Question

from django.db import models
class doctors(models.Model):
    docid = models.AutoField(primary_key=True, unique=True) # Need autoincrement, unique and primary
    name = models.CharField(max_length=35)
    regid = models.CharField(max_length=15, default="")
    photo = models.CharField(max_length=35, default="")
    email = models.EmailField(default="")
    phone = models.IntegerField(default=0, null=True)
    qualifications = models.CharField(max_length=50, default="")
    about = models.CharField(max_length=35, default="")
    specialities = models.CharField(max_length=50, default="")
    department = models.CharField(max_length=50, default="ENT")
    fees = models.FloatField(default=300.0, null=True)
    displayfee = models.IntegerField(default=0, null=True)
    slotrange = models.CharField(max_length=50)
    slotdurn = models.IntegerField(default=10, null=True)
    breakrange = models.CharField(max_length=50, default="")
    slotsleft = models.CharField(max_length=50, default="")

我的意图：如果未指定电话，费用，显示费用或slotdurn等字段之一，则应使用默认值填写。不幸的是，当我执行以下操作时，这些值会自动填充为NULL：

from appointments.models import doctors
doc=doctors(name="Dr Joel", regid="12524", email="joel@mydomain.com")
doc.save()

我检查了创建的sql，就像这样：

CREATE TABLE `appointments_doctors` (
`docid` int(11) NOT NULL,
`name` varchar(35) NOT NULL,
`regid` varchar(15) NOT NULL,
`photo` varchar(35) NOT NULL,
`email` varchar(254) NOT NULL,
`phone` int(11) DEFAULT NULL,
`qualifications` varchar(50) NOT NULL,
`about` varchar(35) NOT NULL,
`specialities` varchar(50) NOT NULL,
`department` varchar(50) NOT NULL,
`fees` double DEFAULT NULL,
`displayfee` int(11) DEFAULT NULL,
`slotrange` varchar(50) NOT NULL,
`slotdurn` int(11) DEFAULT NULL,
`breakrange` varchar(50) NOT NULL,
`slotsleft` varchar(50) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

似乎我指定的默认值被Null值覆盖。我添加了null，因为以前曾提示我这些字段不能为null，即使我指定了默认值也是如此。

编辑：删除浮点后，我的类如下：

class doctors(models.Model):
    docid = models.AutoField(primary_key=True, unique=True) # Need autoincrement, unique and primary
    name = models.CharField(max_length=35)
    regid = models.CharField(max_length=15, default="")
    photo = models.CharField(max_length=35, default="")
    email = models.EmailField(default="")
    phone = models.IntegerField(default=0)
    qualifications = models.CharField(max_length=50, default="")
    about = models.CharField(max_length=35, default="")
    specialities = models.CharField(max_length=50, default="")
    department = models.CharField(max_length=50, default="ENT")
    fees = models.FloatField(default=300.0)
    displayfee = models.IntegerField(default=0)
    slotrange = models.CharField(max_length=50)
    slotdurn = models.IntegerField(default=10)
    breakrange = models.CharField(max_length=50, default="")
    slotsleft = models.CharField(max_length=50, default="")

迁移脚本如下：

class Migration(migrations.Migration):

    dependencies = [
        ('appointments', '0006_auto_20180726_0502'),
    ]

    operations = [
        migrations.AlterField(
            model_name='doctors',
            name='displayfee',
            field=models.IntegerField(default=0),
        ),
        migrations.AlterField(
            model_name='doctors',
            name='fees',
            field=models.FloatField(default=300.0),
        ),
        migrations.AlterField(
            model_name='doctors',
            name='phone',
            field=models.IntegerField(default=0),
        ),
        migrations.AlterField(
            model_name='doctors',
            name='slotdurn',
            field=models.IntegerField(default=10),
        ),
    ]

但是生成的sql仍然没有默认值。如何在模型中指定这些参数并将其迁移到sql？我在python 3.6.5上使用django 2.0.7。

创建模型的正确方法是什么？

如何使用Django模型为float字段设置默认值？

0 个答案: