Meta Class

Hi Sahar

I'm not sure if your question is related to django and python but I explain it with respect to django.

In django models we use a Meta class to provide additional info about the model that we are working with. Keep in mind that this is not the same as Python's metaclass.

Lets look at an example:

Class Book(models.Model):
    name = models.CharField(max_length=100)
    author = models.CharField(max_length=100)

    class Meta:
        ordering = ["author"]
        verbose_name_plural = "authors"

Here basically when a query is returned will be ordered by the author. In the next statement, we are stating what the plural form of author should be.

There are many other meta options available where you can find them in django docs. https://docs.djangoproject.com/en/dev/topics/db/models/

According to the docs "Model metadata is “anything that’s not a field”, such as ordering options (ordering), database table name (db_table), or human-readable singular and plural names (verbose_name and verbose_name_plural). None are required, and adding class Meta to a model is completely optional."

Hope it helps.

Hello, Sahar Nasiri what is it for? it's tell the Model what Database is belongs to We do that, by defining a class called Meta (this is just a class that called meta) inside of our Entry class in this case, (you can have classes inside of classes.) and it have one attribute which is 'database', because we're going to set database as being equal to 'db' which is our SQLite database we created up on line above.

I hope this helps clear it up. :)

You might want to review the Modeling video from the previous section. At around 3:50 the use of the Meta sub-class is discussed, and how it relates to Model and describes attributes of the class it belongs to. It's not used to instantiate objects.