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POhelp using django's ORM for UNION query
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  1. POhelp using django's ORM for UNION query
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    copied!<p>i am making a history page for a website. The structure of my classes is something like this:</p> <p><img src="https://i.stack.imgur.com/gr6sV.png" alt="alt text"></p> <pre><code>class Person(models.Model): name = models.CharField(max_length=100) type = models.CharField(max_length=30) class History(models.Model): date = models.DateField(max_length=100) action = models.CharField(max_length=250) person = models.ForeignKey(Person) class Parent(Person): #some attributes that are not relevant class Son(Person) parent = models.ForeignKey(Parent) #other attributes that are not relevant </code></pre> <p>its quite simple... i have a <strong>Parent</strong> that has multiple <strong>Sons</strong> both can do <strong>actions</strong> on the website and they are all saved in the History table that has a reference to the Person that executed the action. The history table is something like:</p> <pre><code>date | action | person_id ---------------------------------------- 16-12-2010 | saved profile | 1 16-12-2010 | new child | 2 </code></pre> <p>for a Parent i need to display all his actions and the action of his sons Using sql it would be:</p> <pre><code>SELECT * FROM History where person_id=1 UNION SELECT h.* FROM History h JOIN Son s ON s.person_ptr_id=h.person_id WHERE s.parent_id=1 </code></pre> <p>but i have no idea how to do that using django's ORM. Myabe using two querys? a loop? Do you have any ideas? i'd really appreciate some help.. thanks in advance</p> <p>BTW: i'm using django 1.1</p> <p><strong>EDIT:</strong> i added the attributes in the classes. These are just examples, my tables have more attributes, but this is how django translate the relations into tables</p>
 

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