[英]how to store a list into many-to-many field in django model
I have a model class dietplan in which there is a many-to-many field named breakfast.我有一个 model class 饮食计划,其中有一个名为早餐的多对多字段。 In my view.py I have done some calculation and get a value for breakfast as nested list ie [['abc','asda'],['val3','val4']]
在我的 view.py 中,我进行了一些计算并得到了早餐的值作为嵌套列表,即 [['abc','asda'],['val3','val4']]
I want to these all 4 list in my many to many field.我想在我的多对多领域列出所有 4 个列表。
This is my code:这是我的代码:
MODELS.PY\模型.PY\
class Dietplan(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
dietplan_name = models.CharField(max_length=255, null=True)
breakfast = models.ManyToManyField('Meal',
related_name='breakfast_meal_name',)
snacks1 = models.ManyToManyField('Meal',
related_name='snacks1_meal_name',)
lunch = models.ManyToManyField('Meal', related_name='lunch_meal_name',)
snacks2 = models.ManyToManyField('Meal',
related_name='snacks2_meal_name',)
dinner = models.ManyToManyField('Meal', related_name='dinner_meal_name',)
calories_slab = models.IntegerField(blank=True, null=True)
VIEWS.PY意见.PY
def dietplan(request):
d = Dietplan.objects.get(id = request.user.id)
d.dietplan_name = 'abc'
d.breakfast.set(','.join(breakfast))
d.save()
Showing unhashable list type error显示不可散列列表类型错误
Assuming Meal objects already exists, first you should get them from their name.假设 Meal 对象已经存在,首先您应该从它们的名称中获取它们。 You can try something like:
您可以尝试以下方法:
meal_names = 'meal1 meal2 meal3'.split()
meal_objects = []
for name in meal_names:
meal_objects.append(Meal.objects.get(name=name))
once you have collected them, you can append them in your manytomany relation as follow:一旦你收集了它们,你可以在你的多对多关系中 append 它们如下:
d = Dietplan.objects.get(id = request.user.id)
d.breakfast.add(*meal_objects) # unpacking meal_objects list as positional arguments
d.save()
Note: I have not tested the code in django, let me know this raise some errors.注意:我没有测试 django 中的代码,让我知道这会引发一些错误。
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