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问题出在主题的标题中。所以这里是细节。

我正在使用 Flask-SQLAlchemy 和 PostgreSQL，我的数据库架构是这样的：

class Settings(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    key = db.Column(db.String(), unique=True)

    lang = db.relationship('Lang', order_by='Lang.id')

    def __init__(self, key, lang):
        self.key = key
        self.lang = lang

    def __repr__(self):
        return '<Settings %r, %r>' % (self.key, self.lang)

class Lang(db.Model):
    __tablename__ = 'settings_lang'
    id = db.Column(db.Integer, primary_key=True)
    lang = db.Column(db.String(2))
    value = db.Column(db.Text())

    parent_id = db.Column(db.Integer, db.ForeignKey('settings.id'))

    def __init__(self, lang, value):
        self.lang = lang
        self.value = value

    def __repr__(self):
        return '<Lang %r, %r>' % (self.lang, self.value)

我使用这样的查询：

for data in db.session.query(Settings).join(Lang).filter(Lang.lang.contains('en')).all():
    print data

并期望它只返回“en”语言的设置。但相反，我得到了所有的语言。

可能是什么问题以及如何处理？

UPD：SQL 输出

SELECT settings.id AS settings_id, settings.key AS settings_key 
FROM settings JOIN settings_lang ON settings.id = settings_lang.parent_id 
WHERE settings_lang.lang LIKE '%%' || %(lang_1)s || '%%'
{'lang_1': 'en'}

SELECT settings_lang.id AS settings_lang_id, settings_lang.lang AS settings_lang_lang, 
       settings_lang.value AS settings_lang_value,
       settings_lang.parent_id AS  settings_lang_parent_id 
FROM settings_lang 
WHERE %(param_1)s = settings_lang.parent_id ORDER BY settings_lang.id
{'param_1': 1}

来自 settings_lang 的示例行：

        id parent_id 语言值
        1 1 "zh" "研究"
        2 1 "ru" "НПП"
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