如何解决如何在Django中为模型分配实例?
我正在构建一个儿童杂项管理应用程序,但遇到了一个障碍。这是我想要做的:
- 为各个孩子分配各种规则的个体实例(即具有多个“洗碗”实例,这样一个孩子就可以完成其版本,而不必将每个孩子的版本都标记为完成),这样我就可以:
- 仅在自己的页面上显示分配给每个孩子的规则(即,孩子1可以显示其规则实例a,b,c,而孩子2可以显示其规则实例b,c,d)
- 最终目标是能够计算出每个孩子获得的积分
这是我到目前为止所做的:
- 显示所有孩子的名单
- 创建规则实例的能力
- 显示每个孩子的所有规则实例。
这是我的模特:
class Rule(models.Model):
"""
Model representing a base class for rules. Weight field is how much you want the rule to be worth. The same rule can be applied to multiple kids,and a single kid can be assigned multiple rules.
"""
name = models.CharField(max_length=50,help_text='Enter rule',default=None)
weight = models.IntegerField(default=0)
description = models.TextField(max_length=250,help_text='Enter description of rule')
completed = models.BooleanField(default=False,help_text='Is this rule completed?')
def get_absolute_url(self):
"""
url to gain access to one Rule
"""
return reverse('rule-detail',args=[str(self.id)])
class RuleInstance(models.Model):
"""
Model representing instances of rules. Instances should be assigned to kids.
"""
id = models.UUIDField(primary_key=True,default=uuid.uuid4,help_text='Unique ID for this rule')
rule = models.ForeignKey(Rule,on_delete=models.SET_NULL,null=True)
class Kid(models.Model):
name = models.CharField(max_length=20,help_text='Enter kid name',default=None)
rules = models.ManyToManyField(RuleInstance,help_text='Select a rule to give to this kid')
# https://docs.djangoproject.com/en/3.0/topics/db/examples/many_to_many/
points = models.IntegerField(default=0)
class Meta:
ordering = ['name']
# methods
def __str__(self):
return f'Name: {self.name}\n Points total: {self.points} \n Rules assigned: {self.rules}'
def get_absolute_url(self):
"""
url to gain access to one Kid
"""
return reverse('kid-detail',args=[str(self.id)])
以下是相关视图:
def index(request):
"""
view function for site homepage. Stuff below will be subject to change if I don't like how it looks
"""
kids_list = Kid.objects.all()
rules_list = Rule.objects.all()
rule_instance_list = RuleInstance.objects.all()
context = {
'kids_list' : kids_list,'rules_list' : rules_list,'rule_instance_list': rule_instance_list,}
return render(request,'index.html',context=context)
class KidDetailView(generic.DetailView):
model = Kid
def get_context_data(self,**kwargs):
context = super().get_context_data(**kwargs)
context['rule_instance_list'] = RuleInstance.objects.all()
return context
我应该如何调整模型或视图以完成我要完成的工作? Kid和RuleInstance模型之间的多对多关系是否是解决此问题的正确方法?
解决方法
- 由于每个RuleInstance仅分配给一个孩子,因此最好建立一对多的关系。
- 由于规则的每个实例应分别标记为“已完成”,因此
android:textSize="300sp" //Its a fixed value
字段应位于实例上,而不是规则上。
像这样:
completed
这将为称为class RuleInstance(models.Model):
"""
Model representing instances of rules. Instances should be assigned to kids.
"""
id = models.UUIDField(primary_key=True,default=uuid.uuid4,help_text='Unique ID for this rule')
rule = models.ForeignKey(Rule,on_delete=models.SET_NULL,null=True)
kid = models.ForeignKey(Kid,related_name='rules')
completed = models.BooleanField(default=False,help_text='Is this rule completed?')
的{{1}}模型添加一个隐式字段。
当您需要创建新的规则实例时,您将执行以下操作:
Kid
(如果杂事很规律,您可能还需要在RuleInstance上添加一个“日期”字段。)
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