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import os, sys, pathlib # if script is in on 1 level deep # sys.path.append(str(pathlib.Path(__file__).parents[1].absolute())) sys.path.append(str(pathlib.Path(__file__).absolute())) os.environ.setdefault("DJANGO_SETTINGS_MODULE", "main.settings") import django django.setup() # import your django models # do your django work |
I was writing a service which import various feeds and then post to another RESTful API, simple enough as below:
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from django.db import connections class Receiver(PolymorphicModel): ... class Database(Receiver): name = models.CharField(max_length=255) def get_data_source(self): return connections[name] |
Then the feed model:
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class Feed(models.Model): receiver = models.ForeignKey('Receiver') def get_data_source(self): return self.receiver.get_real_instance().get_data_source() |
Then run this feed in trivial code:
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import threading function transform_listing(feed): cursor = feed.get_data_source().cursor() .... feed = Feed.objects.create(receiver=Database.objects.create(name='legacy')) for i in range(100): th = threading.Thread(transform_listing, [feed]) th.start() |
And you will quickly notice the threads complaining
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Too many connections |
What it’s happening is Django will create a new connection per thread… Read More »
A colleague of mine mentioned this site http://ccbv.co.uk/ which provides references and information about django class based views. Classy Class-Based Views. ccbv.co.uk The best way to understand Django’s class-based views is to see it in Classy CBV, so pick your version and jump in at the deep end.
A bit of background here about ForeignKey (many to one): If you have Order and OrderItem models, your order FK is in OrderItem model, from OrderItem model point of view, it’s Many OrderItem to One Order, in other words ManyToOne. What this implies is you need to have Order records before OrderItem records. Now, why… Read More »
Django Rest Framework is a very solid api framework, but it doesn’t provide out-of-box versioning mechanism, here is my attempt to implement version specific APIs. The goal is to achieve something like http://localhost:8000/api/(resource)/ http://localhost:8000/api/v1/(resource)/ plus allowing clients to specify the version in request header (X-Version), here is how we did it. Structure in side the… Read More »
Currently django-cms-search doesn’t support haystack 2.0 yet, so here is my modified version to work on haystack 2.0 based on
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import datetime from haystack import indexes from cms.models.managers import PageManager from cms.models.pagemodel import Page from cms.models.pluginmodel import CMSPlugin class PageIndex(indexes.SearchIndex, indexes.Indexable): text = indexes.CharField(document=True, use_template=False) pub_date = indexes.DateTimeField(model_attr='publication_date', null=True) login_required = indexes.BooleanField(model_attr='login_required') url = indexes.CharField(model_attr='get_absolute_url') title = indexes.CharField(model_attr='get_title') def prepare(self, obj): self.prepared_data = super(PageIndex, self).prepare(obj) plugins = CMSPlugin.objects.filter(placeholder__in=obj.placeholders.all()) text = '' for plugin in plugins: instance, _ = plugin.get_plugin_instance() if hasattr(instance, 'search_fields'): text += ''.join(getattr(instance, field) for field in instance.search_fields) text += obj.get_meta_description() or u'' text += obj.get_title() or u'' text += obj.get_meta_keywords() if hasattr(obj, 'get_meta_keywords') and obj.get_meta_keywords() else u'' self.prepared_data['text'] = text return self.prepared_data def get_model(self): return Page def index_queryset(self, using=None): return Page.objects.published().filter(publisher_is_draft=False).distinct() |
Don’t we all get confused by unicode encoding sometimes? Especially you wouldn’t expect this kind of error to happen in django admin. The problem is actually not in the admin section, the culprit is __unicode__ method in your model. when you have a unicode function like this:
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def __unicode__(self): return "{0}".format(self.field_one) |
It is actually returning a ASCII string(which… Read More »
I have a custom user model as below:
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class User(AbstractUser): subscribe_newsletters = models.BooleanField(default=True) old_id = models.IntegerField(null=True, blank=True) old_source = models.CharField(max_length=25, null=True, blank=True) |
And using the builtin UserAdmin
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admin.site.register(User, UserAdmin) |
While editing the user record works fine, but when I add a user, I get the following error
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Exception Value: relation "auth_user" does not exist LINE 1: ...user"."is_active", "auth_user"."date_joined" FROM "auth_user... |
After some digging around and found this https://docs.djangoproject.com/en/1.5/topics/auth/customizing/#custom-users-and-the-built-in-auth-forms The culprit is a function clean_uesrname inside UserCreationForm inside django.contrib.auth.forms.py A few tickets… Read More »
I think it’s necessary to create a video to demonstrate how quickly web application development can be. Enjoy!
We have been working on a python/django project which is SOA oriented, all sites(systems) are internal and communications are done via http restful api requests. Our setup share the same set of memcache servers to cache data individually on each sub site(system). Often when site A wants data from site B, site A makes a… Read More »