How to access PostgreSQL database in Django application

Question

I have created a simple Django application which tries to access table named fruits present in PostgreSQL database and display its contents. I followed the official Django documentation and implemented below code as far as I understand. But below procedure is incomplete I believe as fruits.objects.all() is failing to fetch any data. I am missing something can anybody point it out any help would be appreciated.

Table: fruits

models.py

from django.db import models

class fruits(models.Model):
    ID = models.CharField(max_length=20)
    Name = models.CharField(max_length=20)

    def __str__(self):
        return self.Name

views.py

from database.models import fruits

def index(request):
    data = fruits.objects.all()

    print(len(data))

    for item in data:
        print(item)

settings.py

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': '<database_name>',
        'USER': '<user_name>',
        'PASSWORD': '<password>',
        'HOST': '<host_name>',
        'PORT': '',
    }
}

Answer 1

By default Django will create new table appname_modelname for model. So in your case this queryset fruits.objects.all() fetch data from app_fruits table, not fruits. You can specify table name using db_table meta option. For example to link model fruits with existing table fruits add following Meta to the model:

class fruits(models.Model):
    ID = models.IntegerField(max_length=20)
    Name = models.CharField(max_length=20)

    class Meta:
        db_table = 'fruits'

    def __str__(self):
        return self.Name

UPD

Django expect id field to be primary key by default not ID, to change this add primary_key option to ID field:

ID = models.IntegerField(max_length=20, primary_key=True)