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  • Show a django relationship in a template

    - by kevin_82
    I have a django model as follows: class Person(models.Model): name = models.CharField(max_length=255) class Relationship(models.Model): parent = models.ForeignKey(Person) child = models.ForeignKey(Person) description = models.TextField(blank=True) In my view, I pass a certain person, and the relationships in which he/she is parent: person = Person.objects.filter(name ='some name') descendant_relationships = Relationship.objects.filter(parent = person) An I want to show this person's descendants in a list in a template: <ul> {% for item in descendant_relationships%} <li> {{item.child.name}} - {{item.description}} </li> {% endfor %} </ul> But this template code will not show the children of children (i.e. grandchildren, great-grandchildren etc.). How can I get these lower level descendants to show up? I imagine recursion is necessary somewhere, but where?

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  • Django - Expression based model constraints

    - by rtmie
    Is it possible to set an expression based constraint on a django model object, e.g. If I want to impose a constraint where an owner can have only one widget of a given type that is not in an expired state, but can have as many others as long as they are expired. Obviously I can do this by overriding the save method, but I am wondering if it can be done by setting constraints, e.g. some derivative of the unique_together constraint WIDGET_STATE_CHOICES = ( ('NEW', 'NEW'), ('ACTIVE', 'ACTIVE'), ('EXPIRED', 'EXPIRED') ) class MyWidget(models.Model): owner = models.CharField(max_length=64) widget_type = models.CharField(max_length = 10) widget_state = models.CharField(max_length = 10, choices = WIDGET_STATE_CHOICES) #I'd like to be able to do something like class Meta: unique_together = (("owner","widget_type","widget_state" != 'EXPIRED')

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  • django-avatar: cant save thumbnail

    - by Znack
    I'm use django-avatar app and can't make it to save thumbnails. The original image save normally in my media dir. Using the step execution showed that error occurred here image.save(thumb, settings.AVATAR_THUMB_FORMAT, quality=quality) I found this line in create_thumbnail: def create_thumbnail(self, size, quality=None): # invalidate the cache of the thumbnail with the given size first invalidate_cache(self.user, size) try: orig = self.avatar.storage.open(self.avatar.name, 'rb') image = Image.open(orig) quality = quality or settings.AVATAR_THUMB_QUALITY w, h = image.size if w != size or h != size: if w > h: diff = int((w - h) / 2) image = image.crop((diff, 0, w - diff, h)) else: diff = int((h - w) / 2) image = image.crop((0, diff, w, h - diff)) if image.mode != "RGB": image = image.convert("RGB") image = image.resize((size, size), settings.AVATAR_RESIZE_METHOD) thumb = six.BytesIO() image.save(thumb, settings.AVATAR_THUMB_FORMAT, quality=quality) thumb_file = ContentFile(thumb.getvalue()) else: thumb_file = File(orig) thumb = self.avatar.storage.save(self.avatar_name(size), thumb_file) except IOError: return # What should we do here? Render a "sorry, didn't work" img? maybe all I need is just some library? Thanks

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  • Adding custom fields to users in django

    - by Gaurav
    I am the create_user() function that Django provides to create my users. Also I want to store additional information about the users. So I tried following the instructions given at http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users but I cannot get it to work for me. Is there a step-by-step guide that I can follow to get this to work for me? Also, once I have added these custom fields, I would obviously need to add / edit / delete data from them. I cannot seem to find any instructions on how to do this.

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  • Resizing uploaded images based on a maximum width in django (PIL)

    - by AndrewE
    I'm working on a simple message board app in Django that lets people upload images to be displayed in their posts. Since the div containing the posts is only 700px, I want to resize the uploaded images to a max width of something like 680px to save space rather than using css to display an image that's too large within the space constraints. I've been searching this site, google and the PIL docs for a while and haven't found any way of resizing an image on one dimension while maintaining the original aspect ratio. Given my inexperience, it's possible that I'm just not recognizing a solution that's plain to someone who knows what to look for.

