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Fixed #12990, Refs #27694 -- Added JSONField model field.

Browse source 
Thanks to Adam Johnson, Carlton Gibson, Mariusz Felisiak, and Raphael
Michel for mentoring this Google Summer of Code 2019 project and
everyone else who helped with the patch.

Special thanks to Mads Jensen, Nick Pope, and Simon Charette for
extensive reviews.

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
This commit is contained in:
sage 2019-06-09 07:56:37 +07:00 • committed by Mariusz Felisiak
parent f97f71f592
commit 6789ded0a6
54 changed files with 2240 additions and 981 deletions
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15
django/db/models/functions/comparison.py
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@ -29,8 +29,14 @@ class Cast(Func):
return self.as_sql(compiler, connection, **extra_context)
def as_mysql(self, compiler, connection, **extra_context):
template = None
output_type = self.output_field.get_internal_type()
# MySQL doesn't support explicit cast to float.
template = '(%(expressions)s + 0.0)' if self.output_field.get_internal_type() == 'FloatField' else None
if output_type == 'FloatField':
template = '(%(expressions)s + 0.0)'
# MariaDB doesn't support explicit cast to JSON.
elif output_type == 'JSONField' and connection.mysql_is_mariadb:
template = "JSON_EXTRACT(%(expressions)s, '$')"
return self.as_sql(compiler, connection, template=template, **extra_context)
def as_postgresql(self, compiler, connection, **extra_context):
@ -39,6 +45,13 @@ class Cast(Func):
# expression.
return self.as_sql(compiler, connection, template='(%(expressions)s)::%(db_type)s', **extra_context)
def as_oracle(self, compiler, connection, **extra_context):
if self.output_field.get_internal_type() == 'JSONField':
# Oracle doesn't support explicit cast to JSON.
template = "JSON_QUERY(%(expressions)s, '$')"
return super().as_sql(compiler, connection, template=template, **extra_context)
return self.as_sql(compiler, connection, **extra_context)
class Coalesce(Func):
"""Return, from left to right, the first non-null expression."""