for the first `num_features` features.
"""
# Checking the parameters.
if isinstance(data_source, str):
data_source = DataSource(data_source)
elif isinstance(data_source, DataSource):
pass
else:
raise Exception, 'Data source parameter must be a string or a DataSource object.'
for i, layer in enumerate(data_source):
print "data source : %s" % data_source.name
print "==== layer %s" % i
print " shape type: %s" % GEO_CLASSES[layer.geom_type.num].__name__
print " # features: %s" % len(layer)
print " srs: %s" % layer.srs
extent_tup = layer.extent.tuple
print " extent: %s - %s" % (extent_tup[0:2], extent_tup[2:4])
print "Displaying the first %s features ====" % num_features
width = max(*map(len,layer.fields))
fmt = " %%%ss: %%s" % width
for j, feature in enumerate(layer[:num_features]):
print "=== Feature %s" % j
for fld_name in layer.fields:
type_name = feature[fld_name].type_name
output = fmt % (fld_name, type_name)
val = feature.get(fld_name)
if val:
if isinstance(val, str):
val_fmt = ' ("%s")'
else:
val_fmt = ' (%s)'
output += val_fmt % val
else:
output += ' (None)'
print output
# For backwards compatibility.
sample = ogrinfo