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POSQLAlchemy join with filtering doesn't actually filter
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  1. POSQLAlchemy join with filtering doesn't actually filter
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    copied!<p>The problem is in the header of topic. So here are the details.</p> <p>I am using Flask-SQLAlchemy and PostgreSQL and my db schema is like this:</p> <pre><code>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 '&lt;Settings %r, %r&gt;' % (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 '&lt;Lang %r, %r&gt;' % (self.lang, self.value) </code></pre> <p>I use query like this:</p> <pre><code>for data in db.session.query(Settings).join(Lang).filter(Lang.lang.contains('en')).all(): print data </code></pre> <p>And expect it to return only settings with 'en' language. But instead I get all the languages.</p> <p>What can be the problem and how to deal with it?</p> <p>UPD: SQL output</p> <pre><code>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} </code></pre> <p>Example row from settings_lang:</p> <pre> id parent_id lang value 1 1 "en" "Research" 2 1 "ru" "НПП"</pre>
 

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