我正在学校安置系统上工作，我有多个模型可供查询。首先，我想遍历学生列表，并检查个人资料和结果模型中两个学生的ID是否匹配。然后，我将检查学生是否已通过，然后安置该学生。
我正在使用Django 2.2.1。我做了很多搜索，但无济于事。以下是我的一些代码。
<div class="wrapper" style="width: 400px; height: 400px; display: flex; position: relative;">
<canvas></canvas>
<svg style="position: absolute" width="100%" height="100%">
<g transform="translate(200, 200)">
<circle cx="0" cy="0" r="30" fill="red"/>
<text x="-12" y="2" font-family="Arial" font-size="15px" fill="black">SVG</text>
</g>
</svg>
</div>
<script>
const canvas = document.querySelector('canvas');
const ctx = canvas.getContext('2d');
canvas.width = 400;
canvas.height = 400;
ctx.fillStyle = "pink"
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = 'black';
ctx.font = '20px Arial';
ctx.fillText("Canvas", canvas.width / 2, 50);
</script>
class StudentProfile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
# Extra Fields
student_ID = models.CharField(max_length=10)
middle_Name = models.CharField(max_length=50, blank=True)
gender = models.CharField(max_length=10, choices=STUDENT_GENDER_CHOICES)
disability = models.CharField(max_length=5, choices=STUDENT_DISABILITY_CHOICES)
locality = models.CharField(max_length=30, choices=STUDENT_LOCALITY_CHOICES)
age = models.PositiveIntegerField()
profile_picture = models.ImageField(upload_to='profile_photos', blank=True, default='profile_photos/default.svg')
def __str__(self):
return self.user.username
class StudentResultsUpload(models.Model):
# student = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
student_ID = models.CharField(max_length=10)
english = models.PositiveIntegerField()
mathematics = models.PositiveIntegerField()
integrated_Science = models.PositiveIntegerField()
social_Studies = models.PositiveIntegerField()
basic_Design_Technology = models.PositiveIntegerField()
home_Economics = models.PositiveIntegerField()
ghanaian_Language = models.PositiveIntegerField()
french = models.PositiveIntegerField(blank=True)
class SchoolSelectionOne(models.Model):
student = models.ForeignKey(User, on_delete=models.DO_NOTHING)
name_of_School = models.CharField(max_length=100)
program = models.CharField(max_length=50)
residential_Status = models.CharField(max_length=50, choices=RESIDENTIAL_STATUS_CHOICES)
def placement(request):
profile = StudentProfile.objects.all()
place = StudentResultsUpload.objects.all()
school_one = SchoolSelectionOne.objects.all()
school_two = SchoolSelectionTwo.objects.all()
school_three = SchoolSelectionThree.objects.all()
school_four = SchoolSelectionFour.objects.all()
school_five = SchoolSelectionFive.objects.all()
for candidate in profile:
if profile.student_ID == place.student_ID:
if (place.english >= 50 and place.mathematics >= 50 and place.integrated_Science >= 50 and place.social_Studies >= 50):
raw_score = (place.english + place.mathematics + place.integrated_Science + place.social_Studies + place.basic_Design_Technology + place.home_Economics)
for school in zip(school_one, school_two, school_three, school_four, school_five):
if raw_score >= 480:
place_me = school_one
elif raw_score >= 420:
place_me = school_two
elif raw_score >= 360:
place_me = school_three
elif raw_score >= 300:
place_me = school_four
else:
place_me = school_five
return render(request, 'schools/placement.html', {'place_me': place_me})
else:
return HttpResponse("You did not qualify for placement.")
我希望能够安置所有有资格获得安置的学生。
答案 0 :(得分：1)
如Daniel Roseman所示，您应该使用外键来关联不同的模型。重构代码应类似于以下代码。
let arr = person.map(x => {
return `My name is ${x.name}, I am ${x.nationality} and I am ${x.age}`;
})
arr.join(', ');
class StudentResultsUpload(models.Model):
student = models.ForeignKey(StudentProfile, on_delete=models.CASCADE, null=True)
english = models.PositiveIntegerField()
mathematics = models.PositiveIntegerField()
integrated_Science = models.PositiveIntegerField()
social_Studies = models.PositiveIntegerField()
basic_Design_Technology = models.PositiveIntegerField()
home_Economics = models.PositiveIntegerField()
ghanaian_Language = models.PositiveIntegerField()
french = models.PositiveIntegerField(blank=True)
在避免使用嵌套的放置功能中，我首先找到了每个候选人的所需信息（假设每个候选人都与学校关联并上传了模型），然后进行了计算。
答案 1 :(得分：0)
在这两行上
for candidate in profile:
if profile.student_ID == place.student_ID:
您表示要在循环内使用candidate作为变量名，因此第二行可能应读为if candidate.student_ID而不是if profile.student_ID。
答案 2 :(得分：0)
place是一个查询集。因此必须对其进行迭代。
尝试此代码：
def placement(request):
profile = StudentProfile.objects.all()
place = StudentResultsUpload.objects.all()
school_one = SchoolSelectionOne.objects.all()
school_two = SchoolSelectionTwo.objects.all()
school_three = SchoolSelectionThree.objects.all()
school_four = SchoolSelectionFour.objects.all()
school_five = SchoolSelectionFive.objects.all()
placements = []
for candidate in profile:
for pl in place:
if candidate.student_ID == pl.student_ID:
if (pl.english >= 50 and pl.mathematics >= 50 and pl.integrated_Science >= 50 and pl.social_Studies >= 50):
raw_score = (pl.english + pl.mathematics + pl.integrated_Science + pl.social_Studies + pl.basic_Design_Technology + pl.home_Economics)
if raw_score >= 480:
place_me = school_one
elif raw_score >= 420:
place_me = school_two
elif raw_score >= 360:
place_me = school_three
elif raw_score >= 300:
place_me = school_four
else:
place_me = school_five
placements.append({'student': candidate, 'school': place_me})
return render(request, 'schools/placement.html', {'place_me': placements})
placement.html：
<div class="container">
<p id="success">
Placement Here.
</p>
{% for placement in place_me %}
Stdudent Id: {{ placement.student.student_ID }}
Stdudent middle name: {{ placement.student.middle_Name }}
Stdudent gender: {{ placement.student.gender }}
Placements:
{% for school in placement.school %}
{{ school }}
{% endfor %}
{% endfor %}
</div>