如何对 JSONB 内容运行 Flask-restless api 过滤器查询

Posted 2023-02-27

【中文标题】如何对 JSONB 内容运行 Flask-restless api 过滤器查询

【英文标题】：How to run a Flask-restless api filter query on JSONB content

【发布时间】：2017-05-14 02:46:18

【问题描述】：

我在尝试对 JSONB 对象中包含的数据执行无烧瓶 api 查询时遇到问题。我猜是因为底层查询不知道如何转换数据字段，所以它不知道如何正确生成查询，但我不确定。

执行 ajax 搜索时运行的查询：

http://192.168.163.129:1080/api/subscribers?page=1&results_per_page=10&q="filters":["name":"data","op":"has","val":"name":"full_name","op":"eq","val":"%Steve%"],"order_by":["field":"created","direction":"asc"]

这是我运行查询时得到的回溯。

2016-12-29 22:26:33,068 - app - ERROR - mapper
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/views.py", line 1172, in _search
    result = search(self.session, self.model, search_params)
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 587, in search
    query = create_query(session, model, search_params, _ignore_order_by)
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 549, in create_query
    _ignore_order_by)
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 480, in create_query
    filters = [create_filt(model, filt) for filt in search_params.filters]
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 438, in _create_filter
    return create_op(model, fname, filt.operator, val, relation)
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 411, in _create_operation
    return opfunc(field, argument, fieldname)
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 106, in <lambda>
    'has': lambda f, a, fn: f.has(_sub_operator(f, a, fn)),
  File "/usr/local/lib/python2.7/dist-packages/flask_restless/search.py", line 37, in _sub_operator
    submodel = model.property.mapper.class_
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 833, in __getattr__
    return self._fallback_getattr(key)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 811, in _fallback_getattr
    raise AttributeError(key)
AttributeError: mapper

API 代码：

manager.create_api(Subscribers, methods=['GET'], results_per_page=10,
                   preprocessors=dict(GET_SINGLE=[subscribers_preprocessor],
                                      GET_MANY=[subscribers_preprocessor]))

预处理器是一个简单的身份验证处理器。

知道如何正确格式化过滤器以过滤 JSONB postgres 字段吗？

【问题讨论】：

你能发布Subscribers类的定义吗？

我认为这并不重要。但它是一个以 db.JSONB 而不是 db.String 作为标识符的通用表。

【参考方案1】：

此时的答案是，你不能像以前那样使用 flask-restless。

我对 flask-restless 进行了一些修改，以拆分特殊格式的查询字符串并将查询正确转换为 jsonb。有点痛苦，而且可能无法扩展。

它被标记为在flask-restless git上增强。

https://github.com/jfinkels/flask-restless/issues/623