admin template for manytomany

Question

I have a manytomany relationship between publication and pathology. Each publication can have many pathologies. When a publication appears in the admin template, I need to be able to see the many pathologies associated with that publication. Here is the model statement:

class Pathology(models.Model):
    pathology = models.CharField(max_length=100)
    def __unicode__(self):
        return self.pathology
    class Meta:
        ordering = ["pathology"]

class Publication(models.Model):
    pubtitle = models.TextField()
    pathology = models.ManyToManyField(Pathology)
    def __unicode__(self):
        return self.pubtitle
    class Meta:
        ordering = ["pubtitle"]

Here is the admin.py. I have tried variations of the following, but always get an error saying either publication or pathology doesn't have a foreign key associated.

from myprograms.cpssite.models import Pathology
class PathologyAdmin(admin.ModelAdmin):
    # ...
    list_display = ('pathology', 'id')

admin.site.register(Pathology, PathologyAdmin)

class PathologyInline(admin.TabularInline):
    #...
    model = Pathology
    extra = 3

class PublicationAdmin(admin.ModelAdmin):
    # ...
    ordering = ('pubtitle', 'year')
    inlines = [PathologyInline]
admin.site.register(Publication,PublicationAdmin)

Thanks for any help.

Answer 1

Unless you are using a intermediate table as documented here http://docs.djangoproject.com/en/dev/ref/contrib/admin/#working-with-many-to-many-intermediary-models, I don't think you need to create an Inline class. Try removing the line includes=[PathologyInline] and see what happens.

Answer 2

Hello,

I realize now that Django is great for the administration (data entry) of a website, simple searching and template inheritance, but Django and Python are not very good for complex web applications, where data is moved back and forth between a database and an html template. I have decided to combine Django and PHP, hopefully, applying the strengths of both. Thanks for you help!

Answer 3

That looks more like a one-to-many relationship to me, tho I'm somewhat unclear on what exactly Pathologies are. Also, so far as I understand, Inlines don't work on manytomany. That should work if you flip the order of the models, remove the manytomany and add a ForeignKey field to Publication in Pathology.

class Publication(models.Model):
    pubtitle = models.TextField()
    def __unicode__(self):
        return self.pubtitle
    class Meta:
        ordering = ["pubtitle"]

class Pathology(models.Model):
    pathology = models.CharField(max_length=100)
    publication = models.ForeignKey(Publication)
    def __unicode__(self):
        return self.pathology
    class Meta:
        ordering = ["pathology"]