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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After selecting the copies of the buffer in Linux, after the text, we can click and paste the button between the mouse. I think there is a special buffer for this, I want to use it. Programming Language: C ++ Your Library: Qt Thanks. There is just one more correct answer than Paul Dixon, which answers your needs: / P > QClipboard * clipboard = QApplication :: clipboard (); CastString Selected Text = Clipboard-> Text (QClipboard :: Selection);
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I am trying to install Ubuntu on a USB, the problem is that I do not want to repeat the boot once, I want to keep my windows, but I want to boot Ubuntu using the virtualbox and USB to the Ubuntu Want to use my hard drive, but how? The virtualbox will not recognize USB as a hard drive when installing an ISO In virtualbox, you have to create a virtual hard disk. Make a USB drive and tell the virtual box to install a virtual hard drive that you just created. EDIT: To answer some more questions: In the new Virtual Disk dialog, click the button next to the location field, click on the button Virtual Disk on Flash Drive To access, click the arrow next to Save in the Select File in the window next to Save In, and you can access your flash drive from there. I recommend setting the image to be allocated dynamically, because the size of your flash drive is not available disk space. I name the image, then select that image to install Ubuntu in the Verbill box. The virtualbox will never...
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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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<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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<a href='https://dos2unixcode11.blogspot.com/2010/01/'>January 2010<span class='post-count'>583</span></a>
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