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Fixed #18757, #14462, #21565 -- Reworked database-python type conversions

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Complete rework of translating data values from database

Deprecation of SubfieldBase, removal of resolve_columns and
convert_values in favour of a more general converter based approach and
public API Field.from_db_value(). Now works seamlessly with aggregation,
.values() and raw queries.

Thanks to akaariai in particular for extensive advice and inspiration,
also to shaib, manfre and timograham for their reviews.
This commit is contained in:
Marc Tamlyn 2014-08-12 13:08:40 +01:00
parent 89559bcfb0
commit e9103402c0
35 changed files with 443 additions and 521 deletions
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11
django/db/backends/mysql/base.py
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@ -394,6 +394,17 @@ class DatabaseOperations(BaseDatabaseOperations):
return 'POW(%s)' % ','.join(sub_expressions)
return super(DatabaseOperations, self).combine_expression(connector, sub_expressions)
def get_db_converters(self, internal_type):
converters = super(DatabaseOperations, self).get_db_converters(internal_type)
if internal_type in ['BooleanField', 'NullBooleanField']:
converters.append(self.convert_booleanfield_value)
return converters
def convert_booleanfield_value(self, value, field):
if value in (0, 1):
value = bool(value)
return value
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'mysql'