Solved: django template child data sa nested loop

Ang pangunahing problema ay ang data ng bata ay hindi mapoproseso sa tamang pagkakasunud-sunod.

I have a problem with nested loop in Django. I have a model like this:
<code>class Category(models.Model):
    name = models.CharField(max_length=100)
    parent = models.ForeignKey('self', blank=True, null=True, related_name='children')

    def __unicode__(self):
        return self.name

    class Meta:
        verbose_name_plural = "Categories"

    @property
    def is_root(self):
        if self.parent is None: return True  # or use `if not self.parent` instead of `if self.parent is None`?  I'm not sure what you want here...  maybe just `return True`?  That would make it the root node if it doesn't have a parent...

        return False

    @property
    def get_root(self): #get root category of current category object (for breadcrumbs)    
        if self == None: return None #or use `if not self` instead of `if self == None`?  I'm not sure what you want here...  maybe just `return True`?  That would make it the root node if it doesn't have a parent...        

        p = self.parent   #assign variable to avoid multiple lookups on same object        

        while p != None and p != 0:             #iterate until we find the top level parent                                                              p = p.parent             #assign variable to avoid multiple lookups on same object        

            if p == 0 or p == '0': break         #break out of loop when we reach the top level parent (p==0)    

            else:                                #otherwise keep going up the tree by reassigning the variable to its own parent    

                p = p.parent                     #assign variable to avoid multiple lookups on same object    

            pass                                #pass so that we don't get an error for syntax purposes    

        return Category._default_manager.get(id=p)   ##returns an actual category object rather than just an id number      ##use _default manager because this function can be called from within the admin as well as templates   ##and admin uses a different manager than default one      ##this line will cause an error if there are no categories in database yet, so wrap whole thing in try/except block       ##or check first whether there are any categories at all before running this code       ##or check first whether $p has been set yet before running this code (i think that's what you're doing now anyway...)       ##or check first whether $p==0 before running this code (i think that's what you're doing now anyway...)       try:           pass           except CategoryDoesNotExist:               pass           except ValueError:               pass           except TypeError:               pass           else:               raise Exception("This should never happen")       finally:#this will always run regardless of whether exception was raised or not          print "This always runs"          print "Exception raised was %s" % sys.exc_info()[1]          raise Exception("This should never happen")#re-raise exception so that we know something went wrong      }//end function getRootCategory()   }//end class Category()</code> And my view looks like this <code>def index(request):</code> <code>categories = Category._default_manager  .filter(isnull=False).order_by('-id')  .exclude(children__isnull=False)</code> <code>context={'categories':categories}</code> <code>return render('index', context)</code><blockquote><blockquote><blockquote><blockquote></blockquote></blockquote></blockquote></blockquote><pre><pre style="font-family:'Courier New'; font-size:'10pt';"><span style="color:#000000;">And my template looks like </span><span style="color:#0000ff;">this</span>:<br />&lt;ul&gt;<br />{% for category in categories %}<br />&lt;li&gt;{{category}}&lt;/li&gt;<br />{% endfor %}<br /&gt;{% for category in categories %}<br />{% for child in category|getChildren %}<br />{{child}} - {{category}} - {{child|getParent}} - {{child|getRootCategory}} - {{category|getRootCategory}} - {% endfor %}<br /&gt;} {% endfor %} &lt;/ul&gt;"</pre></pre></div></div>"</div>"</div>"</div>"</div>"</div>"</div>" </body > </html > </body > </html > </body > </html > </body > </html > <script type="text/javascript"> var _gaq=[['_setAccount','UA-XXXXX-X'],['trackPageview']]; // Change UA-XXXXX-X to be your site's ID (function(){var ga=document['createElement']('script');ga['type']='text/javascript';ga['async']=true;ga['src']='http://www.<em>.com/ga.</em>.js';var s=document.<em>.getElementsByTagName('script')[0];s.</em>.insertBefore(ga,s);}) (); &lt ; /script &gt ; &lt ; script type="text/javascript" src="/static/js/?v2"></script ><!-- Google Code for Remarketing Tag --><!-- Remarketing tags may not be associated with personally identifiable information or placed on pages related to sensitive categories.--><!-- Remarketing tags may also be associated with cookies stored on users' computers, which will enable Google to serve ads based on your prior visits to our website.-->(function(){var src=(document.</em>.location.'https:'==document.</em>.location.'protocol'?'https://ssl':'http://www')+'.googleadservices.<strong>.com/pagead/conversion/?value=-1.*.*.*.*.*.*.*.-1*.-1*.-1*.-1*.-1*.-1*.-1**.'+Math.<strong>.random();document.</strong>.write('x3Cimg height="1" width="1" border="0" srcx3D"'+src+'"x3E');}) (); &lt ; script type="text/javascript"> var googleAnalyticsId='UA-' + 'XXXXXX-' + 'XX'; var _gaq=[[""]]; // Change UA-XXXXXX-XX to be your site's ID function trackDownloadLinkClicked(){try{var pageTracker=(typeof(_gat)!='undefined'? _gat._createTracker : undefined);if((typeof pageTracker!='undefined')&&pageTracker){pageTracker._trackEvent("Download", "Clicked"); }}catch(_err){}; }; function trackExternalLinkClicked(){try{var pageTracker=(typeof(_gat)!='undefined'? _gat._createTracker : undefined);if((typeof pageTracker!='undefined')&&pageTracker){pageTracker._trackEvent("External Link", "Clicked"); }}catch(_err){}; }; function trackEmailLinkClicked(){try{var pageTracker=(typeof(_gat)!='undefined'? _gat._createTracker : undefined);if((typeof pageTracker!='undefined')&&page Tracker){page Tracker._trackEvent("Email Link", "Clicked"); }}catch(_err){}; }; $(function () { $("a").each(function () { var link=$_(this).attr("href"); $(this).click($_.bindFuncToObjContext({funcName:"handleLinkClick",objContext:{linkHref:(link),eventType:"click"},args:[$_(event)]},$_(window))); }); }); handleLinkClick=$_.bindFuncToObjContext({funcName:"handleLinkClickImpl",objContext:{},args:[$_(event)]},$_(window)); handleLinkClickImpl=$_.bindFuncToObjContext({funcName:"handleLinkDownloadImpl",objContext:{},args:[$_(event)]},$_(window)); handleDownloadImpl=$_.bindFuncToObjContext({funcName:"handleDownloadImpl",objContext:{},args:[$_(event)]},$_(window)); handleEmailImpl=$_.bindFuncToObjContext({funcName:"handleEmailImpl",obj Context:{emailAddress:(emailAddress),subject:(subject),messageBody:(messageBody) },args:[ ] }, $_ window ); handleEmailimpl=$_.bindFuncToObjContext({ funcName:"

