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- import sys
- from django.db.models.fields import DecimalField, FloatField, IntegerField
- from django.db.models.functions import Cast
- class FixDecimalInputMixin:
- def as_postgresql(self, compiler, connection, **extra_context):
- # Cast FloatField to DecimalField as PostgreSQL doesn't support the
- # following function signatures:
- # - LOG(double, double)
- # - MOD(double, double)
- output_field = DecimalField(decimal_places=sys.float_info.dig, max_digits=1000)
- clone = self.copy()
- clone.set_source_expressions([
- Cast(expression, output_field) if isinstance(expression.output_field, FloatField)
- else expression for expression in self.get_source_expressions()
- ])
- return clone.as_sql(compiler, connection, **extra_context)
- class FixDurationInputMixin:
- def as_mysql(self, compiler, connection, **extra_context):
- sql, params = super().as_sql(compiler, connection, **extra_context)
- if self.output_field.get_internal_type() == 'DurationField':
- sql = 'CAST(%s AS SIGNED)' % sql
- return sql, params
- def as_oracle(self, compiler, connection, **extra_context):
- if self.output_field.get_internal_type() == 'DurationField':
- expression = self.get_source_expressions()[0]
- options = self._get_repr_options()
- from django.db.backends.oracle.functions import (
- IntervalToSeconds, SecondsToInterval,
- )
- return compiler.compile(
- SecondsToInterval(self.__class__(IntervalToSeconds(expression), **options))
- )
- return super().as_sql(compiler, connection, **extra_context)
- class NumericOutputFieldMixin:
- def _resolve_output_field(self):
- source_fields = self.get_source_fields()
- if any(isinstance(s, DecimalField) for s in source_fields):
- return DecimalField()
- if any(isinstance(s, IntegerField) for s in source_fields):
- return FloatField()
- return super()._resolve_output_field() if source_fields else FloatField()
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