Can you explain what GORM relationships are in Go?
GORM relationships define how different models interact with each other in a database. They include one-to-one, one-to-many, and many-to-many relationships.
How do I set up a one-to-many relationship in GORM?
To set up a one-to-many relationship, you can define a foreign key in the child model that references the parent model. For example, if you have a User
and Post
model, the Post
model would have a UserID
field.
Can you show me a code example for that?
Sure! Here's a simple example:
type User struct {
ID uint `gorm:"primaryKey"`
Name string
Posts []Post `gorm:"foreignKey:UserID"`
}
type Post struct {
ID uint `gorm:"primaryKey"`
Title string
UserID uint
}
This sets up a one-to-many relationship where a user can have multiple posts.
What about many-to-many relationships?
For many-to-many relationships, you need a join table. For example, if you have Student
and Course
models, you would create a StudentCourse
join table to link them.
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