Hi,

Does anybody know how are changes detected by the ```makemigrations``` 
command in django 1.7?
It seems that I have a bug. The original post is on stackoverflow 
<http://stackoverflow.com/questions/26370786/django-1-7-migrations-changes-detected-while-nothing-has-changed>
 
but no one has replied so I am trying here.


I have the issue that it always tells me there are changes for one of my 
field whereas there are not. When I run the command, it just writes the 
same migration file over and over with no changes.

The field is a custom field on which I implemented the deconstruct method 
and have some parameters that are objects so I used the deconstructible 
decorator.

I created a project on github that replicates the issue: 
https://github.com/YAmikep/django-testmigrations

What did I do wrong? Is this a bug?


Here is what I ran:

    /projects/testmigrations$ python manage.py makemigrations app1
    Migrations for 'app1':
      0001_initial.py:
        - Create model ModelA
    /projects/testmigrations$ python manage.py migrate
    Operations to perform:
      Apply all migrations: admin, contenttypes, auth, app1, sessions
    Running migrations:
      Applying contenttypes.0001_initial... OK
      Applying auth.0001_initial... OK
      Applying admin.0001_initial... OK
      Applying app1.0001_initial... OK
      Applying sessions.0001_initial... OK
    /projects/testmigrations$ python manage.py makemigrations
    Migrations for 'app1':
      0002_auto_20141014_2123.py:
        - Alter field field1 on modela
    /projects/testmigrations$ python manage.py makemigrations
    Migrations for 'app1':
      0003_auto_20141014_2123.py:
        - Alter field field1 on modela


The migration files 0002_auto_20141014_2123.py and 
0003_auto_20141014_2123.py contain the exact same operations:

    operations = [
        migrations.AlterField(
            model_name='modela',
            name='field1',
            field=app1.models.CustomField(max_length=50, 
value_manager=app1.models.ValueManager(values=[app1.models.Value(val=1), 
app1.models.Value(val=2)])),
        ),
    ]


Thanks
Mike

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