Question

更新

我将查询更改为：

ClinicDoctorDayShift.objects.filter(clinic_doctor__doctor_id = doctor_id)

有了这个，我就能得到所有的价值。但正如您所看到的，我现在没有使用prefectch。如果我必须通过名字获得像filter这样的许多医生，这是否效率低下？

模板现在有这个：

{% for vis in visitinghours %}
                        <tr>
                            <td>
                                {{ vis.clinic_doctor.doctor.full_name }}
                            </td>
                            <td>
                                {{ vis.clinic_doctor.clinic.name }}
                            </td>
                            <td>
                                {{ vis.day_shift.day.day }}

                            </td>
                            <td>
                                {{ vis.day_shift.time }}
                            </td>
                        </tr>
                        {% endfor %}

ORIGINAL

第一个网站。第一次使用Django。我现在正在使用此查询：

visitingQuerySet = ClinicDoctor.objects.filter(doctor_id = doctor_id).prefetch_related('clinicDoctor_dayShift').all()

然后在模板中我想要这样的东西：

{% for vis in visitinghours %}
                        <tr>
                            <td>
                            {{ vis.doctor.full_name }}
                            </td>
                            <td>
                            {{ vis.clinic.name }}
                            </td>
                            <td>
                            {{ vis.clinicdoctordayshift.id }}
                            </td>
                        </tr>


I can get first two `<td>` but not others if I try to get values from other models.

我的模特是：

class User(AbstractUser):
   full_name = models.CharField(max_length=200)
   clinics = models.ManyToManyField(Clinic, through='ClinicDoctor', related_name='doctors')

class ClinicDoctor(models.Model):
   doctor = models.ForeignKey('User', related_name='doctorsF') 
   clinic = models.ForeignKey(Clinic, related_name='clinicsF')

class Day(models.Model):
   day = models.CharField(max_length=20)


class Shift(models.Model):
   shift = models.CharField(max_length=20)
   days = models.ManyToManyField(Day, through='DayShift', related_name='day_shift')


class DayShift(models.Model):
   time = models.TimeField()
   day = models.ForeignKey(Day, related_name='to_day')
   shift = models.ForeignKey(Shift, related_name='to_shift')
   clinics_doctors = models.ManyToManyField(ClinicDoctor, through='ClinicDoctorDayShift', related_name='clinicDoctor_dayShift')

class ClinicDoctorDayShift(models.Model):
   clinic_doctor = models.ForeignKey(ClinicDoctor, related_name='to_clinicDoctor')
   day_shift = models.ForeignKey(DayShift, related_name='to_dayShift')

我希望能够获得Day.day，Shift.shift和DayShift.time。

我的prefetch_related错了吗？在prefetch_related：

之后看到这个是否可以

if visitingQuerySet:

我的意思是这会导致任何额外的DB点击，或者这将是实际评估它的第一个点吗？

目前，我可以看到为该部分执行的这两个查询：

SELECT 
    health_clinicdoctor.id, 
    health_clinicdoctor.doctor_id, 
    health_clinicdoctor.clinic_id, 
    health_clinicdoctor.is_active 
FROM health_clinicdoctor 
WHERE health_clinicdoctor.doctor_id = 14

SELECT 
    (health_clinicdoctordayshift.clinic_doctor_id) AS _prefetch_related_val_clinic_doctor_id, 
    health_dayshift.id, 
    health_dayshift.time, 
    health_dayshift.day_id, 
    health_dayshift.shift_id
 FROM health_dayshift 
 INNER JOIN health_clinicdoctordayshift 
    ON ( health_dayshift.id = health_clinicdoctordayshift.day_shift_id ) 
 WHERE health_clinicdoctordayshift.clinic_doctor_id IN  (1, 2, 3)

请帮助。

由于

Django：无法访问模板中的prefetch_related值

0 个答案: