Question

所以我有这两个型号。我的课程模型与ManytoMany字段链接到ax.xaxis.set_tick_params(length=0,labelbottom=False)。当我尝试在模板中渲染教师时，不会显示任何结果。有什么问题？

TeacherData

class TeacherData(models.Model):
    name = models.CharField(max_length=30)
    surname = models.CharField(max_length=50)
    teacher_ID = models.CharField(unique=True, max_length=14)
    notes = models.CharField(max_length=255, default=None, blank=True)

    class Meta:
        verbose_name = "Teacher Data"
        verbose_name_plural = "Teachers Data"

    def __str__(self):
        return self.surname

class Course(models.Model):
    study_programme = models.ForeignKey('StudyProgramme', on_delete=models.CASCADE, default='')
    name = models.CharField(max_length=50, unique=True)
    ects = models.PositiveSmallIntegerField(validators=[MaxValueValidator(99)])
    description = models.TextField()
    year = models.PositiveSmallIntegerField(validators=[MaxValueValidator(99)])
    semester = models.IntegerField(choices=((1, "1"),
                                            (2, "2"),
                                            ), default=None)
    teacher = models.ManyToManyField('TeacherData', verbose_name="Taught By")
    slug = models.SlugField(max_length=140, unique=True)

    def __str__(self):
        return self.name

<ul>
        {% for c in courses.all %}
            <li>{{ c.study_programme }}</li>
            <li>{{ c.name }}</li>
            <li>{{ c.ects }}</li>
            <li>{{ c.description }}</li>
            <li>{{ c.year }}</li>
            <li>{{ c.semester }}</li>
            <li>{{ c.teacher }}</li>
        {% endfor %}
    </ul>

Answer 1

在您的模板中，c.teacher将是Django的ManyToMany- 经理（如课程。对象是经理）。我想这只会被渲染成一个空字符串。请尝试使用c.teacher.all。这将为您提供与课程相关的所有教师的 QuerySet 。

如果您需要更精细的模板，这里是主要结构：

<ul>
    {% for c in courses.all %}
        <li>{{ c.study_programme }}</li>
        <li>{{ c.name }}</li>
        <li>{{ c.ects }}</li>
        <li>{{ c.description }}</li>
        <li>{{ c.year }}</li>
        <li>{{ c.semester }}</li>
        <li><ul>
            {% for t in c.teacher.all %}
                <li>{{ t.name }} {# or whatever else you want to display #}</li>
            {% endfor %}
        </ul></li>
    {% endfor %}
</ul>

还有一个旁注：由于教师课程是M2M，因此给该字段赋予复数名称会更方便（和通常做法）：Course.teachers

ManyToManyField在模板中返回空字符串

1 个答案: