Django | Migrar SQLite y postgres

gistfile1.md

**Step 1:

Make a backup of your project (It does not hurt to prevent any eventuality)

**Step 2:

Run a data export. Directly Django provides the mechanism. The method that did not give me problems was the following:

python manage.py dumpdata --natural-foreign --natural-primary --format = xml --indent = 2> fixture.xml

The use of the XML file and the --natural-foreign --natural-primary flags was the difference between the failure and the success of the operation. If you omit these flags you could get a lot of errors in the console.

**Step 3:

Remember to install the Postgress dependency so that Django can work with this database engine:

pip install psycopg2

**Step 4:

Change your database connection from SQLite to postgress in your settings.py file. It could be something like the following:

default ': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'dbname',
        'USER': 'dbuser',
        'PASSWORD': 'dbpassword',
        'HOST': 'localhost',
        'PORT': '5432',
    }

** Step 5:

Delete all migration files. That is, everything that is inside the my_module / migrations folder. It is important not to delete the init.py file

This must be repeated in each module of your app that contains potential migrations.

** Step 6:

Run the build of migrations and then migrate to configure your Postgress database. In this way it will be a valid template to contain the data that you will import later:

python manage.py makemigrations
python manage.py migrate

** Step 7:

Load the data into your new postgress database with the following command:

 python manage.py loaddata fixture.xml

You can now test your app with this database.