如何在生产服务器中替换Django应用的models.py

Question

我有一个简单的Django应用，现在只用到了后台管理功能。现在服务器上的模型是这样的：

from django.db import models

class School(models.Model):    
    school = models.CharField(max_length=200)
    def __unicode__(self):
        return self.school

class Lawyer(models.Model):
    first = models.CharField(max_length=20)
    initial = models.CharField(blank=True, max_length=2)
    last = models.CharField(max_length=20)
    year_graduated = models.IntegerField('Year graduated')
    school = models.CharField(max_length=200)
    school = models.ForeignKey(School)
    class Meta:
        ordering = ('last',)
    def __unicode__(self):
        return self.first

我想添加两个新字段，所以新的 models.py 文件看起来会是这样：

from django.db import models

class School(models.Model):    
    school = models.CharField(max_length=300)
    def __unicode__(self):
        return self.school
class Lawyer(models.Model):
    firm_url = models.URLField('Bio', max_length=200)
    firm_name = models.CharField('Firm', max_length=100)
    first = models.CharField('First Name', max_length=50)
    last = models.CharField('Last Name', max_length=50)
    year_graduated = models.IntegerField('Year graduated')
    school = models.CharField(max_length=300)
    school = models.ForeignKey(School)
    class Meta:
        ordering = ('?',)
    def __unicode__(self):
        return self.first

其他的都没变。我可以直接把这个新的 models.py 上传到服务器上，然后期待应用能像之前一样正常工作吗？我还需要清空数据库里的内容。我现在用的是 sqlite3。

我尝试过部署一个新应用，但不幸的是，托管公司拒绝提供帮助。因为我不需要两个应用，所以我考虑替换 models.py。这个新应用在Django开发服务器上运行得很好。我希望能得到一些建议，因为在我让这个应用正常运行后，我会处理其他未解决的问题。谢谢！

编辑

感谢大家的回答。因为我想清空数据库，所以我会尝试 jcd 的解决方案。所以，我会在 models.py 中替换掉旧字段：

    first = models.CharField(max_length=20)
    initial = models.CharField(blank=True, max_length=2)
    last = models.CharField(max_length=20)
    year_graduated = models.IntegerField('Year graduated')
    school = models.CharField(max_length=200)
    school = models.ForeignKey(School)

用新的字段：

    firm_url = models.URLField('Bio', max_length=200)
    firm_name = models.CharField('Firm', max_length=100)
    first = models.CharField('First Name', max_length=50)
    last = models.CharField('Last Name', max_length=50)
    year_graduated = models.IntegerField('Year graduated')
    school = models.CharField(max_length=300)
    school = models.ForeignKey(School)

变成

from django.db import models

class School(models.Model):    
    school = models.CharField(max_length=200)
    def __unicode__(self):
        return self.school

class Lawyer(models.Model):
    firm_url = models.URLField('Bio', max_length=200)
    firm_name = models.CharField('Firm', max_length=100)
    first = models.CharField('First Name', max_length=50)
    last = models.CharField('Last Name', max_length=50)
    year_graduated = models.IntegerField('Year graduated')
    school = models.CharField(max_length=300)
    school = models.ForeignKey(School)
    class Meta:
        ordering = ('last',)
    def __unicode__(self):
        return self.first

然后把这个上传到服务器。接着我会运行 manage.py syncdb。

当我打开页面时，我会看到 admin 和之前一样，只是多了新字段。

我想更新 admin.py 来添加新字段应该没问题：

class LawyerAdmin(admin.ModelAdmin):
    fieldsets = [
        ('Name',   {'fields': ['first', 'last', 'firm_name', 'firm_url']}),
        ('School', {'fields': ['school', 'year_graduated']}),
    ]
    list_display = ('first', 'last', 'school', 'year_graduated', 'firm_name', 'firm_url')
    list_filter = ['year_graduated']
    #search_fields = ['last', 'first']
    search_fields = ['school__school']
    search_fields = ['school__lawyer__last']

再次感谢大家！

django 后台管理数据库迁移 models 服务器部署字段更新数据清空应用替换

如何在生产服务器中替换Django应用的models.py

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