Django 1.8 data migrations not able to locate related collections

[A Lee]

Hello,

After upgrading to 1.8 from 1.7.7 our tests are now unable to create test data via data migrations and complain about related collections not existing as attributes for some but not all models (exception stack trace at https://travis-ci.org/virtualcommons/vcweb). It appears to succeed at creating a model object for the first related collection but then dies when attempting to create objects in the second related collection (https://github.com/virtualcommons/vcweb/blob/develop/vcweb/experiment/forestry/migrations/0001_initial_forestry.py#L62). 

Any ideas on what might be causing this? Access to related collections through the django shell and via the web interface still seem to be working fine on 1.8, it's just the data migrations that are failing.

[Pavel Kuchin]

Hi A Lee,

Can't say for sure but probably it is because your related_name is not unique in core/migrations/0001_initial.py (https://github.com/virtualcommons/vcweb/blob/develop/vcweb/core/migrations/0001_initial.py#L647, https://github.com/virtualcommons/vcweb/blob/develop/vcweb/core/migrations/0001_initial.py#L208) 

And based on django documentation the related_name must always be unique (https://docs.djangoproject.com/en/1.8/topics/db/models/#be-careful-with-related-name)

It is just an assumption.

Yours sincerely,

Pavel

[Pavel Kuchin]

related models.py lines

https://github.com/virtualcommons/vcweb/blob/10f44c3038f70a2e91f3a80704a4ab30c748f3e9/vcweb/core/models.py#L2060

https://github.com/virtualcommons/vcweb/blob/10f44c3038f70a2e91f3a80704a4ab30c748f3e9/vcweb/core/models.py#L2087

[Markus Holtermann]

Hi A Lee,

I think I've seen that one before. Can you check if the fix for https://code.djangoproject.com/ticket/24573 resolves the issue?

/Markus

[A Lee]

Hi Markus, thanks for the fast response! Yup, that did the trick. I had to do some manual copypasta into the stable/1.8.x branch to get it to run but it appears that was the issue.

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