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 <atsun...@umich.edu 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
>
>
>
>
>
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> .
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>
On Wed, Feb 6, 2019, 8:03 AM Atsunori Kaneshige <atsun...@umich.edu 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 django-users+unsubscr...@googlegroups.com.
> To post to this group, send email to django-users@googlegroups.com.
> 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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