I am making a build database where each product which can be built has
come components which are required to build it. These components in
turn have versions which are required for a particular build. The
relevant parts of the models are reproduced below.
class Component(models.Model):
name=models.CharField(maxlength=60)
class ComponentVersion(models.Model):
component=models.ForeignKey(Component)
version=models.PositiveIntegerField()
class Product(models.Model):
required_components=models.ManyToManyField(Component)
class Build(models.Model):
product=models.ForeignKey(Product)
components=models.ManyToManyField(ComponentVersion)
I have found 2 problems with this:
1. Is there any way of enforcing the ManyToManyField on Build to only
allow ComponentVersions which have a Component in the ManyToManyField
on the associated Product?
2. How would I construct a newform to handle creating/editing Builds
where drop downs for Each component are generated dynamically? I have
looked at http://tinyurl.com/yw583d and it comes come way towards a
solution but I can't figure out how to make the queryset which you
iterate over definable at runtime.
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