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Add simple JSONTextDict data type for SQLAlchemy columns

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for basic JSON awareness/conversion
This commit is contained in:
Lance Edgar 2019-03-20 16:48:38 -05:00
parent 20beaf0fc8
commit 95d55f49bf
1 changed files with 25 additions and 3 deletions
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28
rattail/db/types.py
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@ -1,8 +1,8 @@
# -*- coding: utf-8 -*- # -*- coding: utf-8; -*-
################################################################################ ################################################################################
# #
# Rattail -- Retail Software Framework # Rattail -- Retail Software Framework
# Copyright © 2010-2017 Lance Edgar # Copyright © 2010-2019 Lance Edgar
# #
# This file is part of Rattail. # This file is part of Rattail.
# #
@ -24,7 +24,9 @@
Data Types Data Types
""" """
from __future__ import unicode_literals from __future__ import unicode_literals, absolute_import
import json
from sqlalchemy import types from sqlalchemy import types
@ -47,3 +49,23 @@ class GPCType(types.TypeDecorator):
if value is None: if value is None:
return None return None
return GPC(value) return GPC(value)
class JSONTextDict(types.TypeDecorator):
"""
SQLAlchemy type engine for JSON data. Interprets "raw" text as JSON when
reading from DB, and writes JSON text back to DB.
Note that the Python value for a field with this type will appear as a dict.
"""
impl = types.Text
def process_bind_param(self, value, dialect):
if value is not None:
value = json.dumps(value)
return value
def process_result_value(self, value, dialect):
if value is not None:
value = json.loads(value)
return value