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POUpdating three way junction table in SqlAlchemy
 

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  1. POUpdating three way junction table in SqlAlchemy
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    <p><strong>Update</strong></p> <p>The problem is that when the object is persited into the database for every change a new <strong>INSERT</strong> expession is generated. What I need is only one <strong>INSERT</strong> which to include all of the columns.</p> <pre class="lang-python prettyprint-override"><code>#First **INSERT** request plane.hangar.appen(hangar) #Second **INSERT** request users.planes.append(plane) </code></pre> <p>I have the following database structure described with <strong>SqlAlchemy</strong>. What I want to do is to insert a new record in the table "<strong><code>users_planes_hangars</code></strong>". I'm trying to do that in the following way:</p> <pre class="lang-python prettyprint-override"><code>plane= dbSession.query(Plane).filter(Plane.plane_id == planeId).first() garage = dbSession.query(Hangar).filter(Hangar.hangar_id == hangarId).first() plane.hangar.appen(hangar) users.planes.append(plane) dbSession.commit() </code></pre> <p>The problem is that the executed query (the query below) does not include the <code>user_id</code>, it only includes the <code>plane_id</code> and the <code>hangar_id</code>.</p> <pre class="lang-sql prettyprint-override"><code>INSERT INTO users_planes_hangars (plane_id, hangar_id) VALUES (%(plane_id)s, %(hangar_id)s) RETURNING users_planes_hangars.user_id' {'hangar_id': 4, 'plane_id': 16} </code></pre> <pre class="lang-python prettyprint-override"><code>|usersTabe| &lt;--- |users_planes_hangars_table| ---&gt; |planesTable| | \|/ |hangarsTable| class User(object): pass class Plane(object): pass class Hangar(object): pass usersMeta = Table("user", Column("user_id", Integer, primary_key = True) ) mapper(User, usersMeta, properties = { "planes": relationship(Plane, usersPlanesHangars) }) planesMeta = Table("planes", Column("plane_id", Integer, primary_key = True) ) mapper(Plane, planesMeta, properties = { "hangar": relationship(Hangar, usersPlanesHangars) }) hangarMeta = Table("hangars", Column("hangar_id", Integer, primary_key = True) ) usersPlanesHangars = Table("users_planes_hangars", Column("user_id", Integer, ForeinKey("users.user_id"), primary_key = True) Column("plane_id", Integer, ForeinKey("planes.plane_id"), primary_key = True) Column("hangar_id", Integer, ForeinKey("hangar.hangar_id"), primary_key = True) ) </code></pre>
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    1. USbozhidarc
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    1. COHow do 'Car' and 'Garage' come into picture?
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