id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27038	Migration being created even when no change was made.	Ricardo Serrano	nobody	"I'm having a problem with migrations. They are being created by makemigrations even after no change has been made. I'm in my 57th migration so I can't create a simple way to reproduce the problem. 

My model is this:

{{{#!python
class Layer3d(Process):
    last_modified = models.DateTimeField(auto_now=True)
    info          = models.TextField(verbose_name=_('layer info'), default='{}')

class Layer3dProjection(models.Model, Layer3dProjectionMixin):
    name     = models.CharField(verbose_name=_('name'), max_length=40, default='', validators=[name_regex], unique=True)
    llist    = models.ForeignKey(LayerList, verbose_name=_('layer list'))
    layer3d  = models.ForeignKey(Layer3d)
    distance = models.FloatField(default=-1)
    last_modified = models.DateTimeField(auto_now=True)
    
    class Meta:
        unique_together = (('llist', 'name'),)
        ordering = ['name']
}}}

This migration is being created, time after time, without modifying any model.

{{{#!python
# -*- coding: utf-8 -*-
# Generated by Django 1.9.7 on 2016-08-09 00:50
from __future__ import unicode_literals

from django.db import migrations, models
import django.db.models.deletion

The migration being created is this.

class Migration(migrations.Migration):

    dependencies = [
        ('studies', '0057_auto_20160809_0047'),
    ]

    operations = [
        migrations.AlterField(
            model_name='layer3dprojection',
            name='layer3d',
            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='studies.Layer3d'),
        ),
    ]
}}}

"	Bug	closed	Migrations	1.9	Normal	needsinfo	makemigrations		Unreviewed	0	0	0	0	0	0