Admin: Unknown fields

[Rolston Jeremiah]

Hello,

I am new to Python and Django so please bear with me.

I have  created a model(below) and would now like to access 

from the admin interface. As per instructions  I found on the 

django site (Part 2 tutorial version 1.8.4) 

model

///////////////////////////////////////////////////////////////////////////////////////////////////////

class Genus(models.Model):

genus_id = models.AutoField(primary_key=True),

scientific_genus = models.CharField(max_length=32),

common_name = models.CharField(max_length=32),

common_examples = models.TextField(),

genus_choices = (

('Member Banana...','Musa'),

('Mango...','Magnifera'),

('Avocado...','Persea Americana'),

('Soursop, Custard, Sugar Apple...','Annona Reticulata'),

('Ginger, Tumeric ...','Zingiber Officinale Roscoe'),

('Persimmon....','Diospyros'),

('Breadfruit...','Artocarpus Altilis'),

('Cherry ...','Prunus'),

('Grapes ...','Vitis'), 

('Tomato ...','Lycopersicon'), 

('EggPlant ...','????????'), 

('Onion, Garlic ...','Allium'),

('Cashew ...','Anacardium'),

('Rice ...','Oryza'),

('Pepper ...','Capsicum'),

('Orange,Lemon, Lime ....','Citrus')

),

image_url = models.CharField(max_length=128),

genus = models.CharField(max_length=32,choices=genus_choices),

description = models.TextField()

I edit  "admin.py"  so that it now looks like

admin.py

//////////////////////////////////////////////////////////////////////////////////////////////////

from django.contrib import admin

from cfxBase.models import Genus

# Register your models here.

class GenusAdmin(admin.ModelAdmin):

    fields = [

               'genus',

               'scientific_genus',

               'common_name',

               'description',

               'common_examples',

               'image_url'

    ]

    

admin.site.register(Genus, GenusAdmin)

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Now when I attempt the admin page add entry  for Genus I am getting this 

error:

FieldError at /admin/cfxBase/genus/add/

Unknown field(s) (scientific_genus, genus, common_name, common_examples, 

                  description, image_url) specified for Genus. 

Check fields/fieldsets/exclude attributes of class GenusAdmi

Your help will be  greatly appreciated

[Gergely Polonkai]

Hello,

I suspect you didn't make/run migrations:

python manage.py makemigrations
python manage.py migrate

The first command creat the so-called migration files that are required to update the database by adding new tables and fields, while the second one does the actual upgrade.

Also, allow me some comments.

You may want to omit genus_id from your model, as it gets created automatically anyway. One field less to manage while you write your code. Of course, it's up to you.

The second one is your choice field. By convention, Django people do it this way:

EXAMPLE_CHOICES = (
    ('short code to store in DB', 'long text to display'),
    …
)
field = models.CharField(choices=EXAMPLE_CHOICES)

My main point here other than conventions is that "short code" won't get displayed for the user, so make your choice list based on this.

Third, eggplant is Solanum if I recall well :)

Best,
Gergely

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[Rolston Jeremiah]

Hello Polonkai,

Much thanks for responding to my cry for help!  I will make the
suggested changes and correctionns. Thanks much.


Actually, I did adhere  to Django's typical  workflow as you hinted to:

        python manage.py  makemigrations
        python manage.py migrate

But when I examined the 0001_initial.py file in the migrations folder:



from django.db import models, migrations


class Migration(migrations.Migration):

    dependencies = [
    ]

    operations = [
        migrations.CreateModel(
            name='ActiveContracts',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='AddressBook',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='Agents',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='ArchivedContracts',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='Genus',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='ManagementUnits',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='ProductionUnits',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='Products',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
            ],
        ),
        migrations.CreateModel(
            name='SoilProfiles',
            fields=[
                ('id', models.AutoField(serialize=False, verbose_name='ID', primary_key=True, auto_created=True)),
                ('comment', models.TextField(default='Not provided')),
            ],
        ),
    ]

ONLY the id field is being auto-generated. As my-level of Django skiils I am not
sure how identify the source of the problem. The models have correct names
so manage.py is "model-aware (assume correct env setup)". I was looking
here (https://realpython.com/blog/python/digging-deeper-into-migrations)  for more info on
migration and was considering to  edit  migration file to setup the database tables. BUT
I AM NOT CLEAR ON THE IMPLICATIONS GOING FORWARD FOR ADMIN INTERFACE
and so. I shall see where  this path leads to - hopefully a solution and a deeper understanding of
the Django framework.

Rjae
regards

[Florian Schweikert]

On 29/09/15 18:47, Rolston Jeremiah wrote:
> class Genus(models.Model):
> genus_id = models.AutoField(primary_key=True),
> scientific_genus = models.CharField(max_length=32),
> common_name = models.CharField(max_length=32),
> common_examples = models.TextField(),

It's probably because of the ',' at each line end.
I think genus_id became a tuple of fields, remove them and try again :)

--
Florian

[Rolston Jeremiah]

Hello Florian Schweikert,

Thank you. The  commas (',')   were the problem. Consider this user-issue closed.
Great place to learn

Thanks to  all.
Rjae

On Monday, September 28, 2015 at 6:56:42 PM UTC-4, Rolston Jeremiah wrote: