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Fixed #29767 -- Made date-related casts work on SQLite

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Thanks Rémy Hubscher for the report and Tim Graham and Simon Charette for the reviews.
This commit is contained in:
Claude Paroz 2018-09-18 13:59:10 +02:00
parent 0b3b7c4b0a
commit fc3a463048
4 changed files with 58 additions and 2 deletions
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14
django/db/models/functions/comparison.py
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@ -14,6 +14,20 @@ class Cast(Func):
extra_context['db_type'] = self.output_field.cast_db_type(connection)
return super().as_sql(compiler, connection, **extra_context)
def as_sqlite(self, compiler, connection, **extra_context):
db_type = self.output_field.db_type(connection)
if db_type in {'datetime', 'time'}:
# Use strftime as datetime/time don't keep fractional seconds.
template = 'strftime(%%s, %(expressions)s)'
sql, params = super().as_sql(compiler, connection, template=template, **extra_context)
format_string = '%H:%M:%f' if db_type == 'time' else '%Y-%m-%d %H:%M:%f'
params.insert(0, format_string)
return sql, params
elif db_type == 'date':
template = 'date(%(expressions)s)'
return super().as_sql(compiler, connection, template=template, **extra_context)
return self.as_sql(compiler, connection, **extra_context)
def as_mysql(self, compiler, connection, **extra_context):
# MySQL doesn't support explicit cast to float.
template = '(%(expressions)s + 0.0)' if self.output_field.get_internal_type() == 'FloatField' else None