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Django ORM Ninja: Advanced Techniques for Developers

Create QueryCreate Query

We are already familiar with one type of query – it's the query that retrieves all instances from a single table:

where Author is our model representing the database table, objects is Django's default manager that facilitates query operations, and all() is a method that retrieves all instances from the 'Author' table, akin to the SQL command SELECT * FROM Author. This QuerySet will be used to check the results of our CREATE operations.

If you work inside IDE, you can repeat all these commands in the Python environment activated in the terminal. Write:

Initially, our Author table is empty. Let's add some entries. In Django, we can conveniently create and save a new instance to the database using the create() method:

This single line both creates and saves a new Author object.

After running this, if we execute Author.objects.all(), we'll now see a QuerySet containing our new author.

Let's add two more authors:

Each create() call instantly persists these new instances to the database.

Now, Author.objects.all() returns a list with three instances, reflecting our newly created authors in the database.

1. What does the Django command 'Author.objects.all()' do?
2. In Django, what is 'objects' in 'Author.objects.all()'?
3. What is the result of executing Author.objects.create(first_name="Ronald", last_name="Tolkien")?

What does the Django command 'Author.objects.all()' do?

Select the correct answer

In Django, what is 'objects' in 'Author.objects.all()'?

Select the correct answer

What is the result of executing Author.objects.create(first_name="Ronald", last_name="Tolkien")?

Select the correct answer

Everything was clear?

Section 3. Chapter 1
course content

Course Content

Django ORM Ninja: Advanced Techniques for Developers

1. Introduction to Django ORM

Introduction to the CourseIntroduction to the ORMStart a New ProjectInitialize a New Project

2. Models, datatypes, and fields

Defining The First ModelField Data TypesDefine Other ModelsMigrationsAdmin Interface

3. Queries

Create QueryRetrieve QueryLazy QueriesOrdering and SlicingUpdatingDeleting

4. Relations

Many-to-OneForeignKey ArgumentsOne-to-OneMany-to-Many

5. Complex Queries

Field LookupsQ and F ObjectsAggregationsAnnotationsMinimazing Database Hints

6. Advanced

Class MetaConstrainsTransactions BasicsUser Model

Django ORM Ninja: Advanced Techniques for Developers

Create QueryCreate Query

We are already familiar with one type of query – it's the query that retrieves all instances from a single table:

where Author is our model representing the database table, objects is Django's default manager that facilitates query operations, and all() is a method that retrieves all instances from the 'Author' table, akin to the SQL command SELECT * FROM Author. This QuerySet will be used to check the results of our CREATE operations.

If you work inside IDE, you can repeat all these commands in the Python environment activated in the terminal. Write:

Initially, our Author table is empty. Let's add some entries. In Django, we can conveniently create and save a new instance to the database using the create() method:

This single line both creates and saves a new Author object.

After running this, if we execute Author.objects.all(), we'll now see a QuerySet containing our new author.

Let's add two more authors:

Each create() call instantly persists these new instances to the database.

Now, Author.objects.all() returns a list with three instances, reflecting our newly created authors in the database.

1. What does the Django command 'Author.objects.all()' do?
2. In Django, what is 'objects' in 'Author.objects.all()'?
3. What is the result of executing Author.objects.create(first_name="Ronald", last_name="Tolkien")?

What does the Django command 'Author.objects.all()' do?

Select the correct answer

In Django, what is 'objects' in 'Author.objects.all()'?

Select the correct answer

What is the result of executing Author.objects.create(first_name="Ronald", last_name="Tolkien")?

Select the correct answer

Everything was clear?

Section 3. Chapter 1
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