DJANGO：在模板中显示多对多的附加字段

Posted 2023-02-24

【中文标题】DJANGO：在模板中显示多对多的附加字段

【英文标题】：DJANGO: Showing many-to-many additional fields in template

【发布时间】：2012-03-29 09:36:58

【问题描述】：

我有以下情况：一个项目可以属于多个部门，员工被分配到多个项目的角色。如何在模板中显示角色字段？ employees.role 显示空白...

模型

class Projects(models.Model):
    name = models.CharField(max_length=20)

class Department(models.Model):
    name = models.CharField(max_length=20)

class Employees(models.Model):
    fname = models.CharField(max_length=15)

class Departmentprojects(models.Model):
    department = models.ForeignKey(Department)
    projects = models.ForeignKey(Projects)
    members = models.ManyToManyField(Employee, through='Membership')

class Membership(models.Model):
    departmentprojects = models.ForeignKey(Departmentprojects)
    employee = models.ForeignKey(Employee)
    role = models.CharField(max_length=20) #i want to show this field in a template

查看

def department_detail(request, company_id):
department = get_object_or_404(Department, pk=department_id)
return render_to_response('test/detail.html', 'department': department)

模板

<h1> department.name </h1>

% for projects in department.departmentprojects_set.all %
    <h2> projects.projects </h2>
        <ul>
            % for employees in projects.members.all %
                <li> employee  |  employee.role </li>
            % endfor %
        </ul>
% endfor %

【问题讨论】：

你在模板的一个地方有employees，在另一个地方有employee。

【参考方案1】：

迭代“通过”模型而不是目标模型：

% for membership in projects.membership_set.all %
<li>
    membership.employee  |  membership.role 
</li>
% endfor %

【讨论】：

我通过使用 % for employees in projects.membership_set.all % 而不是使用 % for employees in projects.members.all % 解决了这个问题。不知道有什么区别，但它有效！