django 创建model（数据库表）失败

在models.py中创建数据库表

 

from django.db import models

# Create your models here.
class Book(models.Model):
    name = models.CharField(max_length=20)
    price = models.IntegerField
    pub_date = models.DateField

 

 

 

在terminal中 ：python manage.py makemigrations

 

返回结果：No changes detected

创建失败。

 

原因可能如下：

1. migration folder You need a migrations package in your app.
2. INSTALLED_APPS You need your app to be specified in the INSTALLED_APPS .dict
3. Verbosity start by running makemigrations -v 3 for verbosity. This might shed some light on the problem.
4. Full path In INSTALLED_APPS it is recommended to specify the full module app config path 'apply.apps.MyAppConfig'
5. --settings you might want to make sure the correct settings file is set: manage.py makemigrations --settings mysite.settings
6. specify app name explicitly put the app name in manage.py makemigrations myapp- that narrows down the migrations for the app alone and helps you isolate the problem.
7. model meta check you have the right app_label in your model meta
8. Debug django debug django core script. makemigrations command is pretty much straight forward. Here's how to do it in pycharm. change your script definition accordingly (ex: makemigrations --traceback myapp)

 

而我的情况是第二种 ：setting.py内的INSTALLED_APPS未添加 app名字

 

 

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
     'app1',
]

 

添加上后，创建成功