Unable to get started

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Hello,

I see on the Internet that other people have mptt working, but I am having
trouble getting off the ground.  I have this model with a 'self' field. 

class Characterizations(models.Model):
    parent=models.ForeignKey(
        'self',
        null=True,
        blank=True,
        db_index=True,
        help_text="Parent of node in tree") 
    dimen=models.ForeignKey(
        Dimen,
        related_name='characterizations_fk_dimen',
        null=True,
        blank=False,
        db_index=True,
        help_text="Dimension of characterization") 
    title=models.CharField(
        max_length=72,
        null=False,
        blank=True,
        db_index=False,
        help_text="Title of this node (short)") 
    description=models.CharField(
        max_length=72*24,
        null=False,
        blank=True,
        db_index=False,
        help_text="Description of this node (a paragraph)") 

After installing mptt, at the top of models.py, right below "from django.db
import models" I added

  import mptt

and I added 'mptt' to INSTALLED_APPS in settings.py.

Below the model I added

  mptt.register(Characterizations, order_insertion_by='title')

and I try to run.  I drop all tables (I have a command "psql -a -f
dropTables.sql az" for that).  Then I run 

  /usr/local/bin/python manage.py reset --noinput pkgs

and I get the error (entire traceback at bottom):  

File "/usr/local/lib/python2.5/site-packages/mptt/__init__.py", line 73, in
register
    dispatcher.connect(pre_save, signal=model_signals.pre_save, sender=model)
AttributeError: 'module' object has no attribute 'connect'

Indeed, there is no connect() call at the top level in
django/dispatch/dispatcher.py .  I see there a class Signal which itself
has a connect() call, but in mptt/__init__.py I don't see that Signal is
ever instantiated.

I just updated django out of svn a few minutes ago and it shows the same
behavior.  I downloaded mptt version 0.2.1 this morning.  I am running
Ubuntu (maybe Hardy Heron, but I have Python 2.5 which is why I call it out
of /usr/local/bin).

I'd be glad for any tips.  (I'd also be glad to show any and all code if
that would help, of course.) 

Thanks,
Jim Hefferon

...............................................................
  Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(settings)
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/__init__.py",
line 340, in execute_manager
    utility.execute()
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/__init__.py",
line 295, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/base.py",
line 195, in run_from_argv
    self.execute(*args, **options.__dict__)
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/base.py",
line 221, in execute
    self.validate()
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/base.py",
line 249, in validate
    num_errors = get_validation_errors(s, app)
  File
"/usr/local/lib/python2.5/site-packages/django/core/management/validation.py",
line 28, in get_validation_errors
    for (app_name, error) in get_app_errors().items():
  File
"/usr/local/lib/python2.5/site-packages/django/db/models/loading.py", line
128, in get_app_errors
    self._populate()
  File
"/usr/local/lib/python2.5/site-packages/django/db/models/loading.py", line
57, in _populate
    self.load_app(app_name, True)
  File
"/usr/local/lib/python2.5/site-packages/django/db/models/loading.py", line
72, in load_app
    mod = __import__(app_name, {}, {}, ['models'])
  File "/var/www/az/development/az/pkgs/models.py", line 710, in <module>
    mptt.register(Characterizations, order_insertion_by='title')
  File "/usr/local/lib/python2.5/site-packages/mptt/__init__.py", line 73,
in register
    dispatcher.connect(pre_save, signal=model_signals.pre_save, sender=model)

Original issue reported on code.google.com by jim.heff...@gmail.com on 29 Nov 2008 at 1:32

[GoogleCodeExporter]

Old django, probably. They have signals refactored 2 months ago.

Original comment by mocksoul on 6 Dec 2008 at 12:27

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[deleted comment]

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Thanks, but I run django from the svn and I have tried it with a number of 
recent
versions.

Original comment by jim.heff...@gmail.com on 9 Dec 2008 at 1:28

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I'm having the same issue here, running Django 1.0.1 final. The cause of this 
issue
is the removal of some old deprecated methods in the dispatcher, see Django 
changeset
#8291.

http://code.djangoproject.com/changeset/8291

Original comment by Jonatan....@gmail.com on 20 Dec 2008 at 8:59

[GoogleCodeExporter]

I had the same issue, but after banging my head against a wall for a few hours 
I came
up with a solution that worked for me (on a linux box).

My problem stemmed from the fact that i had used the installer BEFORE trying to
install an up to date version from svn.

First I deleted "/usr/local/lib/python2.5/site-packages/mptt/" to remove the 
older
version of mptt.

Then I used svn to get the latest release of mptt.

Finally I opened a terminal in mptt-trunk and ran "sudo python setup.py 
install" to
install the new version.

Also, if you haven't done so, you might want to run "svn update" in your 
django_trunk
folder.

Good Luck
-Caz

Original comment by skopsyc...@gmail.com on 25 Jan 2009 at 6:30

[GoogleCodeExporter]

> Comment 5  by skopsycats, Jan 25, 2009

Thank you for this.  It is exactly what I needed to hear.

Just a note for anyone reading this who had the same problem: the docs on the 
web
page similarly have to be updated.  In particular, you need to say
order_insertion_by=['title'] (making it a list).  The docs from the svn are 
correct.

Original comment by jim.heff...@gmail.com on 5 Feb 2009 at 7:15

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Thanks, you saved me a lot of time.

Original comment by lenko...@gmail.com on 6 Jun 2009 at 6:37

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Yes - the current SVN release has it fixed.
Thank you.

Original comment by uszywiel...@gmail.com on 30 Aug 2009 at 7:27

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Fixed for me as well

Original comment by abdulrah...@gmail.com on 14 May 2010 at 1:01

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Awesome, thanks!

Original comment by lardissone on 17 Jun 2010 at 5:23

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Confirmed! works with mptt revision 121 and django 1.2.

Original comment by rumi.kg@gmail.com on 18 Jun 2010 at 2:13

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The recently added 0.3 release and the source checkout from github work with 
Django 1.1+

The SVN repo is now out of date, if you are using it please upgrade to 0.3 or 
checkout the github source.

(also the order_insertion_by bug is fixed in HEAD - it now accepts either 
string, tuple, or list)

Original comment by craig.ds@gmail.com on 2 Sep 2010 at 1:01

• Changed state: Fixed