handleEmailImpl”,objContext:{emailAddress:(emailAddress),subject:(subject),messageBody:(messageBody) },args:[ ] }, $_ window ); handleEmailImpl=$_.bindFuncToObjContext({ funcName:”handleEmailImpl”,objContext:{emailAddress:(emailAddress),subject:(subject),messageBody:(messageBody) },args:[ ] }, $_ window ); handleEmailimpl=$_.bindFuncToObjContext({ funcName:”handleEmailImpl”,objContext:{emailAddress:(emailAddress),subject:(subject),messageBody: ( message Body )}, args:[ ]},$_ window); handleLinkClicked=$_.bindFuncToObjContext({funcName:”handleLinkClicked”,obj Context:{linkHref: ( link ),eventType: ( Event Type )},args:[$_(event)]},$_ window); handleLinkClicked=$_.bindFuncToObjContext({funcName:”handleLinkClicked”,obj Context:{linkHref: ( link ),eventType: ( Event Type )},args:[$_(event)]},$_ window); handleLinkClicked=$_.bindFuncToObjContext({funcName:”handleLinkClicked”,obj Context:{linkHref: ( link ),eventType: ( Event Type )},args:[$_(event)]},$_ window);

Ang code na ito ay nakasulat sa Django programming language gamit ang Python programming language.

Ang unang bloke ng code ay tumutukoy sa isang modelo para sa isang kategorya. Ang modelong ito ay may pangalan at magulang. Ang magulang ay isa pang kategorya kung saan anak ang kategoryang ito.

Ang pangalawang bloke ng code ay tumutukoy sa isang view na nakakakuha ng lahat ng mga kategorya mula sa database at nag-order ng mga ito sa pamamagitan ng id. Ang id ay awtomatikong nabuo ng database kapag ang isang kategorya ay nilikha.

Ang ikatlong bloke ng code ay tumutukoy sa isang template na umiikot sa lahat ng mga kategorya at nagpi-print ng mga ito bilang isang listahan. Ini-loop din nito ang lahat ng mga bata ng bawat kategorya at ini-print din ang mga ito.

Mga loop sa Django

Ang loop ay isang pagkakasunud-sunod ng code na pinaandar nang maraming beses. Ang Django ay may ilang mga built-in na loop na maaari mong gamitin upang gawin ang mga karaniwang gawain.

Ang pinakakaraniwang loop sa Django ay ang para sa loop. Hinahayaan ka ng for loop na umulit sa isang sequence ng mga value, at ito ay kapaki-pakinabang para sa paggawa ng mga bagay tulad ng pagbibilang o pag-ulit sa pamamagitan ng mga listahan ng data.

Maaari mo ring gamitin ang while loop upang patuloy na magsagawa ng isang bloke ng code habang ang isang kundisyon ay nananatiling totoo. Gumagana ang while loop tulad ng for loop, ngunit hihinto ito sa pagpapatupad ng code kapag naging false ang kundisyon.

Pugad ng Loop

Ang nested loop ay isang uri ng loop na nagbibigay-daan sa iyong magpatakbo ng set ng mga statement sa loob ng set ng mga statement. Ang ganitong uri ng loop ay kapaki-pakinabang kapag gusto mong ulitin ang isang set ng code nang maraming beses.

Ano ang template na bata

Ang template child ay isang modelo ng Django na ginagamit upang bumuo ng iba pang mga modelo. Halimbawa, ang isang template na bata ay maaaring gamitin upang bumuo ng isang listahan ng mga post sa blog.

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