Re: Django generated migration fails with KeyError for field that was removed from the model.

My guess is that field is not empty in the database or it's being called in a view or template still. 

Sent from my mobile device

On Apr 18, 2018, at 2:59 PM, jackotonye <tonyejck@gmail.com> wrote:

A migration generated with `python manage.py makemigrations` Fails to execute using `python manage.py migrate`.

Model Layout:

class Offer(BaseModel):
    client = models.ForeignKey(Client, on_delete=models.PROTECT, related_name='offers')
    amount_off = models.DecimalField(max_digits=5, decimal_places=2, default=Decimal('0.00')).  # Removed this field from the model
    

Generated Migration file:

# Generated by Django 2.0.2 on 2018-04-18 21:36

from django.db import migrations


class Migration(migrations.Migration):

    dependencies = [
        ('my_app', '0031_auto_20180418_1802'),
    ]

    operations = [
        migrations.RemoveField(
            model_name='offer',
            name='amount_off',
        ),
    ]

Error:

Running migrations:

  Applying my_app.0032_auto_20180418_2136...Traceback (most recent call last):

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/models/options.py", line 566, in get_field

    return self.fields_map[field_name]

KeyError: 'amount_off'


During handling of the above exception, another exception occurred:


Traceback (most recent call last):

  File "manage.py", line 22, in <module>

    execute_from_command_line(sys.argv)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line

    utility.execute()

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/core/management/__init__.py", line 365, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/core/management/base.py", line 288, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/core/management/base.py", line 335, in execute

    output = self.handle(*args, **options)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 200, in handle

    fake_initial=fake_initial,

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/migrations/executor.py", line 117, in migrate

    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards

    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration

    state = migration.apply(state, schema_editor)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/migrations/migration.py", line 122, in apply

    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/migrations/operations/models.py", line 525, in database_forwards

    getattr(new_model._meta, self.option_name, set()),

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 342, in alter_unique_together

    self._delete_composed_index(model, fields, {'unique': True}, self.sql_delete_unique)

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 365, in _delete_composed_index

    columns = [model._meta.get_field(field).column for field in fields]

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 365, in <listcomp>

    columns = [model._meta.get_field(field).column for field in fields]

  File "/Users/myuser/.virtualenvs/my_app/lib/python3.6/site-packages/django/db/models/options.py", line 568, in get_field

    raise FieldDoesNotExist("%s has no field named '%s'" % (self.object_name, field_name))

django.core.exceptions.FieldDoesNotExist: Offer has no field named 'amount_off'

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