Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.
One-to-One Relationship | Database and Models
Professional Web API with Flask
course content

Course Content

Professional Web API with Flask

Professional Web API with Flask

1. Introduction to the Course
2. Database and Models
3. Flask-Smorest and Schemas
4. Endpoints with Blueprints and MethodView
5. Authentication with JWT
6. Deployment

bookOne-to-One Relationship

In this chapter, we explore the concept of One-to-One relationships between database models using SQLAlchemy, a feature that, while not utilized in our current project, is crucial for certain application requirements. This type of relationship is particularly useful when you want to link two models together, such as linking a Profile with a User or a Badge with a Worker. The implementation is straightforward, requiring a simple adjustment in the model definitions.

Implementing One-to-One Relationships

To achieve a one-to-one relationship, we use the uselist=False argument within the db.relationship field in each model. This ensures that the relationship is treated as a single entity rather than a list of entities, which is the default behavior for one-to-many relationships.

Example: Profile and User Models

Here's an example demonstrating how to define a one-to-one relationship between a User and a Profile:

In this example, each User can have no more than one Profile, and vice versa. The use of uselist=False in the relationship ensures that the link between the User and Profile is one-to-one. This setup is ideal for cases where a direct and exclusive association between two entities is required.

1. In Flask-SQLAlchemy, how do you define a one-to-one relationship?
2. What is a primary characteristic of a one-to-one relationship in a database model?
3. When designing a one-to-one relationship, what is a common use case scenario?
In Flask-SQLAlchemy, how do you define a one-to-one relationship?

In Flask-SQLAlchemy, how do you define a one-to-one relationship?

Select the correct answer

What is a primary characteristic of a one-to-one relationship in a database model?

What is a primary characteristic of a one-to-one relationship in a database model?

Select the correct answer

When designing a one-to-one relationship, what is a common use case scenario?

When designing a one-to-one relationship, what is a common use case scenario?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 4
some-alt