Hi Nitin,
Thank you for your comment.
I did not add any additional class in models.py.
I just added two fields under the same class, List.
class List(models.Model):
item = models.CharField(max_length=200)
completed = models.BooleanField(default=False)
*created_at = models.DateTimeField('date', auto_now_add=True, null =
True) *
* updated_at = models.DateTimeField('update', auto_now=True, null = True) *
In admin.py, I did not change anything.
#this is my admin.py
from django.contrib import admin
from .models import List
# Register your models here. then go to admin page and re-load
admin.site.register(List)
Why new columns (or in other words, new fields) do not show up in my admin
site? Even though I did makemigrations/migrate.
Thank you for your help!
Nori
On Tuesday, February 5, 2019 at 9:58:30 PM UTC-5, Nitin Kalmaste wrote:
>
> You need to add python's magic method in order to return something from
> the models you have created. Also you have to register your models to
> admin.py file. You can refer Django documents for that.
>
> On Wed, Feb 6, 2019, 8:03 AM Atsunori Kaneshige <[email protected]
> <javascript:> wrote:
>
>> Hi, Django masters!
>>
>> My app has simple models.py
>> just two fields like below.
>>
>> #models.py
>> class List(models.Model):
>> item = models.CharField(max_length=200)
>> completed = models.BooleanField(default=False)
>>
>> #migration 0001
>> class Migration(migrations.Migration):
>>
>> initial = True
>>
>> dependencies = [
>> ]
>>
>> operations = [
>> migrations.CreateModel(
>> name='List',
>> fields=[
>> ('id', models.AutoField(auto_created=True,
>> primary_key=True, serialize=False, verbose_name='ID')),
>> ('item', models.CharField(max_length=200)),
>> ('completed', models.BooleanField(default=False)),
>> ],
>> ),
>> ]
>>
>> and after makemigrations/migrate, the app was working no problem.
>> *Then, I wanted to try adding two more fields.*
>>
>> #new models.py
>> class List(models.Model):
>> item = models.CharField(max_length=200)
>> completed = models.BooleanField(default=False)
>> *created_at = models.DateTimeField('date', auto_now_add=True, null =
>> True) *
>> * updated_at = models.DateTimeField('update', auto_now=True, null =
>> True) *
>>
>> #migrations 0002
>> class Migration(migrations.Migration):
>>
>> dependencies = [
>> ('pages', '0001_initial'),
>> ]
>>
>> operations = [
>> migrations.AddField(
>> model_name='list',
>> name='created_at',
>> field=models.DateTimeField(auto_now_add=True, null=True,
>> verbose_name='date'),
>> ),
>> migrations.AddField(
>> model_name='list',
>> name='updated_at',
>> field=models.DateTimeField(auto_now=True, null=True,
>> verbose_name='update'),
>> ),
>> ]
>>
>>
>> Django doc says that I need to add '*null = True*' because I am using
>> postgresql as my database.
>> Without '*null = True*', the program throws an error saying that column
>> pages_list.created_at doesn't exist etc. when I try to see the web page.
>> But, with '*null = True*', I successfully did makemigration and migrate,
>> then web page showed up without any problem.
>>
>> *But, when I go to admin, I could not find any fields that I though I
>> created.*
>> I also looked at the table in my postgresql, but again, there are only
>> original columns, but not other two columns.
>>
>> Do you know how to add new columns by changing models.py??
>> What should I take care to successfully modify models and add new columns
>> in my database table (postgresql in my case).
>>
>> I really appreciate your advice!
>>
>> Looking forward to hearing from you.
>>
>> Nori
>>
>>
>>
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Django users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to [email protected] <javascript:>.
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>> <javascript:>.
>> Visit this group at https://groups.google.com/group/django-users.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/django-users/a1d71d4c-1500-4972-af57-dc23f5d1ff20%40googlegroups.com
>>
>> <https://groups.google.com/d/msgid/django-users/a1d71d4c-1500-4972-af57-dc23f5d1ff20%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
> On Wed, Feb 6, 2019, 8:03 AM Atsunori Kaneshige <[email protected]
> <javascript:> wrote:
>
>> Hi, Django masters!
>>
>> My app has simple models.py
>> just two fields like below.
>>
>> #models.py
>> class List(models.Model):
>> item = models.CharField(max_length=200)
>> completed = models.BooleanField(default=False)
>>
>> #migration 0001
>> class Migration(migrations.Migration):
>>
>> initial = True
>>
>> dependencies = [
>> ]
>>
>> operations = [
>> migrations.CreateModel(
>> name='List',
>> fields=[
>> ('id', models.AutoField(auto_created=True,
>> primary_key=True, serialize=False, verbose_name='ID')),
>> ('item', models.CharField(max_length=200)),
>> ('completed', models.BooleanField(default=False)),
>> ],
>> ),
>> ]
>>
>> and after makemigrations/migrate, the app was working no problem.
>> *Then, I wanted to try adding two more fields.*
>>
>> #new models.py
>> class List(models.Model):
>> item = models.CharField(max_length=200)
>> completed = models.BooleanField(default=False)
>> *created_at = models.DateTimeField('date', auto_now_add=True, null =
>> True) *
>> * updated_at = models.DateTimeField('update', auto_now=True, null =
>> True) *
>>
>> #migrations 0002
>> class Migration(migrations.Migration):
>>
>> dependencies = [
>> ('pages', '0001_initial'),
>> ]
>>
>> operations = [
>> migrations.AddField(
>> model_name='list',
>> name='created_at',
>> field=models.DateTimeField(auto_now_add=True, null=True,
>> verbose_name='date'),
>> ),
>> migrations.AddField(
>> model_name='list',
>> name='updated_at',
>> field=models.DateTimeField(auto_now=True, null=True,
>> verbose_name='update'),
>> ),
>> ]
>>
>>
>> Django doc says that I need to add '*null = True*' because I am using
>> postgresql as my database.
>> Without '*null = True*', the program throws an error saying that column
>> pages_list.created_at doesn't exist etc. when I try to see the web page.
>> But, with '*null = True*', I successfully did makemigration and migrate,
>> then web page showed up without any problem.
>>
>> *But, when I go to admin, I could not find any fields that I though I
>> created.*
>> I also looked at the table in my postgresql, but again, there are only
>> original columns, but not other two columns.
>>
>> Do you know how to add new columns by changing models.py??
>> What should I take care to successfully modify models and add new columns
>> in my database table (postgresql in my case).
>>
>> I really appreciate your advice!
>>
>> Looking forward to hearing from you.
>>
>> Nori
>>
>>
>>
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Django users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to [email protected] <javascript:>.
>> To post to this group, send email to [email protected]
>> <javascript:>.
>> Visit this group at https://groups.google.com/group/django-users.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/django-users/a1d71d4c-1500-4972-af57-dc23f5d1ff20%40googlegroups.com
>>
>> <https://groups.google.com/d/msgid/django-users/a1d71d4c-1500-4972-af57-dc23f5d1ff20%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>
--
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to [email protected].
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