Just give an amount field to the Ingredient:
class Ingredient(meta.Model):
fields = (
meta.CharField('name', 'Name', maxlength=64),
meta.CharField('description', 'Description', maxlength=128,
blank=True),
meta.FloatField('amount','Amount', max_digits=5,
decimal_places=2),
meta.CharField('unit', 'Unit', maxlength=32,
choices=('kg','lb','ps','l',))
)
Radek
paolo wrote:
> Hi, I'm trying to do a simple cookbook application using Django, but
> there is something unclear creating models. In fact, it's easy to
> associate a category to the recipe via ForeignKey field, and it's easy
> too associate more ingredients to a recipe via ManyToManyField.
> However, each ingredient has an associated number of pieces (2 eggs) or
> a weight (2tb olive oil), which I'm not able to express via the model.
> Can you explain if it is possible and how?
>
> In cookbook/apps/recipes/models I have these three classes (they have
> been stripped of minor details):
>
> class Ingredient(meta.Model):
> fields = (
> meta.CharField('name', 'Name', maxlength=64),
> meta.CharField('description', 'Description', maxlength=128,
> blank=True),
> )
>
> class Category(meta.Model):
> fields = (
> meta.CharField('name', 'Nome', maxlength=128),
> meta.TextField('description', 'Description', blank=True),
> )
>
> class Recipe(meta.Model):
> def get_diff_choices():
> DIFF_CHOICES = (
> ('01', 'Easy'),
> ('02', 'Intermediate'),
> ('03', 'Hard'),
> )
> return DIFF_CHOICES
>
> fields = (
> meta.DateField('creation_date', 'Create', auto_now_add=True),
> meta.CharField('name', 'Name', maxlength=128),
> meta.ForeignKey(Category, name='category_id'),
> meta.ManyToManyField(Ingredient, name='ingredient_id'),
> meta.CharField('difficulty', 'Difficulty', maxlength=64,
> choices=get_diff_choices()),
> meta.TextField('description', 'Description'),
> )
>
> TIA
