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POHow can I perform this Recursive Common Table Expression in SQLAlchemy?
 

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  1. POHow can I perform this Recursive Common Table Expression in SQLAlchemy?
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    <p>In this table schema:</p> <pre><code>class Location(db.Model): id = db.Column(db.String(255), primary_key=True) parent_id = db.Column(db.String(255), db.ForeignKey('location.id'), nullable=True) type = db.Column(db.String(255)) name = db.Column(db.String(255)) options = db.Column(db.Text, nullable=True) </code></pre> <p>I have a parent, suppose this table:</p> <pre><code>&gt; select * from location; +--------------------------------------+--------------------------------------+---------+-----------+---------+ | id | parent_id | type | name | options | +--------------------------------------+--------------------------------------+---------+-----------+---------+ | 8821da60-e7d2-11e1-951e-ae16bc2b7368 | 88227a60-e7d2-11e1-951e-ae16bc2b7368 | city | sengkang | NULL | | 88227a60-e7d2-11e1-951e-ae16bc2b7368 | NULL | country | singapore | NULL | +--------------------------------------+--------------------------------------+---------+-----------+---------+ </code></pre> <p>The parent being the <strong>country</strong> object named <strong>singapore</strong>. There can be more nested objects, that are children to <strong>sengkang</strong> just like how <strong>sengkang</strong> is child to <strong>singapore</strong>.</p> <p>So a single hierachy chain might look like a -> b -> sengkang -> singapore</p> <p>whereby -> means <em>is child of</em></p> <p>How can I get all Location objects that have the parent as singapore, including the parent object (singapore)? (in SQLAlchemy please). Thanks!</p>
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