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import json
from psycopg2.extras import DateRange, DateTimeTZRange, NumericRange, Range
from django.contrib.postgres import forms, lookups
from django.db import models
from django.utils import six
__all__ = [
'RangeField', 'IntegerRangeField', 'BigIntegerRangeField',
'FloatRangeField', 'DateTimeRangeField', 'DateRangeField',
]
class RangeField(models.Field):
empty_strings_allowed = False
def get_prep_value(self, value):
if value is None:
return None
elif isinstance(value, Range):
return value
elif isinstance(value, (list, tuple)):
return self.range_type(value[0], value[1])
return value
def to_python(self, value):
if isinstance(value, six.string_types):
value = self.range_type(**json.loads(value))
elif isinstance(value, (list, tuple)):
value = self.range_type(value[0], value[1])
return value
def value_to_string(self, obj):
value = self._get_val_from_obj(obj)
if value is None:
return None
if value.isempty:
return json.dumps({"empty": True})
return json.dumps({
"lower": value.lower,
"upper": value.upper,
"bounds": value._bounds,
})
def formfield(self, **kwargs):
kwargs.setdefault('form_class', self.form_field)
return super(RangeField, self).formfield(**kwargs)
class IntegerRangeField(RangeField):
base_field = models.IntegerField()
range_type = NumericRange
form_field = forms.IntegerRangeField
def db_type(self, connection):
return 'int4range'
class BigIntegerRangeField(RangeField):
base_field = models.BigIntegerField()
range_type = NumericRange
form_field = forms.IntegerRangeField
def db_type(self, connection):
return 'int8range'
class FloatRangeField(RangeField):
base_field = models.FloatField()
range_type = NumericRange
form_field = forms.FloatRangeField
def db_type(self, connection):
return 'numrange'
class DateTimeRangeField(RangeField):
base_field = models.DateTimeField()
range_type = DateTimeTZRange
form_field = forms.DateTimeRangeField
def db_type(self, connection):
return 'tstzrange'
class DateRangeField(RangeField):
base_field = models.DateField()
range_type = DateRange
form_field = forms.DateRangeField
def db_type(self, connection):
return 'daterange'
RangeField.register_lookup(lookups.DataContains)
RangeField.register_lookup(lookups.ContainedBy)
RangeField.register_lookup(lookups.Overlap)
@RangeField.register_lookup
class FullyLessThan(lookups.PostgresSimpleLookup):
lookup_name = 'fully_lt'
operator = '<<'
@RangeField.register_lookup
class FullGreaterThan(lookups.PostgresSimpleLookup):
lookup_name = 'fully_gt'
operator = '>>'
@RangeField.register_lookup
class NotLessThan(lookups.PostgresSimpleLookup):
lookup_name = 'not_lt'
operator = '&>'
@RangeField.register_lookup
class NotGreaterThan(lookups.PostgresSimpleLookup):
lookup_name = 'not_gt'
operator = '&<'
@RangeField.register_lookup
class AdjacentToLookup(lookups.PostgresSimpleLookup):
lookup_name = 'adjacent_to'
operator = '-|-'
@RangeField.register_lookup
class RangeStartsWith(lookups.FunctionTransform):
lookup_name = 'startswith'
function = 'lower'
@property
def output_field(self):
return self.lhs.output_field.base_field
@RangeField.register_lookup
class RangeEndsWith(lookups.FunctionTransform):
lookup_name = 'endswith'
function = 'upper'
@property
def output_field(self):
return self.lhs.output_field.base_field
@RangeField.register_lookup
class IsEmpty(lookups.FunctionTransform):
lookup_name = 'isempty'
function = 'isempty'
output_field = models.BooleanField()
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