对于所有表格，会生成一些列，而某些列则没有。
这是我的模特
personalInfo.py
from django.db import models
# Create your models here.
class Students(models.Model):
student_name = models.CharField(max_length=100)
student_id = models.CharField(max_length=50)
student_dept = models.CharField(max_length=30)
student_sec = models.CharField(max_length=2)
class StudentDetails(models.Model):
students = models.ForeignKey(Students, on_delete=models.CASCADE)
present_address = models.TextField
permanent_address = models.TextField
student_phone = models.BigIntegerField
gpo_box_number = models.IntegerField
class Teachers(models.Model):
teacher_name = models.CharField(max_length=100)
teacher_id = models.CharField(max_length=50)
teacher_dept = models.CharField(max_length=30)
class TeacherDetails(models.Model):
teachers = models.ForeignKey(Teachers, on_delete=models.CASCADE)
present_address = models.TextField
permanent_address = models.TextField
teacher_phone = models.BigIntegerField
gpo_box_number = models.IntegerField
studentAdvising.py
from django.db import models
from personalInfo.models import Students, Teachers
# Create your models here.
class Advising(models.Model):
student = models.ForeignKey(Students, on_delete=models.CASCADE)
teacher = models.ForeignKey(Teachers, on_delete=models.CASCADE)
subject_matter = models.CharField(max_length=400)
comment = models.TextField
starting_time = models.TimeField
ending_time = models.TimeField
date = models.DateField
personalInfo.py
的迁移详细信息# Generated by Django 2.0 on 2018-01-03 17:43
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
initial = True
dependencies = [
]
operations = [
migrations.CreateModel(
name='StudentDetails',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
],
),
migrations.CreateModel(
name='Students',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('student_name', models.CharField(max_length=100)),
('student_id', models.CharField(max_length=50)),
('student_dept', models.CharField(max_length=30)),
('student_sec', models.CharField(max_length=2)),
],
),
migrations.CreateModel(
name='TeacherDetails',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
],
),
migrations.CreateModel(
name='Teachers',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('teacher_name', models.CharField(max_length=100)),
('teacher_id', models.CharField(max_length=50)),
('teacher_dept', models.CharField(max_length=30)),
],
),
migrations.AddField(
model_name='teacherdetails',
name='teachers',
field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='personalInfo.Teachers'),
),
migrations.AddField(
model_name='studentdetails',
name='students',
field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='personalInfo.Students'),
),
]
studentAdvising的迁移详细信息
# Generated by Django 2.0 on 2018-01-03 17:43
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
initial = True
dependencies = [
('personalInfo', '0001_initial'),
]
operations = [
migrations.CreateModel(
name='Advising',
fields=[
('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
('subject_matter', models.CharField(max_length=400)),
('student', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='personalInfo.Students')),
('teacher', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='personalInfo.Teachers')),
],
),
]
数据库中的表，
mysql> show tables;
+-----------------------------+
| Tables_in_studentAdvising |
+-----------------------------+
| auth_group |
| auth_group_permissions |
| auth_permission |
| auth_user |
| auth_user_groups |
| auth_user_user_permissions |
| django_admin_log |
| django_content_type |
| django_migrations |
| django_session |
| personalInfo_studentdetails |
| personalInfo_students |
| personalInfo_teacherdetails |
| personalInfo_teachers |
| studentAdvisingApp_advising |
+-----------------------------+
15 rows in set (0.00 sec)
mysql> SHOW COLUMNS FROM personalInfo_students;
+--------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| student_name | varchar(100) | NO | | NULL | |
| student_id | varchar(50) | NO | | NULL | |
| student_dept | varchar(30) | NO | | NULL | |
| student_sec | varchar(2) | NO | | NULL | |
+--------------+--------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
mysql> SHOW COLUMNS FROM personalInfo_studentdetails;
+-------------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| students_id | int(11) | NO | MUL | NULL | |
+-------------+---------+------+-----+---------+----------------+
2 rows in set (0.00 sec)
mysql> SHOW COLUMNS FROM personalInfo_teachers;
+--------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| teacher_name | varchar(100) | NO | | NULL | |
| teacher_id | varchar(50) | NO | | NULL | |
| teacher_dept | varchar(30) | NO | | NULL | |
+--------------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
mysql> SHOW COLUMNS FROM personalInfo_teacherdetails;
+-------------+---------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+---------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| teachers_id | int(11) | NO | MUL | NULL | |
+-------------+---------+------+-----+---------+----------------+
2 rows in set (0.00 sec)
mysql> SHOW COLUMNS FROM studentAdvisingApp_advising;
+----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| subject_matter | varchar(400) | NO | | NULL | |
| student_id | int(11) | NO | MUL | NULL | |
| teacher_id | int(11) | NO | MUL | NULL | |
+----------------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
我无法理解问题所在。谷歌上没有关于它的好信息。我该怎么办？
答案 0 :(得分：0)
在您的课程定义中，您可以编写如下内容：
class TeacherDetails(models.Model):
teachers = models.ForeignKey(Teachers, on_delete=models.CASCADE)
present_address = models.TextField # call missing
permanent_address = models.TextField # call missing
teacher_phone = models.BigIntegerField # call missing
gpo_box_number = models.IntegerField # call missing因此缺少构造函数的调用。您未将present_address与TextField 实例相关联，而是将其与TextField类型相关联。
你需要修改构造函数，所以：
class TeacherDetails(models.Model):
teachers = models.ForeignKey(Teachers, on_delete=models.CASCADE)
present_address = models.TextField() # call to constructor
permanent_address = models.TextField() # call to constructor
teacher_phone = models.BigIntegerField() # call to constructor
gpo_box_number = models.IntegerField() # call to constructor Django将查找与Model的{{1}}子类关联的属性，这些子类是Field的实例（不是对Field的（子）类的引用）。然后将它们映射到数据库中的列。