Say that I inherited the model's legacy as defined below.
ArticleBase (Models.Model): title = models.CharField () Author = models.CharField () Category Review: Rating = models.IntegerField () Class News (ArticleBase) : Source = models.CharField () If I need a list of all the articles, even if (in this case the order has been ordered in both the review and the news), I ArticleBase Once I can run a query, I have a paragraph base record to determine whether it asks both questions of a model. Received related to a review or news records, foreign keys which have recorded?
I am assuming that all paragraph examples are examples of article subsection subclasses.
A solution is to collect subclass names in ArticleBase and some methods that return the subclass or subclass objects based on that information. Since multi-table succession defines an asset at the original frequency to reach a child's example, it is all very straight forward. Paragraph Base (models.Model) from the category of Django.db import models:
= Models.CharField () Author = models.CharField () # Store the name of the actual class. Class_name = models.CharField () # Define that the class_name is set to ensure it is saved. Def Save (self, * args, ** quorz): self.class_name = self .__ class______________ super (paragraph, self). Savings (* Args, ** kwargs) # Multi-table succession defines a specialty to bring the child to the # short case Sub-class named Def get_child (self): Return getattr (self, self. Class_name.lower ()) #If actually you really need the class. Def get_child_class (self): back self .get_child () .__ class__ # Check the type against a subclass name or subclass # For example, 'if the article Child_IS (News): '# or' if article. Child_is ("news"): '. Def child_is (self, cls): ifinstance (cls, bassstring): return cls.lower () == self.class_name.lower () Other: return self.get_child_class () == CLS class review (ArticleBase): Rating = Models.IntegerField () Class News: Article source = models.CharField () </code> </pre> <p> This is not the only way to go about this. This, however, is a very simple and straight forward solution. Excellent stuff content type applications and generic modules that take advantage of it, they offer a variety of ways to do this, well, normally. </p> <p> This article can be useful for the following in Base: </p> <pre> <code> def __unicode __ (self) returns self.get_child () .__ Unicode __ () </code> </pre> <p> In that case, be aware that the failure to define <code> __unicode __ </code> in sub-codes, or on an event of ArticleBase (one that has not been subclassed) <code > __Unicode __ </code> calling will lead to an infinite recursion, thus following advice, discretion check (for example, directly in this way the RTIs An immediate stop) </p> <p> <strong> Disclaimer: </strong> </p> <p> This code is unwanted, I 'm convinced that there is a typo or two in it, but the original concept should be sound. There should be some flawed check in the production level code so that usage errors can be stopped. </p> </div> </html> <br />
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<a href='https://dos2unixcode11.blogspot.com/2013/03/'>March 2013<span class='post-count'>587</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2013/02/'>February 2013<span class='post-count'>596</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2013/01/'>January 2013<span class='post-count'>572</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/09/'>September 2012<span class='post-count'>617</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/08/'>August 2012<span class='post-count'>590</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/07/'>July 2012<span class='post-count'>555</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/06/'>June 2012<span class='post-count'>571</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/05/'>May 2012<span class='post-count'>584</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/04/'>April 2012<span class='post-count'>577</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/03/'>March 2012<span class='post-count'>625</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/02/'>February 2012<span class='post-count'>592</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2012/01/'>January 2012<span class='post-count'>582</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/09/'>September 2011<span class='post-count'>539</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/08/'>August 2011<span class='post-count'>580</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/07/'>July 2011<span class='post-count'>608</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/06/'>June 2011<span class='post-count'>619</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/05/'>May 2011<span class='post-count'>566</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/04/'>April 2011<span class='post-count'>586</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/03/'>March 2011<span class='post-count'>572</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2011/02/'>February 2011<span class='post-count'>566</span></a>
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<li class='archivedate'>
<a href='https://dos2unixcode11.blogspot.com/2011/01/'>January 2011<span class='post-count'>587</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/09/'>September 2010<span class='post-count'>603</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/08/'>August 2010<span class='post-count'>607</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/07/'>July 2010<span class='post-count'>581</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/06/'>June 2010<span class='post-count'>574</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/05/'>May 2010<span class='post-count'>574</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/04/'>April 2010<span class='post-count'>563</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/03/'>March 2010<span class='post-count'>601</span></a>
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<a href='https://dos2unixcode11.blogspot.com/2010/02/'>February 2010<span class='post-count'>552</span></a>
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<li class='archivedate'>
<a href='https://dos2unixcode11.blogspot.com/2010/01/'>January 2010<span class='post-count'>583</span></a>
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