There is no available initial state for the content type while testing

[superandrew]

When I create an integration test, I create objects in the DB for which I have defined a state field.

        p = Procedure.objects.create()

In django admin I defined 4 states, and 3 transitions

So I understood from the documentation that since CREATED is never a destination state, django-river would have guessed that this was the initial state.

But I get this error:

raise RiverException(ErrorCode.NO_AVAILABLE_INITIAL_STATE, 'There is no available initial state for the content type %s. ' % self._content_type)
river.utils.exceptions.RiverException: There is no available initial state for the content type procedure. 

I'm completely lost, as I understand that this is common but I haven't find a solution, also looking at similar issues.

Any idea?

Thanks

[superandrew]

I notice that in my River applications I have just

States and Transition Approval Meta entities to add or modify. No Transitions or Proceeding Meta like in the tutorial. Does that mean that I miss something from the setup?

[superandrew]

this is what I tried, after understanding that many of the tutorials refer to old version of the framework:

        cr = State.objects.create(label="Created", slug='cr')
        sb = State.objects.create(label="Submitted", slug='sb')
        va = State.objects.create(label="Validated", slug='va')
        rf = State.objects.create(label="Refused", slug='rf')
        cr.save()
        sb.save()
        va.save()
        rf.save()

        content_type = ContentType.objects.get_for_model(Procedure)

        transition_am1 = TransitionApprovalMeta.objects.create(source_state=cr, destination_state=sb, content_type=content_type)
        transition_am2 = TransitionApprovalMeta.objects.create(source_state=sb, destination_state=va, content_type=content_type)
        transition_am3 = TransitionApprovalMeta.objects.create(source_state=sb, destination_state=rf, content_type=content_type)
        transition_am1.save()
        transition_am2.save()
        transition_am3.save()

In a non testing scenario I suppose that you should run migrate, or maybe there is something that I am still missing.

My test suite starts with:

140549272366536 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta

then, for every test in which I try to create programmatically a Procedure,

line 38, in initial_state raise RiverException(ErrorCode.NO_AVAILABLE_INITIAL_STATE, 'There is no available initial state for the content type %s. ' % self._content_type) river.utils.exceptions.RiverException: There is no available initial state for the content type procedure.

[superandrew]

ok, I was able to fix it. The problem was that (as a fool) I was doing the setup in the setup method, so every case didn't have data. So Now it works, passing the first state to the object I create

def create_workflow():
cr = State.objects.create(label="Created", slug='cr')
sb = State.objects.create(label="Submitted", slug='sb')
va = State.objects.create(label="Validated", slug='va')
rf = State.objects.create(label="Refused", slug='rf')
cr.save()
sb.save()
va.save()
rf.save()

content_type = ContentType.objects.get_for_model(Procedure)

transition_am1 = TransitionApprovalMeta.objects.create(source_state=cr, destination_state=sb,
                                                       content_type=content_type)
transition_am2 = TransitionApprovalMeta.objects.create(source_state=sb, destination_state=va,
                                                       content_type=content_type)
transition_am3 = TransitionApprovalMeta.objects.create(source_state=sb, destination_state=rf,
                                                       content_type=content_type)
transition_am1.save()
transition_am2.save()
transition_am3.save()

return cr

then,

  p = Procedure.objects.create(current_state=create_workflow())

however, I still have this: 140283630478712 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta when starting tests.

[superandrew]

When in functional test I post an object, even after the create_workflow call, I have the same error. probably I should put an initial state in the perform_create override when I am in test mode but I think this kind of misses the point of the initial state guessing.

ErrorCode.NO_AVAILABLE_INITIAL_STATE

In normal mode I have no errors, apart from the continuous <number>field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta when starting tests. warning.

[javrasya]

Hi @superandrew, it seems like you are not setting field_name of TransitionApprovalMeta in your create workflow function. Since you can have multiple workflows for the same model regarding the different model fields, this is the only way that django-river would figure out what workflow it is. It is weird that django allows you to create a TransitionApprovalMeta without a field name. I would not expect that.

