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