我可以在__unicode__中使用ForeignKey吗？

I have the following classes: Ingredients, Recipe and RecipeContent...

我有以下课程：成分，食谱和食谱内容......

class Ingredient(models.Model):
    name = models.CharField(max_length=30, primary_key=True)
    qty_on_stock = models.IntegerField()

    def __unicode__(self):
        return self.name

class Recipe(models.Model):
    name = models.CharField(max_length=30, primary_key=True)
    comments = models.TextField(blank=True)
    ingredient = models.ManyToManyField(Ingredient)

    def __unicode__(self):
        return self.name

class RecipeContent(models.Model):
    recipe = models.ForeignKey(Recipe)
    ingredients = models.ForeignKey(Ingredient)
    qty_used = models.IntegerField()

but for __unicode__() in RecipeContent I would like to use the Recipe name to which this RecipeContent belongs to... is there a way to do it?

但是对于RecipeContent中的__unicode __（），我想使用这个RecipeContent所属的Recipe名称......有没有办法做到这一点？

4 个解决方案

#1

class RecipeContent(models.Model):
  ...
  def __unicode__(self):
    # You can access ForeignKey properties through the field name!
    return self.recipe.name

#2

If you only care about the name part of the Recipe, you can do:

如果您只关心食谱的名称部分，您可以：

class Recipe(models.Model):
    name = models.CharField(max_length=30, primary_key=True)
    comments = models.TextField(blank=True)
    ...

    def __unicode__(self):
        return self.name

class RecipeContent(models.Model):
    recipe = models.ForeignKey(Recipe)
    ...

    def __unicode__(self):
        return str(self.recipe)

#3

Yes, you can (as bishanty points), but be prepared for situation when __unicode__() is called but FK is not set yet. I came into this few times.

是的，你可以（作为bishanty点），但是在调用__unicode __（）但是尚未设置FK的情况下做好准备。我进入这几次。

#4

In Python 3 there is no __unicode__, you need to use __str__ instead.

在Python 3中没有__unicode__，你需要使用__str__。

    class RecipeContent(models.Model):
        ...
        def __str__(self):
            return self.recipe.name

#1

class RecipeContent(models.Model):
  ...
  def __unicode__(self):
    # You can access ForeignKey properties through the field name!
    return self.recipe.name

#2