Django 中的原始 sql 查询问题

Question

我正在尝试进行 SQL 查询以实现给出的答案。

用户建议我尝试做一个原始的 sql 查询来解决。我在实施他的建议时遇到问题。

例如，这是我目前所拥有的。

ingredients = ["eggs", "bacon", "salt"]
recipes = Recipe.objects.raw('select whattocook_RecipeIngredients \
    from whattocook_Recipe a \
    inner join whattocook_RecipeIngredients b \
    on a.id = b.recipe_id and b.ingredient in (ingedients) \
    group by recipeingredients \
    having count(*) >= 2')

但这不起作用。他的回答说要这样做

recipe_list = Recipe.objects.raw('select a.*
   from app_Recipe a 
   inner join app_RecipeIngredients b
      on a.id = b.recipe_id and b.ingredient in ("egg", "bacon", "rice")
   group by a.*
   having count(*) >= 2')

maybe replace app_ with your project name, replace a.* with list of column names.

所以我想我误解了我需要替换哪些列，因为我的代码给了我这个错误。

django.db.utils.ProgrammingError: column "ingedients" does not exist
LINE 1: ...       on a.id = b.recipe_id and b.ingredient in (ingedients...
                                                             ^
HINT:  Perhaps you meant to reference the column "b.ingredient".

我的app叫whattocook，型号如下

class RecipeIngredients(models.Model):
    recipe = models.ForeignKey(Recipe, on_delete=models.CASCADE, null=True)
    ingredient = models.TextField(null=True, blank=True)
    quantity = models.CharField(max_length=10, null=True, blank=True)
    type = models.CharField(max_length=50, null=True, blank=True)
class Recipe(models.Model):
    account = models.ForeignKey(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.TextField(null=True, blank=True)
    slug = models.SlugField(null=False, blank=True, unique=True)
    image_path = models.ImageField(upload_to=MEDIA_URL, null=True, blank=True)
    description = models.TextField(null=True, blank=True)
    preptime = models.IntegerField(null=True, blank=True)
    cookingtime = models.IntegerField(null=True, blank=True)
    cookingtimeoptions = models.CharField(max_length=100, null=True, blank=True)
    preptimeoptions = models.CharField(max_length=100, null=True, blank=True)
    servings = models.CharField(max_length=100, null=True, blank=True)
    rating_value = models.IntegerField(null=True, blank=True)
    rating_count = models.IntegerField(null=True, blank=True)
    categories = models.ManyToManyField('Category', blank=True)
    date_added = models.DateField(auto_now_add=True)

如有任何帮助，我们将不胜感激

Answer 1

您可以查询：

from django.db.models import <strong>Count</strong>
ingredients = ["eggs", "bacon", "rice"]
Recipe.objects.filter(
    recipeingredients__ingredient__in=ingredients
).alias(
    <strong>ningredient=Count('recipeingredients')</strong>
).filter(
    ningredient__gte=len(ingredients)
)

Django 中的原始 sql 查询问题

Raw sql query issue in Django

django

django-models

django-orm