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  • django image managment

    - by Andrey
    I'am new in django. In my project I'am working with images. I don't know how to organize the management of images. I need to dynamically upload the pictures and resize them. First question - what is the best way to dynamically upload images with progress bar and without flash? I found this and this, but I believe there is a better way. Second question. I have to save one image in different sizes. I won't use these thumbnails on my pages, but another application will. Many clients could upload images at the same time. This means that I can not resize all the images at the same time. How should I organize this process? Is there are a better ready-to-use solution for image management issue?

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  • Building a financial app with Django

    - by mfalcon
    Hi guys, I'm building an app for a small business so I've to work with currencies, decimal numbers, etc... My goal is to create something like pulseapp.com. I've searched for opensource projects to look and the only thing I had found was django-cashflow. This app uses python-money. I've read some of the code and the ways it's coded seems a bit weird to me and it's not fully complete. Is the app worth to take a deep look? Does anyone know about another similar app? Is the task difficult or a begginer like me could find a way to code it himself?

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  • Class views in Django

    - by Sebastjan Trepca
    Django view points to a function, which can be a problem if you want to change only a bit of functionality. Yes, I could have million keyword arguments and even more if statements in the function, but I was thinking more of an object oriented approach. For example, I have a page that displays a user. This page is very similar to page that displays a group, but it's still not so similar to just use another data model. Group also has members etc... One way would be to point views to class methods and then extend that class. Has anyone tried this approach or has any other idea?

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  • creating events in my classes, and allowing others to hook into them in my django app

    - by Blankman
    I want to create events for my classes. Say I create a CMS application that has a Article object. I create events like: OnEdit OnCreate OnDelete PreCreate PreDelete Now I want someone to be able to hook into these events, and add their custom functionality at each event they wish. I don't want them touching the core source code, so they would have to wire these custom methods to fire somewhere else. I'm new to both python and django so please be as detailed as possible if you can.

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  • Why is Django sending the wrong email template?

    - by Mark
    I'm so baffled... I keep staring at this code, looking for the typo, but I can't find it! template = 'emails/transporter_joined' tt = loader.get_template(template+'.txt') c = Context({'user':user, 'fee': settings.FEE * Decimal('100.00'),'settings':settings}) e = EmailMultiAlternatives('Activate Your Account', tt.render(c), '[email protected]', [user.email]) try: ht = loader.get_template(template+'.html') e.attach_alternative(ht.render(c), 'text/html') except: pass e.send() First it should load the 'emails/transporter_joined.txt' template, and adds that to the email. And then it tries to load a '.html' version and attaches that too. In Gmail you can see the the "original email" with both emails, and all the headers in plain text. It very clearly shows the .txt version twice. the .html and .txt files are definitely different. What am I doing wrong here? If I replace this tt = loader.get_template(template+'.txt') With .html instead, then it sends the .html twice... it must be Django that's screwing up, no?

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  • Django store regular expression in DB which then gets evaluated on page

    - by John
    Hi, I want to store a number of url patterns in my django model which a user can provide parameters to which will create a url. For example I might store these 3 urls in my db where %s is the variable parameter provided by the user: www.thisissomewebsite.com?param=%s www.anotherurl/%s/ www.lastexample.co.uk?param1=%s&fixedparam=2 As you can see from these examples the parameter can appear anywhere in the string and not in a fixed position. I have 2 models, one holds the urls and one holds the variables: class URLPatterns(models.Model): pattern = models.CharField(max_length=255) class URLVariables(models.Model): pattern = models.ForeignKey(URLPatterns) param = models.CharField(max_length=255) What would be the best way to generate these urls by replacing the %s with the variable in the database. would it just be a simple replace on the string e.g: urlvariable = URLVariable.objects.get(pk=1) pattern = url.pattern url = pattern.replace("%s", urlvariable.param) or is there a better way? Thanks

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  • Sending emails from Django App

    - by Will M.
    We are a growing Django app that is currently using Google Apps to send email. We are hitting the maximum limits of email sending and need a better solution. We prefer not to have to manage our own email servers and the easier the better. What is the best, easiest, and cheapest way to send a large amount of email? We have looked at Postageapp but they require you to use your own SMTP server. We are considering App Engine to send email but it will require a lot of configuration to get it to work correctly. What can we use to quickly fix this problem?

