Re: Absolute beginner question -- recipes

Hey everybody,

thank you very much for your answers. I think I have already learned a lot from you! Well - there is quite a difference between stepping through a tutorial and trying to do something on my own. Regarding Mikes question whether a step of a recipe should be a sub-recipe. Well, as far as I know hierarchical relationships are hard to model in relational databases; that's why I kept my hands off! My decision to create a recipe app has a simple reason: I read some comparisons between django and ruby on rails and I decided to go for django since it seems to leave more freedom. I found a RoR tutorial on creating a recipe app some time ago and I am trying to do the same thing in django now.

Concerning my model - this is how it looks like:

from __future__ import unicode_literals

from django.db import models

class Unit(models.Model):
    abbreveation = models.CharField(max_length=5, primary_key=True)
    description = models.CharField(max_length=50)

    def __str__(self):
        return "%s (%s)" % (self.description, self.abbreveation)

class Ingredient(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name

class Step(models.Model):
    name = models.CharField(max_length=255, blank=True)
    recipe = models.ForeignKey('Recipe', related_name='steps', on_delete=models.CASCADE, null=True)
    description = models.TextField()
    ingredient = models.ManyToManyField(Ingredient, through='StepIngredient')

    def __str__(self):
        if (self.name == ''):
            return "Step %d" % self.id
        else:
            return "Step %d (%s)" % (self.id, self.name)

# additional information for many to many relationship between schritt and zutat
class StepIngredient(models.Model):
    class Meta:
        unique_together = (('step', 'ingredient'),)
    step = models.ForeignKey(Step, null=True)
    ingredient = models.ForeignKey(Ingredient, null=True)
    amount = models.DecimalField(max_digits=7, decimal_places=3)
    unit = models.ForeignKey(Unit, null=True)

    def __str__(self):
        return "%d %s %s" % (self.amount, self.unit.abbreveation, self.ingredient)

class Recipe(models.Model):
    name = models.CharField(max_length=255)
   
    # file will be uploaded to MEDIA_ROOT/images
    # TODO: Upload works but link fails. Maybe sth. wrong with MEDIA_URL???
    photo = models.ImageField(upload_to='images/', null=True)
    portionen = models.IntegerField(default=2)

    def __str__(self):
        return self.name

Thank you James for pointing me at how to do my queries with django; I can finally list my steps using:

{% for step in recipe.steps.all %}

within my template. However, given the model above I am still not sure how to access a single steps ingredients ... any ideas or suggestions on my current model?

Thanks, Simon

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