mirror of
https://github.com/django/django.git
synced 2024-12-25 10:35:48 +00:00
1889db475d
git-svn-id: http://code.djangoproject.com/svn/django/trunk@5154 bcc190cf-cafb-0310-a4f2-bffc1f526a37
106 lines
2.9 KiB
Python
106 lines
2.9 KiB
Python
"""
|
|
17. Custom column/table names
|
|
|
|
If your database column name is different than your model attribute, use the
|
|
``db_column`` parameter. Note that you'll use the field's name, not its column
|
|
name, in API usage.
|
|
|
|
If your database table name is different than your model name, use the
|
|
``db_table`` Meta attribute. This has no effect on the API used to
|
|
query the database.
|
|
|
|
If you need to use a table name for a many-to-many relationship that differs
|
|
from the default generated name, use the ``db_table`` parameter on the
|
|
ManyToMany field. This has no effect on the API for querying the database.
|
|
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
class Author(models.Model):
|
|
first_name = models.CharField(maxlength=30, db_column='firstname')
|
|
last_name = models.CharField(maxlength=30, db_column='last')
|
|
|
|
def __str__(self):
|
|
return '%s %s' % (self.first_name, self.last_name)
|
|
|
|
class Meta:
|
|
db_table = 'my_author_table'
|
|
ordering = ('last_name','first_name')
|
|
|
|
class Article(models.Model):
|
|
headline = models.CharField(maxlength=100)
|
|
authors = models.ManyToManyField(Author, db_table='my_m2m_table')
|
|
|
|
def __str__(self):
|
|
return self.headline
|
|
|
|
class Meta:
|
|
ordering = ('headline',)
|
|
|
|
__test__ = {'API_TESTS':"""
|
|
# Create a Author.
|
|
>>> a = Author(first_name='John', last_name='Smith')
|
|
>>> a.save()
|
|
|
|
>>> a.id
|
|
1
|
|
|
|
# Create another author
|
|
>>> a2 = Author(first_name='Peter', last_name='Jones')
|
|
>>> a2.save()
|
|
|
|
# Create an article
|
|
>>> art = Article(headline='Django lets you build web apps easily')
|
|
>>> art.save()
|
|
>>> art.authors = [a, a2]
|
|
|
|
# Although the table and column names on Author have been set to
|
|
# custom values, nothing about using the Author model has changed...
|
|
|
|
# Query the available authors
|
|
>>> Author.objects.all()
|
|
[<Author: Peter Jones>, <Author: John Smith>]
|
|
|
|
>>> Author.objects.filter(first_name__exact='John')
|
|
[<Author: John Smith>]
|
|
|
|
>>> Author.objects.get(first_name__exact='John')
|
|
<Author: John Smith>
|
|
|
|
>>> Author.objects.filter(firstname__exact='John')
|
|
Traceback (most recent call last):
|
|
...
|
|
TypeError: Cannot resolve keyword 'firstname' into field. Choices are: article, id, first_name, last_name
|
|
|
|
>>> a = Author.objects.get(last_name__exact='Smith')
|
|
>>> a.first_name
|
|
'John'
|
|
>>> a.last_name
|
|
'Smith'
|
|
>>> a.firstname
|
|
Traceback (most recent call last):
|
|
...
|
|
AttributeError: 'Author' object has no attribute 'firstname'
|
|
>>> a.last
|
|
Traceback (most recent call last):
|
|
...
|
|
AttributeError: 'Author' object has no attribute 'last'
|
|
|
|
# Although the Article table uses a custom m2m table,
|
|
# nothing about using the m2m relationship has changed...
|
|
|
|
# Get all the authors for an article
|
|
>>> art.authors.all()
|
|
[<Author: Peter Jones>, <Author: John Smith>]
|
|
|
|
# Get the articles for an author
|
|
>>> a.article_set.all()
|
|
[<Article: Django lets you build web apps easily>]
|
|
|
|
# Query the authors across the m2m relation
|
|
>>> art.authors.filter(last_name='Jones')
|
|
[<Author: Peter Jones>]
|
|
|
|
"""}
|