NameError at /admin/ name 'HoleImage' is not defined

[Patrick C]

Hi All,

New to Django / Python (coming from PHP).

Trying to make a site for a golf course where there is a hole by hole guide, each hole has a number, name, description then multiple images for the gallery.

I've spend the last few hours googling how I'm going wrong here because I get the error in the subject line.

My models.py is:

from django.db import models

class Hole(models.Model):

    hole_number = models.IntegerField()

    hole_name = models.CharField(max_length=255)

    hole_description = models.CharField(max_length=500)

    def __str__(self):

    return self.hole_number

class HoleImage(models.Model):

    hole = models.ForeignKey(Hole, related_name='images')

    image = models.ImageField(upload_to='hole_photos')

    caption = models.CharField(max_length=250)

and my admin.py is:

from django.contrib import admin

from holes.models import Hole

class HoleImageInline(admin.TabularInline):

    model = HoleImage

class HoleAdmin(admin.ModelAdmin):

    fields = ['hole_number', 'hole_name', 'hole_description']

    list_display = ['hole_number', 'hole_name', 'hole_description']

    inlines = [ HoleImageInline, ]

admin.site.register(Hole)

Full admin panel error is:

NameError at /admin/

name 'HoleImage' is not defined

Request Method:	GET
Request URL:	http://127.0.0.1:8000/admin/
Django Version:	1.6.5
Exception Type:	NameError
Exception Value:	name 'HoleImage' is not defined
Exception Location:	/Users/my_laptop/development/golfsmart/holes/admin.py in HoleImageInline, line 5
Python Executable:	/usr/bin/python
Python Version:	2.7.5

As I say, I'm new to this and have had a good trial and error stab, I'm sure it's something simple I am overlooking and once I have it resolved I will have a lesson learned as I have a few other apps to setup that will use this many type for images.

Thanks in advance.

[Ilya Kazakevich]

To use any symbol (including " HoleImage" class) you need to import it first.
You've imported Hole (from holes.models import Hole), but you forgot to import HoleImage.
So, you got " name 'HoleImage' is not defined " error.

It is better to use IDE, because it helps you in such cases :)




Ilya Kazakevich,
JetBrains PyCharm (Best Python/Django IDE)
http://www.jetbrains.com/pycharm/
"Develop with pleasure!"

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[Jorge Andrés Vergara Ebratt]

You need to import HoleImage in admin.py

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[Patrick C]

Hi Ilya,

Thanks for the swift reply, sorry for the noob question but can you elaborate on "but you forgot to import HoleImage" - I'm not quite following, I'm sure I will understand it once explained.

I'm only about 4 hours into my first workings with Python / Django, perhaps I'm jumping in a little too quick but so far I have read through a fair bit and live the prose. 

[Jorge Andrés Vergara Ebratt]

In admin.py you have

from hotels.models import Hole

Add HoleImage to that import

On Jun 11, 2014 3:19 PM, "Patrick C" <patrick....@gmail.com> wrote:

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[Patrick C]

Hi Jorge,

Thanks for helping out - I understand that and have just tried it but still get the error:

NameError at /admin/

name 'Hole' is not defined

Request Method:	GET
Request URL:	http://127.0.0.1:8000/admin/
Django Version:	1.6.5
Exception Type:	NameError

Exception Value:	name 'Hole' is not defined
Exception Location:	/Users/my_laptop/development/golfsmart/holes/admin.py in <module>, line 12

Python Executable:	/usr/bin/python
Python Version:	2.7.5

So just to clarify my structure incase I'm missing something on pluralisation:

holes

- admin.py

- model.py

models.py:

from django.db import models

class Hole(models.Model):

    hole_number = models.IntegerField()

    hole_name = models.CharField(max_length=255)

    hole_description = models.CharField(max_length=500)

    def __str__(self):

    return self.hole_number

class HoleImage(models.Model):

    hole = models.ForeignKey(Hole, related_name='images')

    image = models.ImageField(upload_to='hole_photos')

    caption = models.CharField(max_length=250)

admin.py:

from django.contrib import admin

from holes.models import HoleImage

class HoleImageInline(admin.TabularInline):

    model = HoleImage

class HoleAdmin(admin.ModelAdmin):

    fields = ['hole_number', 'hole_name', 'hole_description']

    list_display = ['hole_number', 'hole_name', 'hole_description']

    inlines = [ HoleImageInline, ]

admin.site.register(Hole)

[Ilya Kazakevich]

Hello,

I believe you should start with Python tutorial: https://docs.python.org/2/tutorial/
After you complete it, you may go to Django tutorial.

It is generally a good idea to study basic language concepts, syntax and standard library before studying any framework (you've learned PHP _before_ zend/phpcacke/joomla or wordpress, right?:) )

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[Jorge Andrés Vergara Ebratt]

Oh and in the last line, admin.site.register, use the model you want to register in the Admin

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[Jorge Andrés Vergara Ebratt]

When you import HoleImage don't remove Hole :)

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[Patrick C]

Should it be this:

from django.contrib import admin

from holes.models import HoleImage

class HoleImageInline(admin.TabularInline):

    model = HoleImage

class HoleAdmin(admin.ModelAdmin):

    fields = ['hole_number', 'hole_name', 'hole_description']

    list_display = ['hole_number', 'hole_name', 'hole_description']

    inlines = [ HoleImageInline, ]

admin.site.register(Hole)

admin.site.register(HoleImage)

or this:

from django.contrib import admin

from holes.models import HoleImage

class HoleImageInline(admin.TabularInline):

    model = HoleImage

class HoleAdmin(admin.ModelAdmin):

    fields = ['hole_number', 'hole_name', 'hole_description']

    list_display = ['hole_number', 'hole_name', 'hole_description']

    inlines = [ HoleImageInline, ]

admin.site.register(Hole, HoleImages)

Still have errors trying either, sorry again for noob questions. 

[Patrick C]

Thanks Ilya,

I will go through that this evening - I tend to learn through hardship, banging my head off the wall, walking away and finding a moment of clarity, I'm quick to understand the logic and approach but I leant the language / syntax through repetition. 

[Ilya Kazakevich]

Instead of
from holes.models import HoleImage
write
from holes.models import HoleImage, Hole

Please read https://docs.python.org/2/tutorial/modules.html

Ilya Kazakevich,
JetBrains PyCharm (Best Python/Django IDE)
http://www.jetbrains.com/pycharm/
"Develop with pleasure!"


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[Patrick C]

Understood, got that error cleared now.

Just a last question - should my HoleImages not present their upload options in the Hole part of the admin?