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  • php vs python django or something else for CMS module

    - by Michael
    We're looking to develop a CMS module for our website and I need some help in choosing the language/framework for this project. Basically we need to develop a "help' module like this one from ebay http://pages.ebay.com/help/index.html which will contain a lot of static pages with nice URLs for SEO. The application must run fast using low computer resources. We have been looking to use php on a custom made mvc framework but we received advice from other sources that py/django is the exactly language/framework that we need in terms of maintainability and development speed because it was developed for exactly this kind of projects so I need an expert advice on this matter with pro and cons for each choice.

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  • Utilizing a third party application for GitHub in a django project

    - by Smock
    I'm trying to use a third party application located here: git://github.com/Star2Billing/django-audiofield.git I'm using Aptana Studio as my IDE. I created my project and then I clicked on the project and imported the app from the github location. It looked like it imported. I wanted to check that it imported properly before beginning any real coding so I performed manage.py validate. I got a message that stated: "No module named audiofield". I added the app to my Installed Apps settings and followed the installation instructions. I'm not sure if I'm importing it incorrectly. Also, I'm using virtualenv in Aptana. I'm not sure if this may have added to the problem. Please help.

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  • Search box inside a div. Django

    - by Juliette Dupuis
    In my django app I display a list of elements (friends name) thanks to a loop: <div> {% for friend in group %} <p>{{ friend.name }} <p> {% endfor %} </div> I would like to create a search box on the top of my list in order to be able to find only the friends the user wants. I would like the search bar does not need to click to send the request (an example is the Airtime searchbox on top of the facebook friends list). I have absolutely no idea on how to do that, and I'm looking for hints or tips to start. Thank you very much for your help.

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  • Close TCP port 80 and 443 after forking in Django

    - by audiodev
    I am trying to fork() and exec() a new python script process from within a Django app that is running in apache2/WSGI Python. The new python process is daemonized so that it doesn't hold any association to apache2, but I know the HTTP ports are still open. The new process kills apache2, but as a result the new python process now holds port 80 and 443 open, and I don't want this. How do I close port 80 and 443 from within the new python process? Is there a way to gain access to the socket handle descriptors so they can be closed?

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  • Daily tech links for .net and related technologies - Apr 26-28, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Apr 26-28, 2010 Web Development MVC: Unit Testing Action Filters - Donn ASP.NET MVC 2: Ninja Black Belt Tips - Scott Hanselman Turn on Compile-time View Checking for ASP.NET MVC Projects in TFS Build 2010 - Jim Lamb Web Design List of 25+ New tags introduced in HTML 5 - techfreakstuff 15 CSS Habits to Develop for Frustration-Free Coding - noupe Silverlight, WPF & RIA Essential Silverlight and WPF Skills: The UI Thread, Dispatchers, Background...(read more)

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  • Daily tech links for .net and related technologies - Mar 29-31, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Mar 29-31, 2010 Web Development Querying the Future With Reactive Extensions - Phil Haack Creating an OData API for StackOverflow including XML and JSON in 30 minutes - Scott Hanselman MVC Automatic Menu - Nuri Halperin jqGrid for ASP.NET MVC - TriRand Team Foolproof Provides Contingent Data Annotation Validation for ASP.NET MVC 2 -Nick Riggs Using FubuMVC.UI in asp.net MVC : Getting started - Cannibal Coder Building A Custom ActionResult in MVC...(read more)

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  • Daily tech links for .net and related technologies - Apr 5-7, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Apr 5-7, 2010 Web Development HTML 5 is Born Old - Quake in HTML 5 Example Image Preview in ASP.NET MVC - Imran Advanced ASP.NET MVC 2 - Brad Wilson How to Serialize/Deserialize Complex XML in ASP.Net / C# - Impact Works Ban HTML comments from your pages and views - Bertrand Le Roy Measuring ASP.NET and SharePoint output cache - Gunnar Peipman Web Design Eye Candy vs. Bare-Bones in UI Design - Max Steenbergen Empathizing Color Psychology in Web...(read more)

