How retrieve all comments of all posts

I have a Blog model, a Post model and a Comment model:

class Blog(models.Model):

    title = models.CharField(_('name'), max_length=80)        
    creator = models.ForeignKey(User, related_开发者_如何学运维name="created_pages")
    created = models.DateTimeField(_('created'), default=datetime.now)
    description = models.TextField(_('description'), null=True, blank=True)

class Post(models.Model):

    title = models.CharField(_('title'), max_length=60, blank=True, null=True)
    body = models.TextField(_('body'))
    blog = models.ForeignKey(Blog, related_name="posts")
    user = models.ForeignKey(User)     
    comments = generic.GenericRelation(Comment)


class Comment(models.Model):

    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField(_('object ID'))
    content_object = generic.GenericForeignKey()
    user = models.ForeignKey(User)  
    body = models.TextField(_('body'))

In a view I retrieve all post with this istruction:

    posts = blog.posts.all()

So my question is:

How can I retrieve all comments of all posts in the template ?

I have tryed this but the comments aren't displayed:

{% for post in posts %}

  {{ post.title }} 
  {{ post.body }} 

      {% for comment in post.comments.all %}

         {{ comment.body }} 

      {% endfor %} 

{% endfor %}

You've just missed off the all.

{% for comment in post.comments.all %}

try with this

{% for comment in post.comments_set.all %}