Many-to-many Relationship Between Django Apps Fails

What's been done so far:

• I was on Django 1.5 and upgraded to 1.6 (cannot go higher as we are on Python 2.6) and this did not solve the problem.
• I have researched this issue to death and cannot seem to find a definite answer. Looking through the Django Project Bug Tracker, I have seen similar issues but none seem to fit my particular case
• I have resolved the problem in the past using a raw SQL call to replace for example affpart.damage_types.all() with a custom function but this is starting to happen more frequently now and is becoming a real pain.

Description:

I have two Django apps under one project. One of the apps makes use of models in another app using a many-to-many relationship.

This has been working smoothly for months, and in fact it works fine on my production machine but fails on my development machine. The scenario lately has been that I am asked to add a new feature and when I start to work on it I get a FieldError in related code which I haven't even touched.

The offending line of code for this latest issue is: for dt in affpart.damage_types.all()

The error is:

Cannot resolve keyword u'affectedpart' into field. Choices are: cgs_damage_code, description, id, reg_exp, sti

The error occurs in the bowels of Django in the query.py module.

From a high-level, this error occurs when I am trying to use a Many-to-many between models in different Django apps. For example, an affected part can have more than one type of damage and a damage type can be found on different affected parts.

The two apps are: trending and sitar

sitar was built first and has the models that I want to use from trending.

In trending, my models.py file has an AffectedPart model something like this:

from sitar.models import (Part, DamageType, Aircraft)    class AffectedPart(models.Model):    .  .  .        occurrence_date = models.DateField()      partnumber = models.ForeignKey(Part)      damage_types = models.ManyToManyField(DamageType, null=True, blank=True)      repair_types = models.ManyToManyField(RepairType, null=True, blank=True)

.If anyone has a solution to this or knows of best practices for models in one application having many-to-many relationships with models in another application I would love to hear it.

Thanks

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