若依框架实现学生请销假管理系统代码

以下是一个简单的学生请销假管理系统的代码示例，使用的是 Django 框架：

### models.py

from django.db import models
from django.contrib.auth.models import User

class Student(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    student_id = models.CharField(max_length=20)
    department = models.CharField(max_length=50)
    grade = models.CharField(max_length=20)

    def __str__(self):
        return self.user.username

class Leave(models.Model):
    student = models.ForeignKey(Student, on_delete=models.CASCADE)
    start_date = models.DateField()
    end_date = models.DateField()
    reason = models.TextField()
    approved = models.BooleanField(default=False)

    def __str__(self):
        return self.student.user.username + ' - ' + self.reason

### forms.py

from django import forms
from .models import Leave

class LeaveForm(forms.ModelForm):
    class Meta:
        model = Leave
        fields = ['start_date', 'end_date', 'reason']
        widgets = {
            'start_date': forms.DateInput(attrs={'type': 'date'}),
            'end_date': forms.DateInput(attrs={'type': 'date'}),
        }

### views.py

from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Student, Leave
from .forms import LeaveForm

@login_required
def home(request):
    student = request.user.student
    leaves = Leave.objects.filter(student=student)
    return render(request, 'leaves/home.html', {'leaves': leaves})

@login_required
def new_leave(request):
    student = request.user.student
    if request.method == 'POST':
        form = LeaveForm(request.POST)
        if form.is_valid():
            leave = form.save(commit=False)
            leave.student = student
            leave.save()
            return redirect('leaves:home')
    else:
        form = LeaveForm()
    return render(request, 'leaves/new_leave.html', {'form': form})

@login_required
def leave_detail(request, leave_id):
    student = request.user.student
    leave = Leave.objects.get(id=leave_id)
    if student != leave.student:
        return redirect('leaves:home')
    return render(request, 'leaves/leave_detail.html', {'leave': leave})

@login_required
def leave_approve(request, leave_id):
    if not request.user.is_staff:
        return redirect('leaves:home')
    leave = Leave.objects.get(id=leave_id)
    leave.approved = True
    leave.save()
    return redirect('leaves:home')

### urls.py

from django.urls import path
from . import views

app_name = 'leaves'

urlpatterns = [
    path('', views.home, name='home'),
    path('new_leave/', views.new_leave, name='new_leave'),
    path('<int:leave_id>/', views.leave_detail, name='leave_detail'),
    path('<int:leave_id>/approve/', views.leave_approve, name='leave_approve'),
]

### templates

#### home.html

{% extends 'base.html' %}

{% block content %}
  <h1>My Leaves</h1>
  <a href="{% url 'leaves:new_leave' %}">New Leave</a>
  <ul>
    {% for leave in leaves %}
      <li>
        <a href="{% url 'leaves:leave_detail' leave.id %}">{{ leave.reason }}</a>
        {% if leave.approved %}<span style="color: green;">(Approved)</span>{% endif %}
      </li>
    {% empty %}
      <li>No leaves found.</li>
    {% endfor %}
  </ul>
{% endblock %}

#### new_leave.html

{% extends 'base.html' %}

{% block content %}
  <h1>New Leave</h1>
  <form method="POST">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Submit</button>
  </form>
{% endblock %}

#### leave_detail.html

{% extends 'base.html' %}

{% block content %}
  <h1>Leave Detail</h1>
  <p><strong>Reason:</strong> {{ leave.reason }}</p>
  <p><strong>Start Date:</strong> {{ leave.start_date }}</p>
  <p><strong>End Date:</strong> {{ leave.end_date }}</p>
  {% if not leave.approved %}
    {% if user.is_staff %}
      <a href="{% url 'leaves:leave_approve' leave.id %}">Approve</a>
    {% endif %}
  {% endif %}
{% endblock %}

这里只是一个简单的示例，实际项目中可能需要根据具体需求进行更多的功能扩展。