django.db.utils.ProgrammingError: can't adapt type 'dict' after I tried to add a Hstorefield to my model - migrate

Question

I am developing an app in Django.
I tried to add a Hstorefield to my model, then I deleted it, and now I cannot anymore run the command manage.py makemigrations because I always get this error
(met5) C:\Users\Tommaso\Django rest framework\Udemy Django\Metaglossario_Gestisco>python manage.py migrate Operations to perform: Apply all migrations: admin, app_metaglossario, auth, contenttypes, sessions Running migrations: Applying app_metaglossario.0045_model_node_data...Traceback (most recent call last): File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) psycopg2.ProgrammingError: can't adapt type 'dict'
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "manage.py", line 21, in <module>
main() File "manage.py", line 17, in main
execute_from_command_line(sys.argv) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute() File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
fake_initial=fake_initial, File "C:\Applicazioni_Tommaso\Phyton\lib\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 "C:\Applicazioni_Tommaso\Phyton\lib\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 "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\operations\fields.py", line 112, in database_forwards
field, File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\base\schema.py", line 447, in add_field
self.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
cursor.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 99, in execute
return super().execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) django.db.utils.ProgrammingError: can't adapt type 'dict'
(met5) C:\Users\Tommaso\Django rest framework\Udemy Django\Metaglossario_Gestisco>python manage.py makemigrations Migrations for 'app_metaglossario': app_metaglossario\migrations\0054_model_node.py
- Create model model_node
(met5) C:\Users\Tommaso\Django rest framework\Udemy Django\Metaglossario_Gestisco>python manage.py migrate Operations to perform: Apply all migrations: admin, app_metaglossario, auth, contenttypes, sessions Running migrations: Applying app_metaglossario.0045_model_node_data...Traceback (most recent call last): File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) psycopg2.ProgrammingError: can't adapt type 'dict'
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File "manage.py", line 21, in <module>
main() File "manage.py", line 17, in main
execute_from_command_line(sys.argv) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute() File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
fake_initial=fake_initial, File "C:\Applicazioni_Tommaso\Phyton\lib\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 "C:\Applicazioni_Tommaso\Phyton\lib\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 "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\migrations\operations\fields.py", line 112, in database_forwards
field, File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\base\schema.py", line 447, in add_field
self.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
cursor.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 99, in execute
return super().execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Applicazioni_Tommaso\Phyton\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params) django.db.utils.ProgrammingError: can't adapt type 'dict'
It looks like that Hstorefiels is still having some effects on my database.
I tried to empty the model in which I pu the Hstorefield, then delete it, but nothing.
I even reset my database from Heroku, but the error keeps popping up.
How can I get rid of it?

Answer 1

Read the Django documentation for 2.0 or above, it is clearly stated that You need to Setup the hstore extension in PostgreSQL. I was also getting the same error, to solve this try this:
sudo su - postgres //switch to postgres user
\c database; //connect your database
CREATE EXTENSION IF NOT EXISTS hstore; //create extension

Answer 2

Follow these steps to get it working
In your settings add the django.contrib.postgres as part of the installed apps.
create a migration before the migration that used the hstore field and Copy and paste the code below in the migration file.
from django.db import models, migrations
from django.contrib.postgres.operations import HStoreExtension, UnaccentExtension
class Migration(migrations.Migration):
dependencies = [
('main', '0001_initial'),
]
operations = [
HStoreExtension(),
UnaccentExtension()
]
Create the migration that adds the hstore fields.
Run migration.
This worked for me!