The first error is simple, university models is defined after your
department model, thus is not found, you can define the foreign key as
a string in the form of "appname.ModelName", so you will define it
like this:
class departments(models.Model):
university = models.ForeignKey("appname.university",
related_name="departments")
Where appname is the name of the application where the models are
being defined (the folder where models.py is stored).
About the other problem, it would be good to have a little more
context on what is socialmediacourses and where is throwing you the
error, but with the above change should do the trick, just don't
forget to remove your ManyToMany departments definition on University
model, that would make the name university.department clash.
Regards,
Carlos Ruvalcaba
On Sun, Nov 21, 2010 at 7:10 AM, Bruno Amaral <m...@brunoamaral.eu> wrote:
> Carlos, Thank you for this!
>
> Your solution is what I am looking for,but for some reason I get an
> error message:
> "NameError: name 'university' is not defined" <http://dpaste.com/
> 278024/>
>
> Figuring this could an issue with Python and not Django, i added
> university ='' to the top.
>
> The validate command returned the message:
> Error: One or more models did not validate:
> socialmediacourses.departments: 'university' has a relation with
> model , which has either not been installed or is abstract.
> socialmediacourses.university: Reverse query name for m2m field
> 'departments' clashes with field 'departments.university'. Add a
> related_name argument to the definition for 'departments'.
>
> what am I doing wrong?
>
> On Nov 21, 4:23 am, Carlos Daniel Ruvalcaba Valenzuela
> <clsdan...@gmail.com> wrote:
>> Depends on you requirements, you could have used a Foreign Key to the
>> University on the Department model and marking it as required, thus
>> there cannot be a Department without university and set the
>> related_name property on the ForeignKey to the "departments" so you
>> can access University.departments property for the list of
>> departments.
>>
>> You may not want this if you only want to have 1 kind of department
>> which will be linked to many universities, but I see this may not be
>> the case, thus your models may end like this:
>>
>> class departments(models.Model):
>>
>> GENDER = ((u'M', u'Male'),(u'F', u'Female'),)
>>
>> university = models.ForeignKey(university,
>> related_name="departments")
>> name = models.CharField(max_length=60)
>> head_name = models.CharField(max_length=60)
>> head_email = models.EmailField(max_length=60)
>> head_gender = models.CharField(max_length=2, choices=GENDER)
>>
>> Regards,
>> Carlos Ruvalcaba
>>
>>
>>
>> On Sat, Nov 20, 2010 at 6:19 PM, Bruno Amaral <m...@brunoamaral.eu> wrote:
>> > I have been trying to create a database for Universities, Departments
>> > and Courses.
>>
>> > The idea is that a University has many departments, which in turn have
>> > one or more courses.
>>
>> > So far, this model works:http://dpaste.com/277850/
>>
>> > With one caveat, it allows a department to exist without a University
>> > linked to it.
>>
>> > I am at a loss here, even after reading over all the documentation I
>> > could find on the website, does anyone have an idea on what I am doing
>> > wrong, or where I should look for a solution?
>>
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