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POConfiguring Many-to-many field in django admin with related_name
 

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  1. POConfiguring Many-to-many field in django admin with related_name
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    <p>I have the following model and admin defined in djando 1.5. This is a many-to-many relationship between subnet and vlan. I use the related_name option in the ManyToMany field to be able to get the collection of vlan from the related subnet object. Adding subnet to vlans from the admin works well. However when I try to add an horizontal_filer to the subnet admin in order to add van to its vlan set I get an error saying that the vlans attribute doesn't exist. I'm using subnet object in some view and I can access the vlans attribute just right.</p> <p>What am I doing wrong here ? I've seen similar post but I couldn't adapt any of the proposed solution with success.</p> <p>Thanks for your help</p> <p>model.py</p> <pre><code>from django.db import models class Subnet(models.Model): networkAddress = models.CharField(max_length=15) size = models.IntegerField() def __unicode__(self): return "%s/%s" % (self.networkAddress, self.size) class IpAddress(models.Model): ipAddress = models.CharField(max_length=15) subnet = models.ForeignKey(Subnet) def __unicode__(self): return "%s" % (self.ipAddress) class Vlan(models.Model): number = models.IntegerField() description = models.CharField(max_length=150) subnets = models.ManyToManyField(Subnet, related_name='vlans', blank=True) def __unicode__(self): return "VLAN %s (%s)" % (self.number, self.description) </code></pre> <p>admin.py </p> <pre><code>from network.models import Subnet, IpAddress, Vlan from django.contrib import admin class SubnetAdmin(admin.ModelAdmin): filter_horizontal = ('vlans',) admin.site.register(Subnet, SubnetAdmin) admin.site.register(IpAddress) admin.site.register(Vlan) </code></pre> <p>and the error I get</p> <pre><code>Request Method: GET Request URL: http://127.0.0.1:8000/admin/ Django Version: 1.5.2 Exception Type: ImproperlyConfigured Exception Value: 'SubnetAdmin.filter_horizontal' refers to field 'vlans' that is missing from model 'network.Subnet'. </code></pre>
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    1. COI had the exact same problem yesterday. I just solved it by moving the ManyToMany declaration to the other model. Maybe you can try creating a model method that returns `self.vlans`.
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    2. COWell, If I change de ManyToManyField to the other model, I get the same problem the other way arround. In this case I really want to be able to edit the relation from both ends
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    3. COSo then i'd try the model method method
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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