title: Django 1.7 synchronize unmigrated apps
body: <p>I started my model:</p>
  
  <p>myapp.models.py</p>
  
  <pre><code>class MyModel(models.Model):
  
      field_a = models.FloatField()
      field_c = models.FloatField()
  </code></pre>
  
  <p>Then ran <code>./manage.py migrate</code> on my new project and it was all good:</p>
  
  <pre><code>Operations to perform:
    Synchronize unmigrated apps: myapp
    Apply all migrations: admin, contenttypes, auth, sessions
  Synchronizing apps without migrations:
    Creating tables...
      Creating table myapp_mymodel
    Installing custom SQL...
    Installing indexes...
  Running migrations:
    Applying contenttypes.0001_initial... OK
    Applying auth.0001_initial... OK
    Applying admin.0001_initial... OK
    Applying sessions.0001_initial... OK
  </code></pre>
  
  <p>Then I changed my model:</p>
  
  <pre><code>class MyModel(models.Model):
  
      field_a = models.FloatField()
      field_b = models.FloatField()
      field_c = models.FloatField()
  </code></pre>
  
  <p>I ran <code>./manage.py migrate</code> again and nothing happened.</p>
  
  <pre><code>(project)$ ./manage.py migrate 
  Operations to perform:
    Synchronize unmigrated apps: myapp
    Apply all migrations: admin, contenttypes, auth, sessions
  Synchronizing apps without migrations:
    Creating tables...
    Installing custom SQL...
    Installing indexes...
  Running migrations:
    No migrations to apply.
  </code></pre>
  
  <p>I'm wondering what I need to do to make my new app migrate?</p>