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class Context(models.Model): 
    name = models.CharField(error_messages={'unique': u'My custom message'})

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def unique_error_message(self, model_class, unique_check):
    if model_class == type(self) and unique_check == ('field1', 'field2'):
        return 'Your custom error message.'
    else:
        return super(YourModel, self).unique_error_message(model_class, unique_check)

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from django.conf import settings


class JsonAsHTML(object):
    '''
    View a JSON response in your browser as HTML
    Useful for viewing stats using Django Debug Toolbar

    This middleware should be place AFTER Django Debug Toolbar middleware
    '''

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# install and select
sudo port install postgresql93-server
sudo port select --set postgresql postgresql93

# load at startup
sudo port load postgresql93-server

# create the default database
sudo mkdir -p /opt/local/var/db/postgresql93/defaultdb
sudo chown postgres:postgres /opt/local/var/db/postgresql93/defaultdb

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# install
sudo port install tomcat6

# add -Djava.awt.headless=true to /opt/local/share/java/tomcat6/bin/tomcatctl (line 65)
JAVA_OPTS="$JAVA_OPTS -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.awt.headless=true"

# without this you’ll get this error in /opt/local/share/java/tomcat6/logs/catalina.err:
# 2013-11-16 23:39:17.389 jsvc[1698:203] Apple AWT Java VM was loaded on first thread -- can't start AWT.
# Nov 16, 2013 11:39:17 PM org.apache.catalina.startup.Bootstrap initClassLoaders
# SEVERE: Class loader creation threw exception

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sudo npm -g install yuglify

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COMPRESS_YUGLIFY_BINARY = 'yuglify' # assumes yuglify is in your path
COMPRESS_YUGLIFY_CSS_ARGUMENTS = '--terminal'
COMPRESS_YUGLIFY_JS_ARGUMENTS = '--terminal'

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from compressor.conf import settings
from compressor.filters import CompilerFilter


class YUglifyFilter(CompilerFilter):
    command = "{binary} {args}"

    def __init__(self, *args, **kwargs):
        super(YUglifyFilter, self).__init__(*args, **kwargs)
        self.command += ' --type=%s' % self.type

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# Old
COMPRESS_CSS_FILTERS = ['compressor.filters.css_default.CssAbsoluteFilter', 'compressor.filters.yui.YUICSSFilter']

# New
COMPRESS_CSS_FILTERS = ['compressor.filters.css_default.CssAbsoluteFilter', 'app.compressor.filters.YUglifyCSSFilter']

# Old
COMPRESS_JS_FILTERS = ['compressor.filters.jsmin.SlimItFilter']

# New

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from __future__ import absolute_import

# This will make sure the app is always imported when
# Django starts so that shared_task will use this app.
from .celery import app