115 lines
5.6 KiB
Python
115 lines
5.6 KiB
Python
import argparse
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import inspect
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from django.contrib.gis import gdal
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from django.core.management.base import BaseCommand, CommandError
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class LayerOptionAction(argparse.Action):
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"""
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Custom argparse action for the `ogrinspect` `layer_key` keyword option
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which may be an integer or a string.
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"""
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def __call__(self, parser, namespace, value, option_string=None):
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try:
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setattr(namespace, self.dest, int(value))
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except ValueError:
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setattr(namespace, self.dest, value)
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class ListOptionAction(argparse.Action):
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"""
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Custom argparse action for `ogrinspect` keywords that require
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a string list. If the string is 'True'/'true' then the option
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value will be a boolean instead.
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"""
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def __call__(self, parser, namespace, value, option_string=None):
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if value.lower() == 'true':
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setattr(namespace, self.dest, True)
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else:
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setattr(namespace, self.dest, value.split(','))
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class Command(BaseCommand):
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help = ('Inspects the given OGR-compatible data source (e.g., a shapefile) and outputs\n'
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'a GeoDjango model with the given model name. For example:\n'
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' ./manage.py ogrinspect zipcode.shp Zipcode')
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requires_system_checks = False
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def add_arguments(self, parser):
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parser.add_argument('data_source', help='Path to the data source.')
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parser.add_argument('model_name', help='Name of the model to create.')
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parser.add_argument('--blank', dest='blank',
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action=ListOptionAction, default=False,
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help='Use a comma separated list of OGR field names to add '
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'the `blank=True` option to the field definition. Set to `true` '
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'to apply to all applicable fields.')
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parser.add_argument('--decimal', dest='decimal',
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action=ListOptionAction, default=False,
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help='Use a comma separated list of OGR float fields to '
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'generate `DecimalField` instead of the default '
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'`FloatField`. Set to `true` to apply to all OGR float fields.')
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parser.add_argument('--geom-name', dest='geom_name', default='geom',
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help='Specifies the model name for the Geometry Field '
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'(defaults to `geom`)')
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parser.add_argument('--layer', dest='layer_key',
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action=LayerOptionAction, default=0,
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help='The key for specifying which layer in the OGR data '
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'source to use. Defaults to 0 (the first layer). May be '
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'an integer or a string identifier for the layer.')
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parser.add_argument('--multi-geom', action='store_true',
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dest='multi_geom', default=False,
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help='Treat the geometry in the data source as a geometry collection.')
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parser.add_argument('--name-field', dest='name_field',
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help='Specifies a field name to return for the `__unicode__`/`__str__` function.')
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parser.add_argument('--no-imports', action='store_false', dest='imports', default=True,
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help='Do not include `from django.contrib.gis.db import models` statement.')
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parser.add_argument('--null', dest='null', action=ListOptionAction, default=False,
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help='Use a comma separated list of OGR field names to add '
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'the `null=True` option to the field definition. Set to `true` '
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'to apply to all applicable fields.')
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parser.add_argument('--srid', dest='srid',
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help='The SRID to use for the Geometry Field. If it can be '
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'determined, the SRID of the data source is used.')
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parser.add_argument('--mapping', action='store_true', dest='mapping',
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help='Generate mapping dictionary for use with `LayerMapping`.')
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def handle(self, *args, **options):
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data_source, model_name = options.pop('data_source'), options.pop('model_name')
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if not gdal.HAS_GDAL:
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raise CommandError('GDAL is required to inspect geospatial data sources.')
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# Getting the OGR DataSource from the string parameter.
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try:
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ds = gdal.DataSource(data_source)
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except gdal.OGRException as msg:
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raise CommandError(msg)
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# Returning the output of ogrinspect with the given arguments
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# and options.
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from django.contrib.gis.utils.ogrinspect import _ogrinspect, mapping
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# Filter options to params accepted by `_ogrinspect`
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ogr_options = dict((k, v) for k, v in options.items()
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if k in inspect.getargspec(_ogrinspect).args and v is not None)
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output = [s for s in _ogrinspect(ds, model_name, **ogr_options)]
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if options['mapping']:
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# Constructing the keyword arguments for `mapping`, and
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# calling it on the data source.
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kwargs = {'geom_name': options['geom_name'],
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'layer_key': options['layer_key'],
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'multi_geom': options['multi_geom'],
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}
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mapping_dict = mapping(ds, **kwargs)
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# This extra legwork is so that the dictionary definition comes
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# out in the same order as the fields in the model definition.
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rev_mapping = dict((v, k) for k, v in mapping_dict.items())
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output.extend(['', '# Auto-generated `LayerMapping` dictionary for %s model' % model_name,
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'%s_mapping = {' % model_name.lower()])
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output.extend(" '%s' : '%s'," % (
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rev_mapping[ogr_fld], ogr_fld) for ogr_fld in ds[options['layer_key']].fields
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)
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output.extend([" '%s' : '%s'," % (options['geom_name'], mapping_dict[options['geom_name']]), '}'])
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return '\n'.join(output) + '\n'
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