如何通过 table 在 factory boy 中设置动态多对多？

Question

我在使用直通关系与 factory boy 中的一组 django 模型建立多对多关系时遇到问题。我有一堆食谱和配料。通过设置数量的模型，食谱和成分之间存在多对多关系。我有每个型号的工厂，但无法让它们达到 link。

简化models.py:

class Ingredient(models.Model):
    name = models.CharField(max_length=40)

class Recipe(models.Model):
    name = models.CharField(max_length=128)
    ingredients = models.ManyToManyField(Ingredient, through='RecipeIngredient')

class RecipeIngredient(models.Model):
    recipe = models.ForeignKey(Recipe)
    ingredient = models.ForeignKey(Ingredient)
    quantity = models.IntegerField(default=1)

简化factories.py

class RecipeFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Recipe

class IngredientFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = Ingredient

class RecipeIngredientFactory(factory.django.DjangoModelFactory):
    class Meta:
        model = RecipeIngredient
    recipe = factory.SubFactory(RecipeFactory)
    ingredient = factory.SubFactory(IngredientFactory)
    quantity = 1

我试过搞乱 factory.RelatedFactory，但没有成功。理想情况下，我只想能够执行以下操作：

recipe = RecipeFactory(name="recipe1")
ingredient = IngredientFactory(name="ingredient1")
ri = RecipeIngredientFactory(recipe=recipe, ingredient=ingredient)

虽然这样做并没有在任何一方设置多对多关系，而且似乎也无法创建 recipeingredient 模型本身。有谁知道这样做的方法吗？

编辑：

我也试过：

class RecipeWith3Ingredients(RecipeFactory):
    ingredient1 = factory.RelatedFactory(RecipeIngredientFactory, 'recipe')
    ingredient2 = factory.RelatedFactory(RecipeIngredientFactory, 'recipe')
    ingredient3 = factory.RelatedFactory(RecipeIngredientFactory, 'recipe')

但是我无法理解如何使用预先存在的配方和一组成分来创建这些对象。

Answer 1

我刚刚重新创建了这个设置，但我正在努力查看问题所在。这里有几个测试表明一切似乎都运行良好？还是我误解了问题？

# create recipe ingredient and recipe ingredient
recipe = RecipeFactory(name="recipe1")
ingredient = IngredientFactory(name="ingredient1")
recipe_ingredient = RecipeIngredientFactory(recipe=recipe, ingredient=ingredient)

# recipe created?       
r = Recipe.objects.all().first()
self.assertEqual(r, recipe)

# ingredient created?
i = Ingredient.objects.all().first()
self.assertEqual(i, ingredient)

# recipe ingredient created?
ri = RecipeIngredient.objects.all().first()
self.assertEqual(ri, recipe_ingredient)        

# test many to many
self.assertEqual(ri, r.recipeingredient_set.all()[0])
self.assertEqual(ri, i.recipeingredient_set.all()[0])

# add a new ingredient to recipe 1
ingredient2 = IngredientFactory(name='ingredient2')
recipe_ingredient2 = RecipeIngredientFactory(recipe=recipe, ingredient=ingredient2)

# test many to many
self.assertTrue(recipe_ingredient in r.recipeingredient_set.all())
self.assertTrue(recipe_ingredient2 in r.recipeingredient_set.all())

# create a pre-existing recipe and a set of ingredients
pizza_recipe = RecipeFactory(name='Pizza')
cheese_on_toast_recipe = RecipeFactory(name='Cheese on toast')

cheese_ingredient = IngredientFactory(name='Cheese')
tomato_ingredient = IngredientFactory(name='Tomato')
pizza_base_ingredient = IngredientFactory(name='Pizza base')
toast_ingredient = IngredientFactory(name='Toast')

# now put together
RecipeIngredientFactory(recipe=pizza_recipe, ingredient=cheese_ingredient)
RecipeIngredientFactory(recipe=pizza_recipe, ingredient=tomato_ingredient)
RecipeIngredientFactory(recipe=pizza_recipe, ingredient=pizza_base_ingredient)

RecipeIngredientFactory(recipe=cheese_on_toast_recipe, ingredient=cheese_ingredient)        
RecipeIngredientFactory(recipe=cheese_on_toast_recipe, ingredient=toast_ingredient)        

# test pizza recipe
pizza_ingredients = [cheese_ingredient, tomato_ingredient, pizza_base_ingredient]
pr = Recipe.objects.get(name='Pizza')

for recipe_ingredient in pr.recipeingredient_set.all():
    self.assertTrue(recipe_ingredient.ingredient in pizza_ingredients)

# test cheese on toast recipe
cheese_on_toast_ingredients = [cheese_ingredient, toast_ingredient]
cotr = Recipe.objects.get(name='Cheese on toast')

for recipe_ingredient in cotr.recipeingredient_set.all():
    self.assertTrue(recipe_ingredient.ingredient in cheese_on_toast_ingredients)

# test from ingredients side
cheese_recipes = [pizza_recipe, cheese_on_toast_recipe]
ci = Ingredient.objects.get(name='Cheese')

for recipe_ingredient in ci.recipeingredient_set.all():
    self.assertTrue(recipe_ingredient.recipe in cheese_recipes)

如何通过 table 在 factory boy 中设置动态多对多？

How to set dynamic many to many in factory boy with through table?

django

many-to-many

factory-boy