But apart from that, I can say that the warnings and error messages should definitely be improved with the field_name part as well.

[superandrew]

oh, wow. Silly me. It works now.

What do you think about the

140332700806376 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta warning I see everytime I launch django and/or the test suite? Is this a misconfiguration, or is it normal? Also, is it normal that everytime I launch makemigrations I've got a new migration with that id changed?

Thanks!

[javrasya]

There seems to be something wrong with field_name error message though. 140549272366536 in the message is actually the field name. But I don't know why it thinks that this number is the field name :-)

I will take a look at this when I have time. But you try setting your field_name in the TransitionApprovalMeta. It should fix it.

Here is an example of creating it programmatically. It is with factory_boy library but the idea is the same.

https://github.com/javrasya/django-river/blob/master/river/tests/base_test.py

[superandrew]

thanks! however setting the field fixed the error, so all tests now run

[superandrew]

@javrasya I think there still is a problem with the fields because every time I run django I have this message:

140692356329112 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta

and everytime I run manage.py makemigrations django river creates a new migration slightly changing the field name:

from django.db import migrations
import django.db.models.deletion
import river.models.fields.state

class Migration(migrations.Migration):

    dependencies = [
        ('organization', '0002_auto_20190512_1919'),
    ]

    operations = [
        migrations.AlterField(
            model_name='procedure',
            name='current_state',
            field=river.models.fields.state.StateField(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='rnc2a0dc9cd27e4f9383979698d883a495', to='river.State'),
        ),
    ]

Do you think this is related to this issue or do you think a new one should be created?

Thanks

[javrasya]

@superandrew , I think I know why this is happening and it is a bug in the place where this is logged. It is not affecting anything. Just logging part is buggy. Please ignore it until I fix and release it.

https://github.com/javrasya/django-river/blob/master/river/apps.py#L21

worflow_registry.workflow is a map of lists. It should be flattened and then looped.

[javrasya]

I created a PR @superandrew . I am waiting for the build to see if that breaks anything

[javrasya]

I even published it. Can you try django-river v1.0.1 @superandrew .

[superandrew]

thanks @javrasya !

I think the problem has been solved partially, but not completely. django-river==1.0.0

ipdbackend on  release/1.1.2 [$!] via ipaddi-backend took 1m 44s 
➜ manage.py makemigrations        
140252405073224 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta
Migrations for 'organization':
  ipdbackend/organization/migrations/0004_auto_20190701_1310.py
    - Alter field current_state on procedure

ipdbackend on  release/1.1.2 [$!?] via ipaddi-backend took 3s 
➜ manage.py makemigrations
140333496797320 field doesn't seem have any transition approval meta in database. You should create it's TransitionApprovalMeta
Migrations for 'organization':
  ipdbackend/organization/migrations/0005_auto_20190701_1310.py
    - Alter field current_state on procedure

django-river==1.0.1

ipdbackend on  release/1.1.2 [$!?] via ipaddi-backend took 2s 
➜ manage.py makemigrations       
Migrations for 'organization':
  ipdbackend/organization/migrations/0006_auto_20190701_1313.py
    - Alter field current_state on procedure

ipdbackend on  release/1.1.2 [$!?] via ipaddi-backend took 2s 
➜ manage.py makemigrations
Migrations for 'organization':
  ipdbackend/organization/migrations/0007_auto_20190701_1313.py
    - Alter field current_state on procedure

What happens is, despite not being warned, a new migration is generated every time I run manage.py makemigrations.

Is this normal?

Thanks

[javrasya]

It doesn't seem to be normal 😄

Can you share those migration file contents? So I can have some idea maybe 🤔

[javrasya]

I managed to reproduce that. I will have a look if I can understand why this is happening.

[javrasya]

Here I created another issue for that. Let's discuss it over there. Please don't use this issue. If you have another issue feel free to create a new one for it.

https://github.com/javrasya/django-river/issues/77