是否可以使用“LIKE”和 SqlAlchemy 在 JSONB 列表中搜索值？

Question

For example, if I have a JSONB column, and it is stored as:

["oranges","apples","bananas"]

How can I check using a LIKE type search if the substring "app" is in the list?

Ideally I would like be able to do something like:

Basket['fruits'].contains_like('%app%')

Is this possible with sqlalchemy?

Answer 1

Using inspiration from the pure PostgreSQL answer here , you can create the following condition:

from sqlalchemy import exists, func, literal_column

exists().select_from(
  func.jsonb_array_elements_text(Basket['fruits']).alias('fruit')
).where(literal_column('fruit').like('%app%'))

The answer raises the issue of performance and potentially adding an index in special cases (when you're only interested in strings starting with a certain value). Have a look if that applies to you and if you experience performance issues