Question

我是Django的首发并且已经遇到了问题：

我创建了这个模型：

from django.db import models
from django.utils import timezone
import datetime
# Create your models here.

class Receta(models.Model):
    receta_text = models.CharField(max_length=100)
    pub_date = models.DateTimeField('date published')
    def was_published_recently(self):
        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
    def __unicode__(self):  # Python 3: def __str__(self):
        return self.receta_text

class Ingredientes(models.Model):
    receta = models.ForeignKey(Receta)
    ingrediente_text = models.CharField(max_length=100)
    calorias = models.FloatField(default=0.0)
    hidratos = models.FloatField(default=0.0)
    def __unicode__(self):  # Python 3: def __str__(self):
        return self.ingrediente_text

但是，我有以下错误：任何想法错误可能是什么？

PD：我在django教程

中包含了完整的过程

由于

rcastillo135@Michinin:~/django_learn/nutritest$ python manage.py sql recetas
    BEGIN;
    CREATE TABLE "recetas_receta" (
        "id" integer NOT NULL PRIMARY KEY,
        "receta_text" varchar(100) NOT NULL,
        "pub_date" datetime NOT NULL
    )
    ;
    CREATE TABLE "recetas_ingredientes" (
        "id" integer NOT NULL PRIMARY KEY,
        "receta_id" integer NOT NULL REFERENCES "recetas_receta" ("id"),
        "ingrediente_text" varchar(100) NOT NULL,
        "calorias" real NOT NULL,
        "hidratos" real NOT NULL
    )
    ;

    COMMIT;
    rcastillo135@Michinin:~/django_learn/nutritest$ python manage.py validate
    0 errors found
    rcastillo135@Michinin:~/django_learn/nutritest$ python manage.py syncdb
    Creating tables ...
    Installing custom SQL ...
    Installing indexes ...
    Installed 0 object(s) from 0 fixture(s)
    rcastillo135@Michinin:~/django_learn/nutritest$ python manage.py shell
    Python 2.7.3 (default, Sep 26 2013, 20:08:41) 
    [GCC 4.6.3] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    (InteractiveConsole)
    >>> from recetas.models import Receta,Ingredientes
    >>> p=Receta.objects.get(id=1)
    >>> p
    <Receta: Pollo>
    >>> p.ingredientes_set.all()
    Traceback (most recent call last):
      File "<console>", line 1, in <module>
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 71, in __repr__
        data = list(self[:REPR_OUTPUT_SIZE + 1])
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 96, in __iter__
        self._fetch_all()
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 854, in _fetch_all
        self._result_cache = list(self.iterator())
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 220, in iterator
        for row in compiler.results_iter():
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 710, in results_iter
        for rows in self.execute_sql(MULTI):
      File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 781, in execute_sql
        cursor.execute(sql, params)
      File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 69, in execute
        return super(CursorDebugWrapper, self).execute(sql, params)
      File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 53, in execute
        return self.cursor.execute(sql, params)
      File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 99, in __exit__
        six.reraise(dj_exc_type, dj_exc_value, traceback)
      File "/usr/local/lib/python2.7/dist-packages/django/db/backends/util.py", line 53, in execute
        return self.cursor.execute(sql, params)
      File "/usr/local/lib/python2.7/dist-packages/django/db/backends/sqlite3/base.py", line 450, in execute
        return Database.Cursor.execute(self, query, params)
    OperationalError: no such column: recetas_ingredientes.receta_id
    >>>

非常感谢！

Answer 1

您可能在添加syncdb ForeignKey之前创建了模型并运行receta。 syncdb不会修改已创建的表。由于您只是在试验，您可以删除已有的db表并再次运行syncdb以从头开始重新创建它们。

您可以使用第三方South项目来管理数据库迁移 - 此功能的一个版本将包含在2014年发布的Django 1.7中。

django - 最新 - 第一步，奇怪的错误

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