python - Django ManyToManyField not saving in admin -

models.py

class document(models.model): document_type_d = models.foreignkey(documenttype,                                     verbose_name="document type")  class section(models.model): document_type_s = models.manytomanyfield(documenttype,                                          verbose_name="document type")  class documenttype(models.model): document_type_dt = models.charfield("document type", max_length=240) 

when create section in admin doesn't appear save document_type_s.

in django shell can see documenttype saving properly:

>>> dt = documenttype.objects.all() >>> d in dt: ...     print d.document_type_dt ...  campus lan wan unified communications 

when check sections get:

>>> original_sections = section.objects.all() >>> in original_sections: ...     print a.document_type_s ...  lld.documenttype.none lld.documenttype.none lld.documenttype.none lld.documenttype.none lld.documenttype.none lld.documenttype.none lld.documenttype.none lld.documenttype.none 

and when check documents:

>>> d = document.objects.all() >>> e in d: ...     print e.document_type_d ...  campus lan wan campus lan 

and if try create new section:

>>> s = section(document_type_s="campus lan", name="fake", original=true) traceback (most recent call last):   file "<console>", line 1, in <module>   file "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 480, in __init__     raise typeerror("'%s' invalid keyword argument function" % list(kwargs)[0]) typeerror: 'document_type_s' invalid keyword argument function 

django appears have created field in database, looking @ migrations file:

migrations.createmodel(             name='section',             fields=[                 ('id', models.autofield(verbose_name='id', serialize=false, auto_created=true, primary_key=true)),                 ('document_type_s', models.manytomanyfield(to='lld.documenttype', verbose_name=b'document type')),             ] 

i don't know causing this?

how think going work?

section(document_type_s="campus lan", name="fake", original=true) 

document_type_s manytomany field passing in string value

read docs manytomany:
https://docs.djangoproject.com/en/1.8/topics/db/examples/many_to_many/

for many many relation created section instance has exist (because in db m2m relation table 2 foreign keys)... need to:

dt = documenttype.objects.get(pk=1) section = section.objects.create(name="fake", original=true) section.document_type_s.add(dt)