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  • Daily tech links for .net and related technologies - Mar 26-28, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Mar 26-28, 2010 Web Development Creating Rich View Components in ASP.NET MVC - manzurrashid Diagnosing ASP.NET MVC Problems - Brad Wilson Templated Helpers & Custom Model Binders in ASP.NET MVC 2 - gshackles The jQuery Templating Plugin and Why You Should Be Excited! - Chris Love Web Deployment Made Awesome: If You're Using XCopy, You're Doing It Wrong - Scott Hansleman Dynamic User Specific CSS Selection at Run Time - Misfit Geek Sending email...(read more)

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  • Daily tech links for .net and related technologies - Apr 15-18, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Apr 15-18, 2010 Web Development Guarding against CSRF Attacks in ASP.NET MVC2 - Scott Kirkland Same Markup: Writing Cross-Browser Code - Tony Ross Introducing Machine.Specifications.Mvc - James Broome ASP.NET 4 - Breaking Changes and Stuff to be Aware of - Scott Hanselman JSON Hijacking in ASP.NET MVC 2 - Matt Easy And Safe Model Binding In ASP.NET MVC - Justin Etheredge MVC Portable Areas Enhancement - Embedded Resource Controller - Steve Michelotti...(read more)

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  • Daily tech links for .net and related technologies - May 26-29, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - May 26-29, 2010 Web Development Porting MVC Music Store to Raven: StoreController - Ayende Building a Store Locator ASP.NET Application Using Google Maps API - Scott Mitchell Anti-Forgery Request Recipes For ASP.NET MVC And AJAX - Dixin How to Localize an ASP.NET MVC Application - Michael Ceranski Tekpub ASP.NET MVC 2 Starter Site 0.5 Released - Rob Conery How to use Google Data API in ASP.NET MVC. Part 2 - Mahdi jQuery.validate and Html.ValidationSummary...(read more)

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  • Daily tech links for .net and related technologies - Apr 8-10, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Apr 8-10, 2010 Web Development Using RIA DomainServices with ASP.NET and MVC 2 - geekswithblogs Using AntiXss As The Default Encoder For ASP.NET - Phil Haack New Syntax for HTML Encoding Output in ASP.NET 4 (and ASP.NET MVC 2) - Scott Gu Multi-Step Processing in ASP.NET - Dave M. Bush MvcContrib - Portable Area – Visual Studio project template - erichexter Encoding/Decoding URIs and HTML in the .NET 4 Client Profile - Pete Brown Jon Takes Five...(read more)

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  • Daily tech links for .net and related technologies - Mar 23-25, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Mar 23-25, 2010 Web Development Introducing Browsers Providers in ASP.NET 4 - osbornm ASP.NET 4.0 Part 14, More Control Over Session State - hmobius Editable MVC Routes (Apache Style) - nberardi ASP.NET Performance Framework - karlseguin Web Design Techniques for Squeezing Images for All They’re Worth - Walter 12 Useful and Free Downloadable Web Design Books - SpeckyBoy Getting Started with Xcode IDE for iPhone Development - keyvan Grid Accordion...(read more)

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  • Daily tech links for .net and related technologies - Mar 18-21, 2010

    - by SanjeevAgarwal
    Daily tech links for .net and related technologies - Mar 18-21, 2010 Web Development TDD kata for ASP.NET MVC controllers (part 2) -David Take Control Of Web Control ClientID Values in ASP.NET 4.0 - Scott Mitchell Inside the ASP.NET MVC Controller Factory - Dino Esposito Microsoft, jQuery, and Templating - stephen walther Cross Domain AJAX Request with YQL and jQuery - Jeffrey Way T4MVC Add-In to auto run template -Wayne Web Design Website Content Planning The Right Way - Kristin Wemmer Microsoft...(read more)

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