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POdon't want inner joins on django models
 

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  1. POdon't want inner joins on django models
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    <p>i've migrated an existing database that i would like to work with django. i have the following models:</p> <pre><code>class Device(models.Model): class Meta: db_table = u'DEVICES' managed=False id = models.CharField(primary_key=True, max_length=22, db_column='DEVICE_ID') name = models.CharField(max_length=40, db_column='DEVICE_NAME') status = models.CharField(max_length=10, db_column='STATUS') class DevicePort(models.Model): class Meta: db_table = u'DEVICE_PORT' managed=False id = models.CharField( primary_key=True, max_length=22, db_column='DEVICE_PORT_ID') device = models.OneToOneField(Device, db_column='DEVICE_ID') type = models.CharField( max_length=22, db_column='PORT_TYPE_ID') port_num = models.CharField( max_length=30, db_column='DEVICE_PORT_NUM') class IP(models.Model): class Meta: db_table = u'IP_NODE' managed=False ip_address = models.CharField(primary_key=True, max_length=15, db_column='IP_NODE_NO') hostname = models.CharField(max_length=40, db_column='IP_HOST') port = models.OneToOneField(DevicePort, db_column='DEVICE_PORT_ID') status = models.CharField(max_length=50, db_column='IP_NODE_STATUS') </code></pre> <p>i want a list of <code>Devices</code> and their relational <code>IP.ip_address</code> and <code>IP.hostname</code>s. In SQL, i would do something like:</p> <pre><code>SELECT UNIQUE d.device_name device FROM IP_NODE c, DEVICES d, DEVICE_PORT e WHERE c.ip_node_no = b.ip_node_no AND c.device_port_id = e.device_port_id AND e.device_id = d.device_id AND d.device_name LIKE 'something'; </code></pre> <p>How do i do this with my django models?</p>
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    1. PTQuestion
    1. USyee379
    1. USyee379
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    1. COOkay, amuse me. *Why* don't you want it to use an `INNER JOIN`?
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      1. POdon't want inner joins on django models
      1. USIgnacio Vazquez-Abrams
    2. COYou can always execute your own SQL statements instead of letting the ORM dictate the statement used: https://docs.djangoproject.com/en/1.3/topics/db/sql/
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      1. POdon't want inner joins on django models
      1. USBrandon
 

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