How to approach this problem?

I'm trying to solve a problem, but I have no idea how to face it. I need some help :-)

I have a model hierarchy like this:

    class Task(models.Model):

        name = models.CharField(max_length=255)

        number_of_steps = models.IntegerField()

    class StepGroup(models.Model):

        task = models.ForeignKey(Task)

        init_date = models.DateField()

    class Step(models.Model):

        group = models.ForeignKey(StepGroup)

        name = models.CharField(max_length=255)

I must write a dialog where I create a number of Step Groups. An InlineFormSet looks the way to go, but as there are two levels of nesting, I don't know how to do that.

Besides, I need the usual stuff with forms: error control (form.name_of_field.errors), autopopulation when editing the Task, etc, so doing it manually with javascript and server-side handling of the POST request would be too complicated and error-prone.

This is the way I need the form (the number of steps in each group is set by the "number_of_steps" field in the Task model):

+-----------------------------------+

| STEP GROUP 1                      |

|                                   |

| Init date: _____________          |

|                                   |

| Step 1: ________________          |

| Step 2: ________________          |

| Step 3: ________________          |

|                                   |

+-----------------------------------+

| STEP GROUP 2                      |

|                                   |

| Init date: _____________          |

|                                   |

| Step 1: ________________          |

| Step 2: ________________          |

| Step 3: ________________          |

|                                   |

+-----------------------------------+

|                                   |

|             +-------------------+ |

|             | Create step group | |

|             +-------------------+ |

+-----------------------------------+

Please, any kind of help, suggestion or link will be very appreciated :-)

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