對於SQLAlchemy查詢，如何將ilike搜索運算符與in_運算符組合？

Question

我正在編寫SQLAlchemy代碼，它接受搜索欄的輸入並對我的PostgreSQL數據庫運行查詢。 為了允許拼寫錯誤和名稱碎片，我有這個代碼可以做到這一點：

q = session.query(Detail).filter((Detail.sellers.ilike("%%%s%%" % (name_input)))).all()

現在我嘗試做同樣的事情，但要檢查具有多個輸入值的列表names 。 我已經完成了這樣的事情：

q = session.query(Detail).filter((Detail.sellers.in_(names))

但是，這需要完全匹配。 我想結合ilike運算符和in_運算符。 這可能嗎？ 我試過了：

q = session.query(Detail).filter((Detail.sellers.ilike.in_(names))

這給出了以下回溯和錯誤：

File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
  return self.wsgi_app(environ, start_response)
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
  response = self.make_response(self.handle_exception(e))
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
  reraise(exc_type, exc_value, tb)
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
  response = self.full_dispatch_request()
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
  rv = self.handle_user_exception(e)
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
  reraise(exc_type, exc_value, tb)
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
  rv = self.dispatch_request()
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
  return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/Tom/projects/land-records/repo/scripts/app.py", line 162, in search
  return query_db(names)
File "/Users/Tom/projects/land-records/lib/python2.7/site-packages/flask_cache/__init__.py", line 537, in decorated_function
  rv = f(*args, **kwargs)
File "/Users/Tom/projects/land-records/repo/scripts/app.py", line 106, in query_db
  q = session.query(Detail).filter((Detail.sellers.ilike.in_(names))).all()

AttributeError: 'function' object has no attribute 'in_'

Answer 1

如果它只是不區分大小寫的'in_'語句：

from sqlalchemy import func

q = session.query(Detail).filter(
    func.lower(Detail.sellers).in_(map(str.lower, names))
)

否則，如果你想要多個“ilike”陳述，

from sqlalchemy import or_

conditions = []
for name in names:
    conditions.append(Detail.sellers.ilike('%{}%'.format(name)))

q = session.query(Detail).filter(
    or_(*conditions)
)

我沒有測試它，如果它不起作用，我可以編輯它。