On 29/02/2016 2:09 PM, James Schneider wrote:
Again, I'm making some assumptions about your models. If the above code
snippets don't work (aside from typos), please post up your models.py
file(s) so that we can adjust accordingly.
I think James is right. Maybe the answer to the above question is in
your subject line.
If I was doing a recipe app I would need to scratch my head. For
example, do I permit an ingredient to also be a recipe? In other words,
are ingredients simply raw materials or can they be separate
concoctions. I'm no chef but I suspect recipes include separately
prepared components which are brought together during the cooking
process or at the latest just before serving.
Maybe your "step" is a sub-recipe.
So the real question is about your expertise. If you are a chef all you
need here is how to do many-to-many relationships. There must be heaps
of manufacturer apps out there. They generally go under the label of
"bill-of-materials". It seems to me quite similar to recipes.
Anyway ...
I'm building a much simpler ingredients system with substances and
mixtures where a mixture is a substance having relationships with other
substances. Here is my setup:
class Substance(models.Model):
ingredients = models.ManyToManyField('self', symmetrical=False,
blank=True, through='Substance_Ingredients')
...
class Substance_Ingredients(models.Model):
substance = models.ForeignKey('Substance', null=True, blank=True,
related_name='base_substance')
ingredient = models.ForeignKey('Substance', null=True, blank=True,)
proportion = models.DecimalField(null=True, blank=True)
...
Hope this helps
Mike
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