Question

如何使用django的queryset从MyUser表中获取用户列表，其中UserBankTransaction表中的transaction_paid为False？

class UserBankTransaction(models.Model):
    user = models.ForeignKey(MyUser)
    plaid_transaction_id = models.CharField(max_length=300, unique=True)
    charge_amount = models.DecimalField(max_digits=10, decimal_places=2)
    account_id = models.CharField(max_length=300)
    location_name = models.CharField(blank=True, max_length=300)
    roundup_amount = models.DecimalField(max_digits=10, decimal_places=2, null=True)
    transaction_date = models.DateField()
    transaction_paid = models.BooleanField(default=False)
    created_date = models.DateTimeField(auto_now=False, auto_now_add=True)


class MyUser(AbstractBaseUser):
    username = models.CharField(max_length=255,unique=True,)
    email = models.EmailField(verbose_name='email address',max_length=255,unique=True)
    first_name = models.CharField(max_length=120,null=True,blank=True,)
    last_name = models.CharField(max_length=120,null=True, blank=True,)
    created = models.DateTimeField(auto_now_add=True, null=True, blank=True)
    updated = models.DateTimeField(auto_now=True, null=True, blank=True)

Answer 1

使用向后关系查询将做到：

MyUser.objects.filter(userbanktransaction_set__transaction_paid=False)

Answer 2

如果您要检索用户ID列表：

let search_id = 2;             // id to filter out

let list = Array.of(
 {name: 'apple',  id: 1},
 {name: 'bread',  id: 2},
 {name: 'orange', id: 3},
 {name: 'bagel',  id: 4}
)
log({list});


let filtered = list.filter(e => e.id !== search_id)
log({filtered});


if (filtered.length)
  log(`Found ${filtered.length} matches!`);
else
  log(`The id of ${search_id} has not been found`);




// Simple logger so label is on its own line
function log(){
  let [param1,...args]=arguments;
  
  switch (typeof param1){
    case 'string': 
      if (args.length)
        console.log(`${param1}:`),  // comma intentional
        console.log(args.pop())
      else
        console.log(param1);
      break;
    case 'object':
      for (let key in param1)
        console.log(`${key}:`),   // comma intentional
        console.log(param1[key])
      break;
    default:
      console.log('Error in passed arguments.  Type not recognized.')
  }      
}

如果要检索用户对象列表：

UserBankTransaction.objects \
    .filter(transaction_paid=False)\
    .values_list('user', flat=True)

或者您可以在MyUser.objects.filter(userbanktransaction_set__transaction_paid=False)中指定related_name：

UserBankTransaction.user

然后您可以简单地执行以下操作：

class UserBankTransaction(models.Model):
    user = models.ForeignKey(MyUser, related_name='bank_transactions')

获取相关对象列表-Django Queryset

2 个答案: