(Initially asked in SO - I will synchronize answers if any)

Your Question

I am new to ORM (and GORM) so apologies if this is an obvious question, but it does not seem to be covered by the documentation.

I will be using the examples from the documentation as a base to my questions

Question 1: Belongs To

// `User` belongs to `Company`, `CompanyID` is the foreign key
type User struct {
  gorm.Model
  Name      string
  CompanyID int
  Company   Company
}

type Company struct {
  ID   int
  Name string
}
  • A User belongs to one Company only → this is handled by the code above
  • A Company has many User → is this implied by the code above? Or should I add somehow a relation O2M in Company?

Question 2: Has Many

// User has many CreditCards, UserID is the foreign key
type User struct {
  gorm.Model
  CreditCards []CreditCard
}

type CreditCard struct {
  gorm.Model
  Number string
  UserID uint
}
  • A User has 1+ CreditCard→ this is handled by the code
  • A CreditCard can belong to several users (say, a shared family CC) → is it implied? (if not: how to set up the O2M relationship).
    Or is it, instead, a case where a CreditCard is explicitly configured to belong to only one user?

The document you expected this should be explained

An addition about the symmetrical to each relationship description in the documentation

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