How Many Types Of Relationships Does A Model Has?

In Ruby on Rails, models can have four main types of relationships:

1. One-to-One Relationship
2. One-to-Many Relationship
3. Many-to-Many Relationship
4. Self-Referential Relationship

Let's discuss each type in detail:

1. One-to-One Relationship

In a one-to-one relationship, one instance of a model is associated with one instance of another model, and vice versa. This relationship is useful when you have two models that are closely related and share a one-to-one correspondence. For example, a User model might have a one-to-one relationship with a Profile model, where each user has exactly one profile and each profile belongs to exactly one user.

2. One-to-Many Relationship

A one-to-many relationship is the most common type of relationship in Rails. In this relationship, one instance of a model is associated with zero or more instances of another model, but each instance of the other model is associated with only one instance of the first model. For example, a Post model might have a one-to-many relationship with a Comment model, where each post can have multiple comments, but each comment belongs to only one post....