Clean Arch

entity.go

package user

import "github.com/jinzhu/gorm"

type User struct {
	gorm.Model
	FirstName   string `json:"first_name,omitempty"`
	LastName    string `json:"last_name,omitempty"`
	Password    string `json:"password,omitempty"`
	PhoneNumber string `json:"phone_number,omitempty"`
	Email       string `json:"email,omitempty"`
	Address     string `json:"address,omitempty"`
	DisplayPic  string `json:"display_pic,omitempty"`
}

Isn’t password is implementation specific?
If you wanna use Login with Google you would need to change your entity that need to be independent

Another thing is that the json path or whatever it is (I’m sorry I don’t know Go) is also implementation specific
(entity shouldn’t import libraries, if you want to change your library you would need to change your business core)

json tag is actually an idiomatic way to represent what the names of the fields will be when this structure is encoded into JSON. It is not a path. Your conjecture about the password field is right, I just store the OAuth access token in the password field when doing Google login, since we have to explicitly serialize them anyway. I would love to know about your approach for the same.