Hello i have manytomany relations (database PostgreSql 8.1.5) like
this:
class Photograph(models.Model):
name = models.CharField(maxlength=200)
email = models.EmailField()
age = models.IntegerField()
categories = models.ManyToManyField(Category)
joined = models.DateField()
albums = models.IntegerField()
photos = models.IntegerField()
county = models.ForeignKey(County)
city = models.ForeignKey(City)
class Category(models.Model):
name = models.CharField(maxlength=15)
I create some Categories like that:
category = Category(name='weddings')
category.save()
and then I create a photograph and here is a problem:
In [8]: p = Photograph(name="p", email="[EMAIL PROTECTED]",albums=26,
photos=12,city=city, county=county, categories=category)
---------------------------------------------------------------------------
exceptions.TypeError Traceback (most
recent call last)
C:\opt\Python24\lib\site-packages\django-0.95-py2.4.egg\django\db\models\base.py
in __init__(self, *args, **kwargs)
123 pass
124 if kwargs:
--> 125 raise TypeError, "'%s' is an invalid keyword
argument for this function" % kwargs.keys()[0]
126 for i, arg in enumerate(args):
127 setattr(self, self._meta.fields[i].attname, arg)
TypeError: 'categories' is an invalid keyword argument for this
function
or if try to save:
Photograph.save()
In [19]: p = Photograph(name="Smith",email="[EMAIL PROTECTED]",albums=26,
photos=34, county=woj, city=miasto)
In [20]: p.save()
---------------------------------------------------------------------------
psycopg.ProgrammingError Traceback (most
recent call last)
I:\Prace\PRYWATNE\DJANGO_projekty\moremoments\<ipython console>
C:\opt\Python24\lib\site-packages\django-0.95-py2.4.egg\django\db\models\base.py
in save(self)
202 cursor.execute("INSERT INTO %s (%s) VALUES
(%s)" % \
203 (backend.quote_name(self._meta.db_table),
','.join(field_names),
--> 204 ','.join(placeholders)), db_values)
205 else:
206 # Create a new record with defaults for
everything.
C:\opt\Python24\lib\site-packages\django-0.95-py2.4.egg\django\db\backends\util.py
in execute(self, sql, params)
10 start = time()
11 try:
---> 12 return self.cursor.execute(sql, params)
13 finally:
14 stop = time()
ProgrammingError: ERROR: null value in column "age" violates not-null
constraint
INSERT INTO "mm_photograph"
("name","email","age","joined","albums","photos","county_id","city_id")
VALUES ('Smith','smi
[EMAIL PROTECTED]',NW
or i try to add category:
n [21]: p.categories.add(kategoria)
--------------------------------------------------------------------------
xceptions.ValueError Traceback (most
recent call last)
:\Prace\PRYWATNE\DJANGO_projekty\moremoments\<ipython console>
:\opt\Python24\lib\site-packages\django-0.95-py2.4.egg\django\db\models\fields\related.py
in __get__(self, instance, in
tance_type)
437 join_table=qn(self.field.m2m_db_table()),
438 source_col_name=qn(self.field.m2m_column_name()),
-> 439 target_col_name=qn(self.field.m2m_reverse_name())
440 )
441
:\opt\Python24\lib\site-packages\django-0.95-py2.4.egg\django\db\models\fields\related.py
in __init__(self, model, core
filters, instance, symmetrical, join_table, source_col_name,
target_col_name)
276 self._pk_val = self.instance._get_pk_val()
277 if self._pk_val is None:
-> 278 raise ValueError("%r instance needs to have a
primary key value before a many-to-many relationsh
p can be used." % model)
279
280 def get_query_set(self):
ValueError: <class 'moremoments.mm.models.Category'> instance needs to
have a primary key value before a many-to-many re
ationship can be used.
So what I'm doing wrong??
Any one help me, please
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