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Snippets by marinho

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AlphabeticFilterSpec

**WARNING: a better version of this snippet you can see at [http://www.djangosnippets.org/snippets/1051/](http://www.djangosnippets.org/snippets/1051/)** This filter spec is util only for who uses newforms-admin branch. To use this, you need to extend the class ModelAdmin for your model class, like the MyClassAdmin class in the code, with attention to the following lines: # Appends the filter cl.filter_specs.insert(0, AlphabeticFilterSpec(cl.lookup_opts.get_field('name'),request,cl.params,self.model,self))

  • filter
  • admin
  • alphabetic
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Protect anti robots template tag

This code works like that in the Google Groups you see and when try to see an e-mail and it is like this "[email protected]" with a link to write a captcha code and see the true value. You can use it for anything you want: links, blocks of texts, block of HTML, etc. To use in your template, place the a code like this (remember to load the template tags file with a {% load file_name %} before): {% protectantirobots %} <a href="mailto: {{ office.email }}">{{ office.email }}</a> {% endprotectantirobots %} You can also use **django-plus** application to do this: [http://code.google.com/p/django-plus/](http://code.google.com/p/django-plus/)

  • captcha
  • security
  • protect
  • anti
  • robots
  • safe
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render_to_json

**Explanation:** I think this shortcut can be util for who uses JSON many times and does not want to write same code everytime. **Setup:** Saves the snippet as `myproject/utils.py` or add the code to some place in your project with same ends. **Use in a view:** from myproject.utils import render_to_json from django.contrib.admin.models import User def json_view(request): admin_user = User.objects.get(username='admin') return render_to_json( 'json/example.json', locals(), ) **Update:** This code can be used as complement to [http://www.djangosnippets.org/snippets/154/](JsonResponse snippet) too.

  • template
  • json
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Date/time util template filters

**Explanations:** - the series "is_*_of" was created 'cos it's easier write: `{% if 10|is_day_of:date and user %}` than write: `{% ifequal date.day 10 %}{% if user %}...` - the series "inc/dec" is not complete, but can the extended to day, hour, minute, etc as you needs. It's util to inc 10 months since 05/31/2006 by example and get a 2007's date :) **Setup:** Insert the snippet into an_app/templatetags/datetimeutils.py. **Use in template:** `{% load datetimeutils %}` and use filters as following: - `{{ 30|is_day_of:a_date_time_variable }}` - `{{ 11|is_month_of:a_date_time_variable }}` - `{{ 2006|is_year_of:a_date_time_variable }}` - `{{ 58|is_minute_of:a_date_time_variable }}` - `{{ 23|is_hour_of:a_date_time_variable }}` - `{{ a_date_time_variable|dec_year:2 }}` - `{{ a_date_time_variable|dec_month:2 }}` - `{{ a_date_time_variable|inc_year:2 }}` - `{{ a_date_time_variable|inc_month:2 }}`

  • date
  • time
  • template-filters
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Aggregation class "Sum" with Case

Just use it like below: from downloaded_file import SumCase MyClass.objects.aggregate( sum1=SumCase('salary', case='salary < 4', when=True), sum1=SumCase('salary', case='type', when='director'), )

  • annotate
  • aggregation
  • sum
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Real shuffle function

This function solve the issue of random.shuffle that is based only on randomized shuffling (that's not a real shuffling, because many times items returned aren't shuffled enough). This function make a randomized shuffle and after this loops long the list resorting to avoid two items with a same value in a given attribute. When shuffling is over and there are duplicates, they are leftover to the end (and you can remove them if you set 'remove_duplicates' to True) Run it in a separated file to see it in action.

