title: How can I get all RelatedManagers from a particular Django Model instance?
body: <p>Let's say I have a set of Django Models:</p>
  
  <pre><code>class Article(models.Model):
      title = models.CharField(max_length=100, default='')
      content = models.TextField(default='', blank=False)
      created_at = models.DateTimeField(auto_now=True)
      creator = models.ForeignKey(User, null=True, blank=True)
      score = models.ForeignKey('Score', blank=True, null=True)
      points = models.ManyToManyField('Points')
  
  
  class Score(models.Model):
      value = models.IntegerField()
      created_at = models.DateTimeField(auto_now_add=True)
      creator = models.ForeignKey(User, null=True, blank=True)
  
  
  class Points(models.Model):
      value = models.DecimalField(max_digits=3, decimal_places=1)
      caption = models.CharField(max_length=20, default='')
      created_at = models.DateTimeField(auto_now_add=True)
      creator = models.ForeignKey(User, blank=True, null=True)
  </code></pre>
  
  <p>And now I somehow get an instance of a <code>Score</code> model (without actually knowing that this is <code>Score</code> model) and an instance of <code>Points</code> model (again, without knowing that this is <code>Points</code> model):</p>
  
  <pre><code>&gt;&gt;&gt; type(s)
  &lt;class 'myapp.models.Score'&gt;
  &gt;&gt;&gt; type(p)
  &lt;class 'myapp.models.Points'&gt;
  </code></pre>
  
  <p>Now I can get access to a set of related <code>Article</code> instances via the following code:</p>
  
  <pre><code>&gt;&gt;&gt; s.article_set
  &lt;django.db.models.fields.related.RelatedManager object at 0x10d1e8610&gt;
  &gt;&gt;&gt; p.article_set
  &lt;django.db.models.fields.related.ManyRelatedManager object at 0x10d1e8850&gt;
  </code></pre>
  
  <p>But this is the case where I know actual DB schema and I know that attributes are called <code>article_set</code>. In my case I <strong>do not know</strong> the actual DB scema. And I want to get all the RelatedManager attributes of the current model instance.</p>
  
  <p>I think that it is possible to implement this via <code>._meta</code> attribute but I didn't manage to do that while trying. So I would probably need an actual working example of something like <code>get_related_managers(self)</code> method implementation.</p>