django增加数据时报错(1062, "Duplicate entry '4' for key 'employee_employee.info_id'")

增加数据报错

views部分代码：


def add_employee_old(request):
    if request.method == "POST":
        name = request.POST.get("name")
        email = request.POST.get("email")
        dep = request.POST.get("dep")
        info = request.POST.get("info")
        salary = request.POST.get("salary")
        #取得多个值
        groups = request.POST.getlist("group")
        new_emp = employee.objects.create(name = name,email = email,salary = salary,dep_id = dep,info_id = info)
        #给多对多键字段赋值
        new_emp.group.set(groups)
        return redirect('/test_orm_old/list_employee_old/')
    dep_list = department.objects.all()
    group_list = group.objects.all()
    info_list = employeeinfo.objects.all()
    return render(request,'test_orm_old/add_employee_old.html',{'dep_list':dep_list,'group_list':group_list,'info_list':info_list})

add_employee_old.html代码：


<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>增加</title> 
    </head>
    <body>
      <div align="center">
          <h1>增加员工</h1>
          <hr>
          <form action="/test_orm_old/add_employee_old/" method="post">
              {% csrf_token %}
              <div>
                  <label>姓名：</label><input type="text" name="name" id="name">
              </div>
              <br>
              <div>
                  <label>邮箱：</label><input type="text" name="email" id="email">
              </div>
              <br>
              <div>
                  <label>薪水：</label><input type="text" name="salary" id="salary">
              </div>
              <br>
              <div>
                  <label>联系信息：</label>
                  <select name="info" id="info">
                      {% for info in info_list %}
                      <option value="{{ info.id }}">{{ info.phone }}||{{ info.address }}</option>
                      {% endfor %}
                  </select>
              </div>
              <br>
              <div>
                  <label>部门：</label>
                  <select name="dep" id="dep">
                      {% for dep in dep_list %}
                      <option value="{{ dep.id }}">{{ dep.dep_name }}</option>
                      {% endfor %}
                  </select>
              </div>
              <br>
              <div>
                  <label>团体：</label>
                  <!-- 字段group是多对多键，设置<select>标签属性multiple="true",允许多选 -->
                  <select name="group" id="group" multiple="true">
                      {% for group in group_list %}
                      <option value="{{ group.id }}">{{ group.group_name }}</option>
                      {% endfor %}
                  </select>
              </div>
              <br>
              <div><input type="submit" value="增加"></div>
          </form>
      </div>  
    </body>
</html>

运行结果及报错内容：

点击保存后报错如下：
IntegrityError at /test_orm_old/add_employee_old/
(1062, "Duplicate entry '4' for key 'employee_employee.info_id'")
Request Method: POST

1062, "Duplicate entry '4' for key 'employee_employee.info_id'" 这句话的意思是主键重复l 你输入5 试试看报错不