  • shuffle
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Scalable and invalidateble cache_page decorator

This cache_page decorator can be used in replacement to Django's django.views.decorators.cache.cache_page. It resolves two problems: - invalidation (its cache key is not dependent of header nor request, then you can use model signals (or method 'put' in Google App Engine) to invalidate a URL or a list of them) - easier to scale (can be used at once memcached server by many differente servers) Feel free to show me where it can have problems or limitations. **Updated and improved a lot**

  • cache
  • decorator
  • invalidation
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Widget for Money values on Geraldo Reports

This is a widget for decimal/money/currency fields on **Geraldo Reports**. When you use Geraldo to write reports, decimal fields must be formatted using **get_value** lambda attribute, because ObjectValue doesn't know what mask you want to use. With this widget, you just copy it into a common use Python file, import into your reports file and use it replacing ObjectValue on elements for fields you must be formatted as money format. **Example:** from geraldo import Report, ReportBand, ObjectValue from utils.reports import DecimalObjectValue class ReportCustomers(Report): title = u'Customers List' page_size = A4 class band_detail(ReportBand): height = 0.5*cm elements = [ ObjectValue(attribute_name='id', top=0.1*cm), DecimalObjectValue(attribute_name='salary', left=26.2*cm, top=0.1*cm, format='%0.03f'), ]

  • geraldo
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Widget for DateTime values on Geraldo Reports

This is a widget for date/time fields on **Geraldo Reports**. When you use Geraldo to write reports, date/time fields must be formatted using **get_value** lambda attribute, because ObjectValue doesn't know what mask you want to use. With this widget, you just copy it into a common use Python file, import into your reports file and use it replacing ObjectValue on elements for fields you must be formatted as date/time format. **Example:** from geraldo import Report, ReportBand, ObjectValue, landscape from utils.reports import DateTimeObjectValue class ReportPhoneList(Report): title = u'Phone List' page_size = landscape(A4) class band_detail(ReportBand): height = 0.5*cm elements = [ ObjectValue(attribute_name='id', top=0.1*cm), DateTimeObjectValue(attribute_name='birth_date', left=26.2*cm, top=0.1*cm, format='%m/%d/%Y'), ]

  • geraldo
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RangeField and RangeWidget

These field and widget are util for to those fields where you can put a star and end values. It supports most of field types and widgets (tested with IntegerField, CharField and DateField / TextInput and a customized DateInput). **Example of use:** class FormSearch(forms.Form): q = forms.CharField(max_length=50, label=_('Search for')) price_range = RangeField(forms.IntegerField, required=False) **Example of use (with forced widget):** class FormSearch(forms.Form): q = forms.CharField(max_length=50, label=_('Search for')) price_range = RangeField(forms.IntegerField, widget=MyWidget)

  • forms
  • field
  • widget
  • range
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PermanentRedirectMiddleware

This is a simple middleware that redirects the exactly URL requested with the correct domain. It is useful when you have more than one domain (most of cases with "www." or IP) to access a website. To make it works, download the snippet file as the name "permanent_redirect.py" and add its path as the first item in MIDDLEWARE_CLASSES setting in settings.py. Later you must inform a setting called `HTTP_HOST_DOMAIN` with the correct domain.

  • middleware
  • redirect
  • permanent
  • seo
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order_by template filter

put this code into a file in a folder "templatetags" inside some application and use it like this: {% load your_file_name %} {% for item in your_list|order_by:"field1,-field2,other_class__field_name"

  • template
  • filter
  • orderby
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Little middleware that create a facebook user

**How to use**: 1. Install [**PyFacebook** package](http://wiki.developers.facebook.com/index.php/PythonPyFacebookTutorial). 2. After make all steps in tutorial above, put this code in your app's models.py module (you maybe prefer split it and put the middleware class in some other file). 3. Put the FacebookUserMiddleware python-path in the MIDDLEWARE_CLASSES in your settings.py (after facebook.djangofb.FacebookMiddleware). You probably will add some fields to FacebookUser model class :)

  • middleware
  • user
  • facebook
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Pattern to integer list function

This function can be util for transform pattern strings like these to list: >>> pattern_to_list('42-45') [42, 43, 44, 45] >>> pattern_to_list('15,49-52') [15, 49, 50, 51, 52] >>> pattern_to_list('0-13') [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13] You can use also the list to pattern function at [http://www.djangosnippets.org/snippets/496/](http://www.djangosnippets.org/snippets/496/)

  • list
  • integer
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