Django ORM Ninja: Advanced Techniques for Developers

Kursinnehåll

Django ORM Ninja: Advanced Techniques for Developers

Django ORM Ninja: Advanced Techniques for Developers

1. Introduction to Django ORM

Introduction to the Course Introduction to the ORM Start a New Project Initialize a New Project

2. Models, datatypes, and fields

Defining The First Model Field Data Types Define Other Models Migrations Admin Interface

3. Queries

Create Query Retrieve Query Lazy Queries Ordering and Slicing Updating Deleting

4. Relations

Many-to-One ForeignKey Arguments One-to-One Many-to-Many

5. Complex Queries

Field Lookups Q and F Objects Aggregations Annotations Minimazing Database Hints

6. Advanced

Class Meta Constrains Transactions Basics User Model

Many-to-One

A relational database is named for its structure, which includes relationships between different tables. The most common type is the Many-to-One relationship. For instance, a single reporter can write many articles, but each article has only one reporter. Similarly, a literary genre may be associated with many books, but each book belongs to only one genre.

Let's define this relationship between Book and Genre in Django models:

A ForeignKey field type links linking Book to the Genre model. This creates the Many-to-One relationship, where each book is related to one genre. The on_delete=models.CASCADE argument means that if a genre is deleted, all books in that genre will also be deleted.

1. In Django, how is a Many-to-One relationship defined between two models?

2. If a 'Book' model has a 'ForeignKey' linked to a 'Genre' model, what does this indicate about their relationship?

In Django, how is a Many-to-One relationship defined between two models?

Select the correct answer

Using the ManyToOneField

Using the ManyToManyField(unique=True)

Using the ForeignKey

Using the CharField

If a 'Book' model has a 'ForeignKey' linked to a 'Genre' model, what does this indicate about their relationship?

Select the correct answer

Each genre can be associated with many books.

Each book can be associated with many genres.

There is a one-to-one relationship between a book and a genre.

The relationship is purely decorative and has no real database significance.

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 4. Kapitel 1

Fråga AI

Fråga AI

Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal

Kursinnehåll

Django ORM Ninja: Advanced Techniques for Developers

Django ORM Ninja: Advanced Techniques for Developers

1. Introduction to Django ORM

Introduction to the Course Introduction to the ORM Start a New Project Initialize a New Project

2. Models, datatypes, and fields

Defining The First Model Field Data Types Define Other Models Migrations Admin Interface

3. Queries

Create Query Retrieve Query Lazy Queries Ordering and Slicing Updating Deleting

4. Relations

Many-to-One ForeignKey Arguments One-to-One Many-to-Many

5. Complex Queries

Field Lookups Q and F Objects Aggregations Annotations Minimazing Database Hints

6. Advanced

Class Meta Constrains Transactions Basics User Model

Many-to-One

A relational database is named for its structure, which includes relationships between different tables. The most common type is the Many-to-One relationship. For instance, a single reporter can write many articles, but each article has only one reporter. Similarly, a literary genre may be associated with many books, but each book belongs to only one genre.

Let's define this relationship between Book and Genre in Django models:

A ForeignKey field type links linking Book to the Genre model. This creates the Many-to-One relationship, where each book is related to one genre. The on_delete=models.CASCADE argument means that if a genre is deleted, all books in that genre will also be deleted.

1. In Django, how is a Many-to-One relationship defined between two models?

2. If a 'Book' model has a 'ForeignKey' linked to a 'Genre' model, what does this indicate about their relationship?

In Django, how is a Many-to-One relationship defined between two models?

Select the correct answer

Using the ManyToOneField

Using the ManyToManyField(unique=True)

Using the ForeignKey

Using the CharField

If a 'Book' model has a 'ForeignKey' linked to a 'Genre' model, what does this indicate about their relationship?

Select the correct answer

Each genre can be associated with many books.

Each book can be associated with many genres.

There is a one-to-one relationship between a book and a genre.

The relationship is purely decorative and has no real database significance.

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 4. Kapitel 1

some-alt