Django Q和查找-在复杂查找中查询多个条目

所以我试图在我的项目中实现一个AJAX搜索表单

我的模型包含一个菜谱类和一个配料类，通过外键连接到菜谱，这样每个菜谱都可以有几个配料

我的数据库中有一个名为omelet的食谱条目，它有两种成分——鸡蛋和牛奶

我的问题是这样的：

for title_ing in search_text:
    recipe_list_search = recipe_list_search & (Q(ingredients__ingredient__icontains=title_ing))

当分别搜索每种成分时，我会得到正确的返回值，例如，我的鸡蛋输出：

egg
(AND: ('ingredients__ingredient__icontains', 'egg'))
<QuerySet [<Recipe: Eggs>, <Recipe: omlet>, <Recipe: Pan Egg>]>

以及以下观点：

def search(request):
if request.method == "POST":
    search_text = request.POST['search_text']
else:
    search_text = ''

recipe_list_search = ''
print(search_text)
search_text = search_text.split()

recipe_list_search = Q()
for title_ing in search_text:
    recipe_list_search = recipe_list_search & (Q(ingredients__ingredient__icontains=title_ing))
    print(recipe_list_search)
f_search=Recipe.objects.filter(recipe_list_search).distinct()
print(f_search)
context = {'recipe_list_search': f_search}
return render(request, 'stage9/ajax_search.html', context)

---

可能是一个noob问题，但我非常感谢您的帮助，谢谢。

不要在QuerySet上使用AND运算符，尝试使用itertools进行链接

from itertools import chain


your_queryset = #("whatever_you_queryset_is") ie, Q(ingredients__ingredient__icontains=title_ing) 

for title_ing in search_text:
    recipe_list_search = list(chain(recipe_list_search, your_queryset))

---

这可能会使您的代码有一些意义。

我没有删除，只是编辑了标题。什么是输出？在你说出你需要什么之前，很难纠正代码对不起，我的不好，但是你的编辑并没有改善这个问题。我正在寻找煎蛋卷条目，这样输出将是蛋奶（和：（“配料”、“配料”、“鸡蛋”）（和：（“配料”、“配料”、“鸡蛋”），（“配料”、“鸡蛋”），（“配料”、“牛奶”）好的，所以chain将提供与使用or运算符“|”相同的效果，这意味着输入的“蛋奶”将返回所有以“奶”或“蛋”为成分的配方。我想要和，所以它将只返回那些同时具有这两个属性的食谱。

class Ingredient(models.Model):
recipe = models.ForeignKey("Recipe", verbose_name=_("Recipe"), related_name="ingredients", on_delete=models.CASCADE)
quantity = models.CharField(_("Quantity"), max_length=10, blank=True, null=True)
unit = models.CharField(_("Unit"), choices=fields.UNITS, blank=True, null=True, max_length=20)
ingredient = models.CharField(_("Ingredient"), max_length=100)
note = models.CharField(_("Note"), max_length=200, blank=True, null=True)

def __str__(self):
    _ingredient = '%s' % self.ingredient

    if self.unit:
        _ingredient = '%s %s' % (self.get_unit_display(), _ingredient)

    if self.quantity:
        _ingredient = '%s %s' % (self.quantity, _ingredient)
    #python anywhere doesnt register len for somereason so should be changed
    if len(self.note):
       _ingredient = '%s - %s' % (_ingredient, self.note)

    return _ingredient

class Meta:
    verbose_name = _("Ingredient")
    verbose_name_plural = _("Ingredients")

def search(request):
if request.method == "POST":
    search_text = request.POST['search_text']
else:
    search_text = ''

recipe_list_search = ''
print(search_text)
search_text = search_text.split()

recipe_list_search = Q()
for title_ing in search_text:
    recipe_list_search = recipe_list_search & (Q(ingredients__ingredient__icontains=title_ing))
    print(recipe_list_search)
f_search=Recipe.objects.filter(recipe_list_search).distinct()
print(f_search)
context = {'recipe_list_search': f_search}
return render(request, 'stage9/ajax_search.html', context)

from itertools import chain


your_queryset = #("whatever_you_queryset_is") ie, Q(ingredients__ingredient__icontains=title_ing) 

for title_ing in search_text:
    recipe_list_search = list(chain(recipe_list_search, your_queryset))